A slight difference between the measured temperatures is completely normal. It derives from the intrinsic error of measurement that applies to the devices. However, if the difference exceeds 10–15 °C (50-59 °F) degrees, you should check the temperature sensor and the sauna thermometer. Check the following:

• Are the temperature sensor and sauna thermometer placed in different locations in the steam room where the temperatures actually differ?
• Is the temperature sensor too close to the sauna heater? Is it too close to the door? The best location for the temperature sensor is the opposite wall of the sauna heater, approximately 15 cm (5,9 in) from the ceiling. It should not be placed close to vents or windows.
• Is the sauna thermometer functioning properly?

If none of the causes described above apply, and the following problems persist, the fault likely resides in the temperature sensor and it requires replacing:

• the temperature difference exceeds 20 ° (68 °F) degrees
• the temperature displayed on the screen of the sauna controller changes abruptly or fluctuates constantly
• The message “Temperature input error” is displayed on the screen of the sauna controller

The cable might also cause these problems. Take down the sensor and try connecting it to the main module with another suitable cable. If the sensor starts functioning properly, you’ll just need to replace the cable.

In most cases, this happens when the cables of the sauna controller are not connected correctly. Only a certified electrician may connect the cables. Check the following to detect the reason of the fault:

• Are all cables connected to the main module in compliance with the diagram presented in the installation manual of UKU sauna control system? Manual: HUUM UKU Manual US
• Has a cable detached from the controller?

• If the controller of the UKU WiFi sauna control system does not establish a network connection, save a screenshot of the error log that is displayed after pressing “Connect” and email it to us at support@huumsauna.com

We’ll respond at the earliest convenience!

• Are the heating elements functioning properly? To find out, remove some stones from the sauna heater and check if the heating elements warm up after switching the heater on. If a heating element does not turn red, it is damaged and needs to be replaced before further use of the heater.
• Are the cables properly connected? Ask an electrician to disconnect the sauna heater from the power supply and to verify that all cables of the heater and the controller are connected to the main module in accordance with the user manual of the sauna heater.
• If this does not solve the problem, take a picture of the main module cabling and email it to us at support@huumsauna.com with a description of the problem.

We’ll respond at the earliest convenience!

If the HUUM electric sauna heater warms up too slowly:

• Is the power rating of the sauna heater sufficient for the size of your steam room? Check the product page or the user manual.
• Did you take the uninsulated walls and glass surfaces into account when calculating the cubic size of the steam room? Check our blog post: “Dimensioning: how to select a sauna heater with a proper power rating?“
• Are the heating elements functioning properly? To find out, remove some stones from the sauna heater and check if the heating elements warm up when the heater is switched on. If a heating element does not turn red, it is damaged and needs to be replaced before further use.
• Is there too much ventilation in the steam room?

Installation of HIVE electric sauna heater

Downloadable installation manual: HUUM HIVE Manual US

Required checkups before installation
Installation of HIVE electric sauna heater
Connecting the HIVE electric sauna heater to the power supply
Sauna stones

Installation of sauna accessories of the HIVE electric sauna heater

Installation of the safety railing of the HIVE electric sauna heater

Installation of the embedding flange of the HIVE electric sauna heater

Installation of the reflector of the HIVE electric sauna heater

Installation of the air tunnel of the HIVE electric sauna heater

Required checkups before installation

• Before installing the HIVE electric sauna heater, verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimum safety distance from the ceiling and the walls of the steam room that apply to the positioning of the electric sauna heater are presented in Table 1.

Installation of HIVE electric sauna heater

When positioning the HIVE electric sauna heater, ensure that there is safe clearance between the flammable materials and external surfaces of the heater.

• When choosing a suitable location, ensure that you can conveniently throw water on sauna stones when sitting on the sauna bench.
• Ensure that the location of the heater does not create hazardous situations during its use. Make sure that people do not have to pass too closely by the hot heater.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• Power cable inlets are located on the bottom cover of the heater.
• Mount the supplied adjustable legs (4 pcs) below the heater.

       Table 1

Connecting HIVE electric sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker are provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW (240V)RoomCircuit breaker (A)Wire size (AWG)HIVE 1212424-883 ft312-25 m330 + 3010 + 10HIVE 1515530-1060 ft315-30 m350 + 508 + 8HIVE 1816636-1236 ft318-35 m350 + 508 + 8

Table 3Power rating kW (208V)RoomCircuit breaker (A)Wire size (AWG)HIVE 129318-662 ft39-18.75 m330 + 3010 + 10HIVE 1511.25388-795 ft311-22.5 m340 + 408 + 8HIVE 1813.5477-918 ft313.5-26 m340 + 408 + 8

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board, as shown on the circuit diagram.
• Close the cover.
• Fix the cable to the output part with a cable strap.

Sauna stones

• Sauna stones with a diameter of 5–10 cm (2-4 in) are suitable for HIVE electric sauna heaters.
  It is recommendable to use round stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones and are sold in packs weighing  33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such a case it is recommended to choose stones that are specifically meant to be used in sauna heaters, and to avoid decorative stones as they may break easily.

Quantity of sauna stones

• HIVE electric sauna heater with air tunnel requires 551 lb / 250 kg of sauna stones with a diameter of 5–10 cm (2-4 in).
• Refer to information on how to arrange sauna stones correctly.

Installation of sauna accessories of HIVE electric sauna heater

Installation of the safety railing of HIVE electric sauna heater

• Attach the wooden arcs of the safety railing to the outside part of the bracket with screws.
• Install the inner part of the bracket between the upper and the subsequent wire rod of the heater.
• Put the inner and outside parts together, and fix them with a bolt and nut.
  The safety railing is assembled!
• Regular maintenance with a breathable wood preservative helps to extend the useful life of the wooden parts of the safety railing.
  Use products that are intended for the sauna!
  As a rule, it is sufficient to perform maintenance once a year, but the maintenance interval may be shortened if you use the sauna frequently.
• The safety railing of the HIVE electric sauna heater is only meant to be used with HUUM electric sauna heaters.

Installation of the embedding flange of HIVE electric sauna heater

• The embedding flange enables one to cover the rims created for mounting the heater.
• Maximum extent of embedding the heater into the subsurface is 15.7 in / 40 cm.
• Choose a suitable location for the heater and make an opening with a diameter of 27.2 / 69.2 cm.
• After mounting the heater, place the arcs around the heater to form a solid circle.
• Fix the arcs to the corners with screws.
• Attach the corners to the subsurface with screws.
  You’re ready to go!

Installation of the reflector of HIVE electric sauna heater

• Place the reflector on the collars so that the upper hook of the reflector fits over the upper collar of the heater, and the lower hook goes around the closest collar.
  Ready!
• In the case that you wish to join several reflectors together, set the external edges of the reflectors against each other, and fasten their upper and lower parts with bolts and nuts.

Installation of the air tunnel of HIVE electric sauna heater

• Install the air tunnel between the heating elements of the heater.
• Remove the cover of the air tunnel.
• Stack two layers (approximately 10 cm) of sauna rocks on the bottom of the tunnel.
• Bend the metal retainers under by 90 degrees so that they prevent the heating elements from contacting each other.
• Put the cover back on.
• The air tunnel prolongs the useful life of the heating elements and expedites the heating process.

Placement of sauna stones significantly affects the quality of the steam. In order to fill the whole space of the sauna heater properly, use smaller and larger stones.

• Sort out bigger and smaller stones

First, take all the sauna stones out of the boxes and separate the smaller stones.

• Fill the sauna heater layer by layer

Stack the sauna stones by layers – start from the bottom of the sauna heater and move towards the top. Stones should also be placed between the heating elements. If you first place sauna stones on one side only, the heating elements might deform or break. Start with bigger stones, and use smaller ones for filling the round parts of the heater and places where there is less space.

• Heating elements should not remain exposed

Leave sufficient gaps for air movement between the sauna stones, and don’t place stones too tightly around the heating elements. Ensure that the heating elements are completely covered and not visible from the exterior surface of the sauna heater. This is important as throwing water directly on the heating elements might damage them. It will also reduce the quality of the steam. Water should evaporate from the sauna stones and not from the heating elements. The top layer of sauna stones should be as dense as possible – this is where the heat arising from below accumulates.

Downloadable installation manual: HUUM HIVE Manual US

Required checkups before installation
Installation of HIVE Mini electric sauna heater
Connecting the HIVE Mini electric sauna heater to the power supply
Sauna stones

Installation of sauna accessories of the HIVE Mini electric sauna heater

Installation of the safety railing of the HIVE Mini electric sauna heater
Installation of the embedding flange of the HIVE Mini electric sauna heater
Installation of the reflector of the HIVE Mini electric sauna heater
Installation of the air tunnel of the HIVE Mini electric sauna heater

Required checkups before installation

• Before installing the HIVE Mini electric sauna heater, verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimal safety distance from the ceiling and the walls of the steam room that apply to positioning of the electric sauna heater are presented in Table 1.

Installation of the HIVE Mini electric sauna heater

When positioning the HIVE Mini electric sauna heater, ensure that there is safe clearance between flammable materials and external surfaces of the heater.

• When choosing a suitable location, ensure that you can conveniently throw water on sauna stones when sitting on the sauna bench.
• Observe that the location of the heater would not create hazardous situations during its use. Make sure that people would not have to pass too closely by the hot heater.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• Power cable inlets are located on the bottom cover of the heater.
• Mount the supplied adjustable legs (4 pcs) below the heater.

       Table 1

Connecting the HIVE Mini electric sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC-insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker are provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW

(240V)

RoomCircuit breaker

(A)

Wire size(AWG)HIVE 66176.6-317.8 ft³5-9 m³3010HIVE 99282-530 ft³8-15 m³508HIVE 1110.6353.1-706.3 ft³10-20 m³506

Table 3Power rating kW

(208V)

RoomCircuit breaker

(A)

Wire size(AWG)HIVE 64.5132-230 ft³3.75-6.5 m³3010HIVE 96.75212-388 ft³6-11 m³408HIVE 117.9265-530 ft³7.5-15 m³506

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board as shown on the circuit diagram.
• Close the cover.
• Fix the cable to the output part with a cable strap.

Sauna stones

• Sauna stones with a diameter of 2-4 in (5–10 cm) are suitable for HIVE Mini electric sauna heaters. It is recommendable to use round stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round  olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such a case it is recommended to choose stones that are specifically meant to be used in sauna heaters and to avoid decorative stones as they may break easily.

Quantity of sauna stones

• HIVE Mini electric sauna heater requires 375 lb / 170 kg of sauna stones with a diameter of 2-4 in / 5–10 cm.
• HIVE Mini electric sauna heater with air tunnel requires 309 lb / 140 kg of sauna stones with a diameter of 2-4 in / 5–10 cm.
• Refer to the information on how to arrange sauna stones correctly.

Installation of sauna accessories of HIVE Mini electric sauna heater

Installation of the safety railing of HIVE Mini electric sauna heater

• Attach the wooden arcs of the safety railing with screws to the outside part of the bracket.
• Install the inner part of the bracket between the upper and the subsequent wire rod of the heater.
• Put the inner and outside parts together, and fix them with a bolt and a nut. The safety railing is assembled!
• Regular maintenance with a breathable wood preservative helps to extend the useful life of the wooden parts of the safety railing. Use products that are intended for sauna! As a rule, it is sufficient to perform the maintenance once a year, but maintenance interval might be shortened if you use the sauna frequently.
• The safety railing of HIVE electric sauna heater is meant to be used only with HUUM electric sauna heaters.

Installation of the embedding flange of HIVE Mini electric sauna heater

• The embedding flange enables one to cover the rims created for mounting the heater.
• Maximum extent of embedding the heater into the subsurface is 88 in / 40 cm.
• Choose a suitable location for the heater and make an opening with a diameter of 22.9 in / 58.2 cm.
• After mounting the heater, place the arcs around the heater to form a solid circle.
• Fix the arcs with screws to the corners.
• Attach the corners with screws to the subsurface. You’re set to go!

Installation of the reflector of HIVE Mini electric sauna heater

• Place the reflector on the collars so that the upper hook of the reflector fits over the upper collar of the heater, and the lower hook goes around the closest collar. Ready!
• In case you wish to join several reflectors together, set the external edges of the reflectors against each other, and fasten their upper and lower parts with bolts and nuts.

Installation of the air tunnel of HIVE Mini electric sauna heater

• Install the air tunnel between the heating elements of the heater.
• Remove the cover of the air tunnel.
• Stack two layers (approximately 4-5 in) of sauna rocks on the bottom of the tunnel.
• Bend the metal retainers under 90 degrees so that they prevent the heating elements from contacting each other.
• Put the cover back on.
• The air tunnel prolongs the useful life of the heating elements and expedites the heating process.

Installation of STEEL electric sauna heater

Downloadable installation manual of STEEL electric sauna heater: HUUM STEEL Manual US

Required checkups before installation
Installation of the sauna heater
Connecting the sauna heater to the power supply
Sauna stones

Installation of sauna accessories of the STEEL electric sauna heater

Installation of the safety railing of the STEEL electric sauna heater
Installation of the embedding flange of the STEEL electric sauna heater
Installation of the reflector of the STEEL electric sauna heater

Required checkups before installation

• Verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimal safety distance from the ceiling and the walls of the steam room that apply to positioning of the electric sauna heater are presented in Table 1.

Installation of the sauna heater

When positioning the STEEL electric sauna heater, ensure that there is safe clearance between flammable materials and the external surfaces of the heater.

• When choosing the location, ensure that you can conveniently throw water on the sauna stones when sitting on the sauna bench.
• Ensure that the location of the heater does not create hazardous situations during its use. Make sure that people do not have to pass too closely by the hot heater.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• Power cable inlets are located on the bottom cover of the heater.
• STEEL 6, 9 and 11 sauna heaters are attached to the floor with the supplied brackets. Mount the bracket to the heater leg as shown below and fix it with a screw that is suitable for the floor material.

        Table 1

Connecting the sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC-insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker are provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW (240V)RoomCircuit breaker (A)Wire size (AWG)STEEL 66212-353 ft36–10 m33010STEEL 99318-530 ft39–15 m3508STEEL 1111353-600 ft310-17 m3506

Table 3Power rating kW (208V)RoomCircuit breaker (A)Wire size (AWG)STEEL 64.8160-265 ft34.5-7.5 m33010STEEL 97.1230-388 ft36.5-11 m3408STEEL 118.5265-441 ft37.5-12.5 m3506

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board as shown on the circuit diagram.
• Close the cover.
• Fix the cable in the cable clamp.

Sauna stones

• Sauna stones with a diameter of 1.2 -2 in / 3–5 cm are suitable for STEEL electric sauna heaters. It is recommendable to use round sauna stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such cases, it is recommendable to choose stones that are specifically meant to be used in sauna heaters and to avoid decorative stones as those might break easily.

Quantity of sauna stones

• STEEL electric sauna heater requires 331 lb / 150 kg of sauna stones with a diameter of 1.2-2 in / 3–5 cm.
• Refer to the information on how to arrange sauna stones correctly.

Installation of sauna accessories of STEEL electric sauna heater

Installation of the safety railing of STEEL electric sauna heater

• Attach the brackets of the safety railing with screws to the wood, but don’t tighten the internal screw for subsequent mounting steps.
• Connect the wooden profiles to form the angular guard.
• Position the safety railing on the sauna heater so that the external wall of the heater locks between the side bends of the bracket.
• Fix the guard by tightening the screws between the bracket and the wood.
• Twist the lower ends of the bracket tightly around the heater wall so that the bracket does not move. It is recommended to use tweezers when doing this. Ready!
• Regular maintenance with a breathable wood preservative helps to extend the useful life of the wooden parts of the safety railing. Use products that are intended for sauna! As a rule, it is sufficient to perform the maintenance once a year, but the maintenance interval might be shortened if you use the sauna frequently.

Installation of the embedding flange of STEEL electric sauna heater

• Prepare the opening for the embedding flange. Refer to the figure below.
• It is important to maintain inclined cuts in the corners for attaching the screws.
• Position the slats so that they fit around the opening.
• Drill screw holes with a diameter of 0.12 in / 3 mm to the central fixation points of the slats.
• Fix the slats with the supplied screws. You’re set to go!

Installation of the reflector of STEEL electric sauna heater

• Attach the reflector to the desired side of the heater so that the upper hooks of the reflector lock around the upper narrow fin of the heater. Fix the lower hooks around the closest fin. Ensure that the upper margin of the reflector and the highest rim of the heater remain level. Ready!
• Important! In the case that you also intend to use the safety railing, attach the reflector before mounting the wooden part of the safety railing.
• Important! To ensure the convenience of mounting, attach the reflector before stacking the sauna stones.

Installation of STEEL Mini electric sauna heater

Updated September 15, 2022

Downloadable installation manual of STEEL Mini electric sauna heater: HUUM STEEL Manual US

Required checkups before installation
Installation of the sauna heater
Connecting the sauna heater to the power supply
Sauna stones

Required checkups before installation

• Before installing the STEEL Mini electric sauna heater, verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimum safety distance from the ceiling and the walls of the steam room that apply to the positioning of the electric sauna heater are presented in Table 1.

Installation of the sauna heater

When positioning the heater, ensure that there is a safe clearance between flammable materials and the external surfaces of the heater.

• STEEL Mini electric sauna heater must be mounted to the wall. When choosing a suitable location, ensure that you can conveniently throw water on the sauna stones when sitting on the sauna bench.
• Ensure that the location of the heater does not create hazardous situations during its use. Make sure that people would not have to pass too closely by the hot heater.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• Power cable inlets are located on the bottom cover of the heater.
• STEEL Mini 4 is attached to the wall with a special bracket. Fix the bracket with 4 screws to the wall as shown below and attach the sauna heater to the bracket.

Table 1

Connecting the sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC-insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker are provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW(240 V)RoomCircuit breaker (A)Wire sizeAWGSTEEL  Mini 44124-212 ft³3,5-6 m³2012

Table 2Power rating kW(208 V)RoomCircuit breaker (A)Wire sizeAWGSTEEL  Mini 42.85106-160 ft³3-4.5 m³2012

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board as shown on the circuit diagram.
• Close the cover.
• Fix the cable in the cable clamp.

Sauna stones

• Sauna stones with a diameter of 1.2 -2 in / 3–5 cm are suitable for STEEL Mini electric sauna heaters. It is recommendable to use round sauna stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such a case it is recommended to choose stones that are specifically meant to be used in sauna heaters and to avoid decorative stones as they may break easily.

Quantity of sauna stones

• STEEL Mini electric sauna heater requires 132 lb / 60 kg of sauna stones with a diameter of 1.2 – 2 in / 3–5 cm.
• Refer to the information on how to arrange sauna stones correctly.

Installation of CLIFF electric sauna heater

Downloadable installation manual: HUUM CLIFF Manual US

Required checkups before installation
Installation of CLIFF electric sauna heater
Connecting the CLIFF electric sauna heater to the power supply
Disassembling the CLIFF electric sauna heater fins for stacking sauna stones
Sauna stones

Installation of sauna accessories of the CLIFF electric sauna heater

Installation of the safety railing of the CLIFF electric sauna heater
Installation of the embedding flange of the CLIFF electric sauna heater
Installation of the reflector of the CLIFF electric sauna heater

Required checkups before installation

• Before installing the CLIFF electric sauna heater, verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimum safety distance from the ceiling and the walls of the steam room that apply to the positioning of the electric sauna heater are presented in Table 1.

Installation of CLIFF electric sauna heater

When positioning the heater, ensure that there is a safe clearance between flammable materials and the external surfaces of the heater.

• When choosing a suitable location, ensure that you can conveniently throw water on sauna stones when sitting on the sauna bench.
• Observe that the location of the heater would not create hazardous situations during its use. Make sure that people would not have to pass too closely by the hot heater.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• Power cable inlets are located on the bottom cover of the heater.
• CLIFF 6, 9 and 11 sauna heaters are attached to the floor with the supplied brackets. Mount the bracket to the heater leg as shown on the figure below and fix it with a screw that is suitable for the floor material.

Table 1

Connecting CLIFF electric sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker are provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW (240V)RoomCircuit breaker (A)Wire size (AWG)CLIFF 66176.5-353 ft³5–10 m³3010CLIFF 99318-530 ft³9–15 m³508CLIFF 1111353-600 ft³10-17 m³506

Table 3Power rating kW (208V)RoomCircuit breaker (A)Wire size (AWG)CLIFF 64.8160-265 ft34.5-7.5 m33010CLIFF 97.1230-388 ft36.5-11 m3408CLIFF 118.5265-441 ft37.5-12.5 m3506

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board, as shown on the circuit diagram.
• Close the cover.
• Fix the cable in the cable clamp.

Disassembling CLIFF electric sauna heater fins for stacking sauna stones

CLIFF electric sauna heater is narrow and tall. Therefore, it is easier to lay the sauna rocks when the fins of the heater are removed. You can do it with 2 blocks  that are supplied with the heater.

Refer to the figure below and follow these instructions:

1. Loosen the nuts of the threaded rod on the bottom of the heater by 0.11 in / 5 mm.

2. Push both props between the fins of the heater.

3. The fin is released from both sides.

4. Remove the fin carefully from the joints, first from the right end and then from the left end.

Important! Pull the fin away from the heater straight, and without turning the fin or using force – this enables one to avoid bending the tenons.

• Repeat the same steps for disassembling the fin that is located under the removed fin.

Replace the fins by following the provided instructions in reverse order. The fin must be attached to the joint first from the left end and then from the right end.

Sauna stones

• Sauna stones with a diameter of 1.2-2 in / 3–5 cm are suitable for CLIFF electric sauna heaters. It is recommendable to use round sauna stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such case, it is recommendable to choose stones that are specifically meant to be used in sauna heaters and to avoid decorative stones as those might break easily.

Quantity of sauna stones

• CLIFF electric sauna heater requires 165 lb / 75 kg of sauna stones with a diameter of 1.2 -2 in / 3–5 cm.
• Refer to the information on how to arrange sauna stones correctly.

Installation of sauna accessories of CLIFF electric sauna heater

Installation of the safety railing of CLIFF electric sauna heater

• When mounting the safety railing, place the bracket around three fins of the heater so that the external edge of the bracket contacts the head of the threaded rod.
• Fix the sides of the bracket with a bolt and nut. Tighten the bolt so that the bracket is securely fixed around the fins of the heater.
• Attach all 8 brackets to the heater.
• Connect the wooden profiles to form the angular guard.
• Place the wooden guard on the brackets and fix them with screws. The guard is complete!
• Regular maintenance with a breathable wood preservative helps to extend the useful life of the wooden parts of the safety railing. Use products that are intended for sauna! As a rule, it is sufficient to perform the maintenance once a year, but the maintenance interval might be shortened if you use the sauna frequently.

Installation of the embedding flange of CLIFF electric sauna heater

• Prepare the opening for the embedding flange. Refer to the figure below.
• It is important to maintain inclined cuts in the corners for attaching the screws.
• Position the slats so that the fit around the opening.
• Drill screw holes with a diameter of 0.12 in / 3 mm to the central fixation points of the slats.
• Fix the slats with the supplied screws. You’re set to go!

Installation of the reflector of CLIFF electric sauna heater

• Attach the reflector to the desired side of the heater so that the upper hooks of the reflector lock around the fourth rib from the top of the heater. Ensure that all hooks are fixed – this prevents horizontal movement of the reflector. Ready!
• Utilization of the reflector reduces safety distances from flammable materials by half.
• Important! It is easier to perform the mounting tasks if you first stack the sauna stones and then attach the reflector to the heater.

Downloadable installation manual: HUUM CLIFF Manual US

Required checkups before installation
Installation of CLIFF Mini electric sauna heater
Connecting the CLIFF Mini electric sauna heater to the power supply
Disassembling the CLIFF Mini electric sauna heater fins for stacking sauna stones
Sauna stones

Required checkups before installation

• Before installing the CLIFF Mini electric sauna heater, verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimum safety distance from the ceiling and the walls of the steam room that apply to the positioning of the electric sauna heater are presented in Table 1.

Installation of CLIFF Mini electric sauna heater

When positioning the heater, ensure that there is a safe clearance between flammable materials and the external surfaces of the heater.

• When choosing a suitable location, ensure that you can conveniently throw water on sauna stones when sitting on the sauna bench.
• Ensure that the location of the heater does not create hazardous situations during its use. Make sure that people would not have to pass too closely by the hot heater.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• Power cable inlets are located on the bottom cover of the heater.
• CLIFF Mini is attached to the wall with a special bracket. Fix the bracket with 4 screws to the wall as shown below and attach the sauna heater to the bracket.

       Table 1

Connecting CLIFF Mini electric sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC-insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker are provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW

(240V)

RoomCircuit breaker

(A)

Wire size(AWG)CLIFF Mini 44124-212 ft³3,5-6 m³203 x 2,5

Table 3Power rating kW

(208V)

RoomCircuit breaker

(A)

Wire size(AWG)CLIFF Mini 42.85106-160 ft³3-4.5 m³2012

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board, as shown on the circuit diagram.
• Close the cover.
• Fix the cable in the cable clamp.

Disassembling CLIFF Mini electric sauna heater fins for stacking sauna stones

CLIFF Mini electric sauna heater is narrow and tall. Therefore, it is easier to lay the sauna stones when the fins of the heater are removed. You can do it with 2 blocks  that are supplied with the heater.

Refer to the figure below and follow these instructions:

1. Loosen the nuts of the threaded rod on the bottom of the heater by 0.12 in / 5 mm.

2. Push both props between the fins of the heater.

3. The fin is released from both sides.

4. Remove the fin carefully from the joints, first from the right end, and then from the left end.

Important! Pull the fin away from the heater straight, and without turning the fin or using force – this enables to avoid bending the tenons.

• Repeat the same steps for disassembling the fin that is located under the removed fin.
• Replace the fins by following the provided instructions in reverse order. The fin must be attached to the joint first from the left end, and then from the right end.

Sauna stones

• Sauna stones with a diameter of 1.2 – 2 in / 3–5 cm are suitable for CLIFF Mini electric sauna heaters. It is recommendable to use round sauna stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna rocks from other manufacturers may be used in HUUM sauna heaters, but in such a case it is recommended to choose stones that are specifically meant to be used in sauna heaters and to avoid decorative stones as they may break easily.

Quantity of sauna stones

• CLIFF Mini electric sauna heater requires 132 lb / 60 kg of sauna stones with a diameter of 1.2-2 in / 3–5 cm.
• Refer to the information on how to arrange sauna stones correctly.

Installation of HIVE Wood wood-burning stove

Downloadable installation manual of HIVE Wood wood-burning stove: HUUM HIVE Wood manual US

Required checkups before installation
Installation of the sauna heater
Installation of HIVE Wood 17 LS that is heated from another room
Connecting the sauna stove with the chimney flue
Sauna stones

Installation of sauna accessories for the HIVE Wood burning stove

Installation of the thermal plate
Installation of the heat exchanger (water jacket)
Installation of the stone cage
Installation of the reflector

Required checkups before installation

• Verify that the chosen HIVE Wood wood-burning stove model complies with the dimensions of your sauna room. Nominal heating power (kW) of the sauna stove must be in accordance with the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• HIVE Wood 13 is suitable for sauna rooms sized 212-459 ft³ (6-13 m³), and HIVE Wood 17 is intended for steam rooms with a cubic size of 283-565 ft³ (8-16 m³).
• The minimal safety distance between the ceiling and the walls of the steam room and flammable materials are presented in Table 1.

Installation of the sauna heater

• Mounting of the sauna stove must conform to all local normative documents, including relevant national standards concerning installation.
• NB! Burn outside before installation!
  The outer casing of the heater has been treated with heat-resistant paint, which achieves its final protection after the first heating. Care must be taken when handling metal parts until the heater has been heated to avoid scratching. As the paint emits an unpleasant odor during the first heating, we recommend that you heat the heater outdoors, if possible, for the first time before installing the heater in the steam room. For a better draft, attach a handy piece of flue to the heater’s smoke outlet during the first heating.
• Before installing the sauna stove, check the safety distances provided in Table 1. Safety distances A, B, and 47.3 in/1200 mm above the sauna stove apply to flammable materials.
• If the stove is installed in a niche made of non-combustible material (stone, concrete), at least 4 in/100 mm should be left between the wall and the stove for air movement.
• Safety distance from flammable materials may be reduced to 1/2 when a single heat barrier (heat reflector) is used and to 1/4 in the case of a double heat barrier. Heat barrier is included within the safety distance, and clearance between its outer surface and the protected area must be at least 1.2 in/30 mm.
• Install the sauna stove on a non-combustible surface that has sufficient load-bearing capacity.
• There should be no electrical devices, wires, or cords in the safety area of the sauna stove.

       Table 1

Installation of HIVE Wood 17 LS that is heated from another room

• The furnace bushing of the sauna stove must be made through a non-combustible wall (stone, concrete, etc.).
• In addition, it is recommendable to use insulation with mineral wool or a similar material.
• Leave at least 0.4 in/10 mm between the bushing and the stove for air movement. When calculating the dimensions of the opening, add 0.8 in/20 mm to the height D and width G provided in Table 1.
• If the floor in front of the furnace is made from combustible material, fire-resistant floor protection (thermal plate) must be installed in front of the furnace door. The protection must be 23.63 in/600 mm wider than door width G, with a depth of at least 15.75 in/400 mm.

Connecting the sauna stove with the chimney flue

• The sauna stove must be connected to the chimney flue by a specialist.
• The flue gas outlet is on the top of the sauna stove. The sauna stove is connected to the chimney flue with special flue pipes that may be caulked with heat-resistant sealing rope, when necessary.
• The curves of the elbows of the connection pipes must be smooth in order to minimize draught loss.
• The pipe is inserted through the wall of the chimney and then sealed with mineral wool.
• The flue gases of the stove must be directed into a separate flue. It is forbidden to use a common flue that is utilized with other furnaces.

Important! Utilization of forced extract ventilation might cause problems with air exchange of the room and insufficiency of furnace combustion air; therefore, designing and constructing such ventilation systems is permitted only on the sole responsibility of a licensed specialist.

Sauna stones

• Sauna stones with a diameter of 2-4 in (5–10 cm) are suitable for HIVE Wood wood-burning stoves. It is recommendable to use round sauna stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round  olivine diabase sauna stones and are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such a case it is recommended to choose stones that are specifically meant for use in sauna heaters and to avoid decorative stones as they may break easily.

Quantity of sauna stones

• HIVE Wood 13 burning stove requires 198 lb / 90 kg of sauna stones with a diameter of 2-4 in (5–10 cm).
• HIVE Wood 17  and HIVE Wood 17 LS burning stoves require 298 lb / 135 kg of sauna stones with a diameter of 2-4 in (5–10 cm).

Installation of sauna accessories for the HIVE Wood wood-burning stove

Installation of the thermal plate

• Choose the desired location for the thermal plate. When positioning the plate, pay attention to ensuring the safety distances stipulated in the user manual of the sauna stove.
• Adjust the height of the legs so that the thermal plate is level and stable and does not sway on the floor. If possible, use a spirit-level.
• Place the sauna stove in the center of the thermal plate so that the distance from all sides of the plate is equal.
• After placing the sauna stove on the plate, verify again that the safety distances of the sauna stove are proper.

Installation of the heat exchanger (water jacket)

Before mounting the heat exchanger (water jacket), install the HIVE Wood wood-burning stove, but don’t stack it with sauna stones. You will need a separate water tank that will be connected to the water jacket.

• Heat exchanger may be placed at the rear side of the sauna stove, or at one of the lateral sides.
• The heat exchanger must be fitted on the triangular frame, tightly against the sauna stove.
• When connecting the water jacket with the water tank and filling the sauna stove with stones, observe that the heat exchanger remains snugly against the furnace.
• Water tank must be located higher than the pipe connections of the heat exchanger to ensure its proper functioning. The minimum diameter of the water pipe is ¾ inches. Pay attention to the inclinations of the pipe – air bubbles should not get trapped in the circulation.

Installation of the stone cage

• Place the stone cage around the chimney pipe.
• Fill the cage with sauna stones.
• Important! You can place several cages around the chimney pipe. Use 3 bolts for connecting two cages. The maximum diameter of the bolts is M6 and minimal length of the threads is 0,55 in / 14 mm. Choose nuts that are suitable for the bolts.
• Use approximately 66 lb / 30 kg of sauna stones with a diameter of 2-4 in / 5–10 cm for filling the stone cage.

Installation of the reflector

• Place the reflector on the collars so that the upper hook of the reflector fits over the upper collar of the heater, and the lower hook goes around the closest collar. Ready!
• In the case that you wish to join several reflectors together, set the external edges of the reflectors against each other, and fasten their upper and lower parts with bolts and nuts.

Installation of HIVE Heat wood-burning stove

Downloadable installation manual: HIVE Heat Manual US

Required checkups before installation
Installation of the sauna stove
Installation of HIVE Heat 12 LS that is heated from another room
Connecting the sauna stove with the chimney flue
Sauna stones

Installation of sauna accessories of the HIVE Heat wood-burning stove

Installation of the thermal plate
Installation of the heat exchanger (water jacket)
Installation of the stone cage
Installation of the reflector

Required checkups before installation

• Verify that the chosen HIVE Heat wood-burning stove model complies with the dimensions of your sauna room. Nominal heating power (kW) of the sauna stove must be in accordance with the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• HIVE Heat is suitable for sauna rooms sized 212 – 459 ft³ / 6–13 m³.
• Verify that the cross-section of the chimney flue is at least 0.1 ft² / 102 cm2.
• The minimal safety distance between the ceiling and the walls of the steam room and flammable materials are presented in Table 1.

Installation of the sauna stove

• Mounting of the sauna stove must conform to all local normative documents, including relevant national standards concerning installation.
• Before installing the sauna stove, check the safety distances provided in Table 1. Safety distances A, B and 47.3 in / 1200 mm above the sauna stove apply to flammable materials.
• If the stove is installed in a niche made of non-combustible material (stone, concrete), at least 4 in /100 mm should be left between the wall and the stove for air movement.
• Safety distance from flammable materials may be reduced to 1/2 when a single heat barrier (heat reflector) is used and to 1/4 in the case of a double heat barrier. Heat barrier is included within the safety distance, and clearance between its outer surface and the protected area must be at least 1.2 in/30 mm.
• Install the sauna stove on a non-combustible surface that has sufficient load-bearing capacity.
• There should be no electrical devices, wires, or cords in the safety area of the sauna stove.

       Table 1

Installation of HIVE Heat 12 LS that is heated from another room

• The furnace bushing of the sauna stove must be made through a non-combustible wall (stone, concrete, etc.).
• In addition, it is recommendable to use insulation with mineral wool or a similar material.
• The furnace bushing of the sauna stove must be made through a non-combustible wall (stone, concrete, etc.) that extends 600
  mm / 23.63 in to the sides of and 1 400 mm / 55.1 in above the opening.
• Leave at least 2 in/50 mm between the bushing and the stove for air movement. When calculating the dimensions of the opening, add 4 in/100 mm to the height D and width C provided in Table 1.
• If the floor in front of the furnace is made from combustible material, fire-resistant floor protection (thermal plate) must be installed in front of the furnace door. The protection must be 23.63 in/600 mm wider than door width G, with a depth of at least 15.75 in/400 mm.

Connecting the sauna stove with the chimney flue

• The sauna stove must be connected to the chimney flue by a specialist.
• The Flue gas outlet is on the top of the sauna stove. The sauna stove is connected to the chimney flue with special metal flue pipes that may be caulked with heat-resistant sealing rope when necessary.
• The curves of the elbows of the connection pipes must be smooth in order to minimize draught loss.
• The pipe is inserted through the wall of the chimney and then sealed with mineral wool.
• The flue gases of the stove must be directed into a separate flue. It is forbidden to use a common flue that is utilized with other furnaces.

Important! Utilization of forced extract ventilation might cause problems with air exchange of the room and insufficiency of furnace combustion air; therefore, designing and constructing such ventilation systems is permitted only on the sole responsibility of a licensed specialist.

Sauna stones

• Sauna stones with a diameter of 2-4 in / 5–10 cm are suitable for HIVE Heat wood-burning stoves. It is recommendable to use round sauna stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• You can also use granite fieldstones, or other commercially available stones that are specifically meant to be used in sauna stoves. It is not recommended to use ceramic stones in sauna stoves as they break easily and shorten the useful life of the sauna stove.

Quantity of sauna stones

HIVE Heat 12 wood-burning stove requires 198 lb / 90 kg of sauna stones with a diameter of 2-4 in / 5–10 cm.

Installation of sauna accessories of HIVE Heat wood-burning stove

Installation of the thermal plate

• Choose the desired location for the thermal plate. When positioning the plate, pay attention to ensuring the safety distances stipulated in the user manual of the sauna stove.
• Adjust the height of the legs so that the thermal plate is level and stable and does not sway on the floor. If possible, use a spirit-level.
• Place the sauna stove in the center of the thermal plate so that the distance from all sides of the plate is equal.
• After placing the sauna stove on the plate, verify again that the safety distances of the sauna stove are proper.

Installation of the heat exchanger (water jacket)

Before mounting the heat exchanger (water jacket), install the HIVE Heat burning stove, but don’t stack it with sauna stones yet. You will need a separate water tank that will be connected to the heat exchanger.

• Heat exchanger may be placed at the rear side of the sauna stove, or at one of the lateral sides.
• Heat exchanger must be fitted on the triangular frame, tightly against the sauna stove.
• When connecting the heat exchanger with the water tank and filling the sauna stove with stones, observe that the water jacket remains snugly against the furnace.
• Water tank must be located higher than the pipe connections of the heat exchanger to ensure its proper functioning. The minimum diameter of the water pipe is ¾ inches. Pay attention to the inclinations of the pipe – air bubbles should not get trapped in the circulation.

Installation of the stone cage

• The stone cage is placed around the chimney pipe.
• Fill the cage with sauna stones.
• Important! You can place several cages around the chimney pipe. Use 3 bolts for connecting two cages. The maximum diameter of the bolts is M6, and the minimal length of the threads is 2 in / 14 mm. Choose nuts that are suitable for the bolts.
• Use approximately 66 lb / 30 kg of sauna stones with a diameter of 2-4 in / 5–10 cm for filling the stone cage.

Installation of the reflector

• Place the reflector on the collars so that the upper hook of the reflector fits over the upper collar of the stove and the lower hook goes around the closest collar. Ready!
• In case you wish to join several reflectors together, set the external edges of the reflectors against each other and fasten their upper and lower parts with bolts and nuts.

Installation of DROP electric sauna heater

Downloadable the installation manual: HUUM DROP Manual US

Required checkups before installation
Installation of DROP electric sauna heater
Connecting the DROP electric sauna heater to the power supply
Sauna stones

Installation of sauna accessories of DROP electric sauna heater

Installation of the safety railing of DROP electric sauna heater
Installation of the embedding flange of DROP electric sauna heater

Installation of DROP electric sauna heater

Installation video for the DROP electric sauna heater

Required checkups before installation

• Before installing the DROP electric sauna heater, verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
• Ensure that the power rating (kW) of the heater matches the cubic size (ft³) of the steam room. In case there are any uninsulated brick, tile, or glass walls in the sauna room, an additional volume of 4,8 ft³ must be added to the sauna room for each 1 ft² of such wall.
• The minimum safety distance from the ceiling and the walls of the steam room that apply to the positioning of the electric sauna heater are presented in Table 1.

Installation of DROP electric sauna heater

When positioning the heater, ensure that there is a safe clearance between flammable materials and the external surfaces of the heater.

• DROP electric sauna heater must be mounted to the wall. When choosing a suitable location, ensure that you can conveniently throw water on sauna stones when sitting on the sauna bench. The top layer of sauna stones should be at the level of your feet when you are sitting on the sauna bench.
• Table 1 gives an overview of the minimal safety distance that should remain between the heater and the ceiling and the walls of the steam room.
• When choosing the mounting location for the heater, pay attention to potentially hazardous situations that might arise during its use. Make sure that people do not have to pass too closely by the hot heater.
• Before installation, remove the protective film from the steel plate behind the heater.
• When installing the wall mount, take the full weight of the heater, 143 lb (65 kg) into consideration.

Table 1

Connecting the DROP electric sauna heater to the power supply

Only a certified electrician may connect the heater to the power supply.

• The power cable of the heater must meet the requirements of UL 62 in US and CSA 49 in Canada.
• It is forbidden to use a PVC-insulated non-heat-resistant cable as the power cable of the heater.
• The junction box must be waterproof and located up to 19.7 in (50 cm) from the floor.
• It is recommendable to connect the unit to the mains power supply without an earth leakage circuit breaker.
• The cross-sectional area of the cable and maximum amperage of the circuit breaker is provided in Table 2 (240V) and Table 3 (208V).

Table 2Power rating kW

(240V)

RoomCircuit breaker (A)Wire SizeAWGDROP 44.5106-247 ft³3–7 m³3010DROP 66177-353 ft³5–10 m³3010DROP 97.5247-424 ft³7–12 m³408DROP 99282-530 ft³8–15 m³508

Table 3Power rating kW

(208V)

RoomCircuit breaker (A)Wire SizeAWGDROP 43.488-194 ft³2.5-5.5 m³2012DROP 64.5141-282 ft³4-8 m³3010DROP 95.6176-318 ft³5-9 m³308DROP 96.75211-388 ft³6-11 m³408

• Open the cover of the heater’s electrical box.
• Connect the power cable with the terminal board, as shown on the circuit diagram.
• Close the cover.
• Fix the cable to the output part with a cable strap.
• Attach the heater to the wall mount, and ensure that it is securely fixed to the wall.

Sauna stones

• Sauna stones with a diameter of 2-4 in / 5–10 cm are suitable for DROP electric sauna heaters. It is recommendable to use round stones in HUUM sauna heaters. Round stones complement the design of the heaters and provide milder steam. Our product range includes round olivine diabase sauna stones which are sold in packs weighing 33 lb / 15 kg.
• Of course, sauna stones from other manufacturers may be used in HUUM sauna heaters, but in such a case it is recommended to choose stones that are specifically meant for use in sauna heaters and to avoid decorative stones as they may break easily.

Quantity of sauna stones

• DROP electric sauna heater requires 121 lb / 55 kg of sauna stones with a diameter of 2-4 lb / 5–10 cm.
• Refer to the information on how to arrange sauna stones correctly.

Installation of sauna accessories of DROP electric sauna heater

Installation of the safety railing of DROP electric sauna heater

• Attach the arcs of the safety railing to the bracket (1) with four screws (4 x 13 mm) and form a complete wooden guard from the semicircles.
• Place the wooden guard on the grid of the DROP electric sauna heater, and insert the bracket into the third gap from the top (between the third and fourth wire rod) so that the foremost vertical wire rod goes tightly into the recess of the bracket (1). Fix the bracket (1) around the wire rod using a bolt and a nut.
• Rest the inner plates (2) of the wall bracket on the plywood guard. Insert a nut to fix the position of the guard (when necessary, push firmly so that the nut collar fits snugly against the bracket). Important! Do not fix the outside plates (3) with bolts.
• Verify that the plates (2) of the wall bracket are properly positioned, and fasten them to the wall with four screws (recommendable diameter of the screws is 4 mm, length and type depend on the material of the wall). Important! Observe that the wooden arc is parallel to the upper wire rod of the heater.
• Insert the outside plates (3) of the wall bracket into the openings of the inner plates (2), and position the wooden arcs between the bracket so that all drilled holes are aligned.
• Fix the bracket with a bolt and a nut. The guard is complete!

Important! The supplied longer wall screws are meant to be used when the assembly is fastened to the wooden boards. Consult with a specialist in order to ascertain whether they are suitable for your wall material.

Installation of the embedding flange of DROP electric sauna heater

The embedding flange must be installed before mounting the DROP electric sauna heater.

• Place the plates of the embedding flange on the bench boards as desired. Ensure that the edges of the embedding flange are against the wall.
• Mark the inner border of the embedding flange to the bench boards.
• Observe the marked line and draw an external outline that is 2 in / 52 mm apart. It is recommended to use a wooden block with a width of 2 in / 52 mm.
• Cut through the wider outline and create an opening.
• Mount the brackets of the embedding flange to the plates using a bolt and a nut.
• Insert the embedding flange into the opening and adjust the cut rim if necessary.
• Fix the brackets to the bench boards with screws.
• You are now ready to mount the DROP electric sauna heater. Pay attention to the minimum height that is depicted on the figure.

Installation of UKU sauna control system

Downloadable user manual: HUUM UKU Manual US

Contents of the set
Functions of the control system
Important considerations before installation
Installation of UKU sauna control system

Contents of the set

UKU sauna control system set contains all components that are necessary for mounting and using the control system:

• Sauna control panel (CLASSIC Black)
• Cable for the sauna control panel (118 in/3 m; 4×22 AWG)
• Main module
• Temperature sensor
• Door sensor
• Cables for temperature and door sensors (197+197 in/5+5 m; 2×24 AWG)

Functions of the control system

• Child lock
  The child lock function ensures safety when using the sauna control panel in families with small children.
• Steamer
  The steamer function enables one to configure the intensity of the steamer that is connected to the control system.
• Lighting
  The lighting function enables one to switch the sauna room light fitting that is connected to the control system on or off.
• Steamer safety
  This is a safety function that informs you when the steamer has run low on water.
• Heating time
  You can use the settings of the control panel for configuring the maximum heating time – the control system switches the sauna heater off automatically when the preset time has passed.
• Temperature unit
  You can select the desired unit for the sauna temperature.
• Heating algorithm
  You can select between Simple and Smart heating algorithms. Simple algorithm keeps all heating elements switched on until the desired target temperature is achieved. Smart algorithm starts gradually turning the heating elements off before the target temperature is reached. Smart algorithm helps to reduce the consumption of electricity, especially in heaters where the quantity of sauna stones is big (> 110 lb).
• Vent/light
  This function enables one to automatically switch the ventilation system or sauna lighting fitting that is connected to the control system on for 10, 15, or 20 minutes whenever the door is opened.
• Timer
  You can configure the start time for sauna heating with increments of 30 minutes.
• Door sensor
  The door sensor enables one to prevent overheating and switches the sauna heater off when the steam room door is open.
• Temperature sensor with overheating protection
  Overheating protection is employed when the temperature of the sauna room has risen to approximately 266°F (130°C) degrees in order to prevent thermal damage.

Important considerations before installation

Before installing the unit, read the user manual carefully. This enables one to utilize all the necessary functions and prevent accidents that may arise from ignorance.

• Only an electrician or a specialist with equivalent qualification may install the unit.
• Installation and maintenance works may only be performed when the unit is not powered on.
• If you encounter problems that are not covered in the user manual of the UKU sauna control system, contact the distributor of the unit for advice.
• It is forbidden to modify or remodel the unit without authorization.
• Ensure that the cross-section of the cabling between the building’s switchboard and the main module and the sauna heater is sufficient. Proper cross-section depends on the power rating of the sauna heater and is provided in the user manual of the sauna heater.
• In the case of an older building, check the condition of the junction boxes and, if possible, install a new cable between the switchboard and the sauna. Install a separate current protection device for the sauna.
• It is recommended to connect the device to the mains without a Residual-current device (RCD).
• UKU sauna control system is meant to be used with equipment that complies with the requirements stipulated in EN 60335-2-53:2011.

Installation of UKU sauna control system

• Before installing the unit, disconnect the supply current of the respective cables from the switchboard.
• The sauna control panel must be installed outside the steam room, at the user’s eye level next to the door, or according to the
  manufacturer’s recommendations.
• If your main module supports a Wi-Fi connection, choose a location with signal propagation. Insulated spaces and cabinets (such as the sauna room or metal switchboards) are not suitable.
• The main module must be installed in a dry place. The protection degree of the device is IPX4. The power cables must be anchored
  via the provided cable gland.
• In order to prevent damage, ensure that the temperature of the operating environment of the main module remains between -4 °F and 104 °F. The relative humidity of the room should not exceed 95%.
• Before powering the controller, make sure that the main module is sealed so that there is no possibility for pollution or only for dry, non-conductive pollution to occur on the components inside the main module while in use. All the cable inlets and the module box shall be properly sealed.

Detailed instructions for mounting the main module, the control panel, the door sensor, and the temperature sensor of the UKU sauna control system are provided in the user manual of the UKU sauna control system: HUUM UKU Manual US

What makes HUUM sauna heaters special?

HUUM sauna heaters stand out with their design that has won international awards, high quality, and particularly mild and long-lasting steam. The pure Nordic design of the sauna heaters is inspired by nature and unveils the natural beauty of sauna stones.

HUUM sauna heaters have a large holding capacity of sauna stones, which ensures gentle steam that resembles traditional wood-fired saunas. Craftsmanship of sauna heaters involves just a small amount of metal – therefore, the majority of the heat derives from the stones and not from the metal. This maximizes the proportion of beneficial negative ions in the steam room air.

HUUM electric sauna heaters are controlled with a smart UKU sauna control system, which enables one to configure the heating time and temperature settings. It is also possible to connect the control systems to sauna ventilation or lighting devices. UKU WiFi sauna control system is compatible with the HUUM mobile app – you can start heating your sauna from your phone, irrespective of where you are.

The selection of HUUM sauna heaters includes models that are suitable for smaller or larger steam rooms with cubic sizes varying in the range of 124-1236 ft³ / 3.5-35 m³.

The power rating of a suitable sauna heater depends on the steam room’s size and insulation.

As a rule of thumb, heating 35.3 ft³ / 1 m³ of the steam room requires 1 kW of power. When the capacity of the heater is too low, it heats the sauna slowly, does not provide enough steam, and might burn out faster. A heater that has excessive capacity does not cause problems if it is equipped with a thermostat and used correctly.

Another important consideration is the insulation of the steam room. In the case that there are uninsulated walls made of bricks, tiles, glass or logs in the steam room, an additional volume of 4.8 ft³ per each such square feet of the wall should be added to the cubic size of the steam room.

You can use our sauna calculator to determine the calculated volume of the steam room. If you wish to calculate the cubic size of the steam room yourself, multiply the length by the width and the height in feet. Then calculate the surface area (ft²) of uninsulated brick, tile, glass or log walls, multiply it by 4.8, and add it to the previous result. As a result, you’ll have your steam room calculated volume (ft³), which is the basis for establishing the proper power rating of the sauna heater. If the capacity falls between two different values, we recommend choosing the sauna heater that has a higher power rating.

If the sauna heater has the right size, it raises the temperature by approximately 50°F / 10 °C  within 8 minutes and heats the steam room to 176°F / 80 °C within an hour.

We recommend using natural and round sauna stones. Our product range includes olivine diabase sauna stones that are light gray, round, durable and have a high thermal capacity. It is not recommended to use decorative stones in sauna heaters as such stones can easily break.

HUUM sauna heaters are made of stainless steel. Page “Craftsmanship” provides more information on the production process.

All HUUM sauna heaters and sauna controllers are made in Estonia.

Page “Distributors” includes the list of shops, e-stores, and sauna-building companies that sell HUUM sauna heaters.

HUUM sauna heaters have a 5-year guarantee.

The set contains the sauna heater and depending on the chosen model, adjustable legs or a wall mount. Sauna stones, the sauna controller, and the power cable are not included in the set.

Only a certified electrician may install the cables and connect the heater to the power supply.

Instructions for mounting the cables are provided in the product’s installation manual. The cables should be installed by a certified electrician.

Does your current sauna heater have a controller, or is it a mechanical heater?

If your sauna heater supports using a controller and has a temperature adjustment function, you can simply replace the heater. Install the heater in accordance with the product’s installation manual and with the help of a certified electrician.

Do you have a mechanical sauna heater that is not equipped with a controller and has an attached switch?

In such a case, you will also need a sauna controller that has a temperature adjustment function. You should also set up some cables. Install the heater in accordance with the product’s installation manual and with the help of a certified electrician. Please note that you’ll most likely need to also install some cables inside the wall when you mount the sauna heater.

Sauna controllers and UKU control systems

UKU sauna control system enables one to heat the sauna with a few clicks and to configure its temperature from the wall-mounted sauna control panel or through the mobile app. It is possible to connect the UKU control system to the sauna lighting/ventilation and a vaporizer. There are two variations of the control system: UKU Local and UKU WiFi.

Features of the UKU control system:

• timer
• child lock
• door sensor
• suitable for sauna heaters with a capacity of up to 18 kW
• controllers are available with different color and style options
• the control system is compatible with electric sauna heaters from various manufacturers

These are variations of the UKU control system. The only difference between UKU Local and UKU WiFi resides in whether the model is based on using solely the control unit on site, or also permits using the remote control option. UKU Local enables one to heat the sauna and to configure relevant functions from the control panel that is mounted to the sauna room wall only, while UKU WiFi also supports the utilization of the HUUM mobile app. UKU WiFi needs a connection with a WiFi network.

HUUM sauna heaters are operable with controllers of different manufacturers on the presumption that they are certified and have the integrated temperature adjustment function. The capacity of the sauna heater should remain within the range established by the manufacturer of the controller.

No. A prerequisite of using HUUM electric sauna heaters is a controller that has a temperature adjustment function. Our sauna heaters are not equipped with an ON/OFF button.

Yes, if the sauna heater supports using a controller and has a temperature adjustment function. It would be too complicated with mechanical heaters, and we don’t recommend doing it.

Yes. Instructions for installing the controller and connecting it to a combi heater are provided in the user manual of the UKU sauna control system: HUUM UKU user manual.

UKU sauna control system set contains all the components that are necessary for mounting and using the control system:

• Sauna control panel CLASSIC Black. (GLASS or WOOD sauna control panels can be purchased separately)
• Main module 
• Temperature sensor
• door sensor
• Cables for temperature and door sensors 
• Connection cable for the control panel.

The sauna control panel must be installed outside the steam room. It is recommended to mount it at the user’s eye level next to the door of the steam room.

The main module must be installed in a dry place that is easy to access. It is not recommended to mount the main module in the steam room – the user is solely responsible for installing the main module in the steam room.

When installing a UKU WiFi sauna control system, it is vital to ensure that WiFi coverage is available at the location chosen for the main module.

More detailed information is provided in the section “Installation of UKU sauna control system”.

Our product range includes sauna controllers with wooden, glass, and plastic enclosures of different colors.

WOOD sauna control panels are handcrafted and made of thermo-treated ash. Each controller has a unique wood pattern.

The selection of GLASS sauna control panels includes black GLASS Black, reflecting GLASS Mirror, and golden GLASS Gold.

CLASSIC sauna control panels are available in different colors. You can choose between black, white and gray.

HUUM sauna controllers are easy to use. The controller enables one to heat the sauna and set its temperature and functions (e.g., ventilation/lighting or the steamer). In order to use the controller, it must be connected to the UKU sauna control system. Choose a control system that complies with your preferences: UKU Local or  UKU WiFi.

UKU Local enables one to heat the sauna from the wall-mounted control panel only. UKU WiFi allows one to heat the sauna from the control panel, and also through the HUUM mobile app that is downloaded to the smartphone.

• Before using the controller, ensure that all model-specific necessary connections of the control system are established (refer to “Establishing the connection between the UKU WiFi control system and HUUM mobile app”.
• One short press of the button switches the controller on and starts and ends heating.
• Both UKU sauna control system models enable one to adjust the sauna temperature 104–230 °F.
• Press and hold the button for 10 seconds, and open the settings menu to select the desired heating time. You can choose between 3, 6, 12 and 18 hours. Default setting for heating time is 3 hours.
• To select the desired temperature, simply turn the button. Target temperature of the sauna is displayed in the top right corner of the screen. Current temperature of the sauna is displayed in the middle of the screen.
• Press the button to start heating.
• You can use the timer to configure the desired start time for heating. To activate the timer, press and hold the button for 3 seconds. Then choose the desired start time for heating, and start the timer with a single short press of the button.
• During heating, the screen is always active, and the heating icon is displayed above the temperature reading.
• The controller automatically switches off when sauna heating has ended, or when you have finished using the button without heating.
• For accessing the settings menu, press and hold the button for 10 seconds. The settings menu of the controller enables one to configure all other functions, such as the Steamer,  Lighting and the Child lock.

• You can switch the Steamer function on from the settings menu of the controller.
• In order to open the menu, press and hold the button for 10 seconds.
• Select the function from the menu, and adjust the settings for the steamer – press and hold the button, and turn it to the right (more steam) or to the left (less steam).
• Intensity of the steamer is displayed in the lower left corner of the screen (indication in the range from 1 to 10).
• The steamer can only be used when sauna heating mode is on.
• In steam rooms without a humidity sensor, the steamer can only be used when the temperature does not exceed 158 °F / 70 °C.

• You can switch the Lighting function on from the settings menu of the controller.
• In order to open the menu, press and hold the button for 10 seconds, and select the setting “Lamp: On” from the menu.
• After selecting the function from the menu, lighting can be switched on and off with two quick presses of the button .

• You can switch the Child lock function on from the settings menu of the controller.
• In order to open the menu, press and hold the controller button for 10 seconds.
• When the function is activated, the child lock turns on automatically once the screen of the controller switches off.
• In order to turn the child lock off and activate the screen, press and hold the button, turn it 90 degrees to the right and then back, and subsequently 90 degrees to the left and then back.

The prerequisite for establishing the connection between the sauna control panel and the mobile app is having a UKU WiFi sauna control system.

UKU Local enables you to heat the sauna only from the wall-mounted control panel, but you can optionally upgrade it for WiFi connectivity. Refer to the following section: “Upgrading UKU Local control system for WiFi connectivity”

• For connecting UKU WiFi control system to the mobile app, see “Establishing the connection between UKU WiFi control system and HUUM mobile app”.

The HUUM app is operable with the UKU WiFi control system model, which supports establishing connections with the Wi-Fi network. HUUM mobile app lets you heat your sauna conveniently, irrespective of where you are. The application allows you to select start and end times for sauna heating, to set the desired temperature and the current temperature in real-time.

1. Download the HUUM mobile app (or open the HUUM web app)

2. Sign up

Fill in the required fields and create a user account for the application.

3. Bind the control system ID with your user account

The control system ID (XXXXXX) is also the ID of your sauna. The respective code is provided on the sticker attached to the top right corner of the main module cover. If the UKU WiFi control system is connected to a Wi-Fi network, it promptly connects to the mobile app.

4. Check the performance of the app functions

Try switching some functions on to verify that they work correctly and are communicated to the sauna (e.g., select different temperature and heating time settings, or switch the sauna heater on and off). For example, the mobile app enables one to configure the desired temperature and select start and end times for sauna heating. The function should apply within 60 seconds after selecting the respective command from the menu.

5. Start heating the sauna

Once you have selected the target temperature and other suitable parameters, switch on the sauna heater. The mobile app lets one monitor the current sauna temperature in real-time. You will receive a notification when the sauna is ready.

6. Update the app

Update the HUUM mobile app regularly to ensure its proper functioning. We recommend switching on automatic updates.

In order to link the UKU WiFi control system with the HUUM mobile app, first connect the control panel to a Wi-Fi network. UKU WiFi control system supports the 802.11 b/g/n 2.4 GHz Wi-Fi standard. The control panel of the UKU WiFi control system cannot be used with 5 GHz and 6 GHz networks.

Important! UKU WiFi control system is not compatible with the ASUS Lyra Wi-Fi amplifier.

• In order to open the settings menu of the sauna controller, press and hold the control panel button for 10 seconds.
• Navigate to “Wi-Fi settings”.
• Select “Wi-Fi SSID”. Click the button to confirm your selection.
• In the menu that opens, choose the Wi-Fi network you wish to use with your sauna control system. Ensure that different Wi-Fi networks don’t have the same name. You may encounter connectivity problems when several Wi-Fi networks have the same name. In such a case, rename the respective networks.
• After selecting the desired Wi-Fi network, enter the password for the Wi-Fi network.
• Important! The main module does not support Wi-Fi network names and passwords that contain more than 20 characters.
• After entering the password, select “Connect” and follow the instructions.
• Once you have established a connection with the Wi-Fi network, follow the guidelines provided in the section “HUUM app – setting up mobile app functionality”.

If you purchased the UKU Local control system but wish to upgrade it for Wi-Fi connectivity, you can do so on the HUUM mobile app. This upgrade does not require installation by a technician on site – it is activated remotely for a small charge.

• If you wish to upgrade your system, download the HUUM app, create a user account, and link it to the ID of your sauna. Guidelines are given in the HUUM app – setting up mobile app functionality” section.
• HUUM mobile app is available for download here:

• Further instructions are provided on the mobile app.

HUUM app is a convenient mobile application that enables one to:

• Configure the desired sauna Temperature and Heating time (the last setting is stored in the memory).
• Switch the sauna heater on and off.
• Use the sauna Steamer and Lighting functions.
• Get notifications when the target temperature is reached, and the sauna is ready.
• Set sauna heating times up to four weeks in advance.

Guidelines for navigation are provided on the app.

Yes, we recommend using protective railings with your sauna heater, especially in smaller or more compact sauna spaces where the risk of accidental contact is higher. Protective railings provide an important layer of safety by reducing the chance of someone inadvertently coming into contact with the hot heater, particularly if they slip or fall. However, it’s important to note that while protective railings significantly enhance safety, they do not eliminate all risks. We encourage everyone to exercise caution and be mindful of their surroundings when enjoying their sauna session.

Let’s talk about sauna steam. The air of the hot sauna becomes dry, and hence traditionally water is thrown on the sauna stones to obtain a pleasant level of humidity. Throwing water on the hot sauna stones enables you to raise the humidity and the apparent temperature according to your preferences.

• Sauna stones must be hot

The time is right for throwing the water on sauna stones when they are hot enough for complete vaporization of the water. You can try this by throwing a small amount of water.

• Use clean and warm water to add the steam

It is wise to use hot tap water to prevent the stones from breaking from the abrupt temperature change. Water should be clean, and if possible, avoid hard water and water that has a high iron content.

• Use a small amount of water at once

We recommend throwing approximately 80 ml of water at a time. If you desire more steam, wait a few minutes and throw the same amount of water on the sauna stones. This allows the stones to dry in the meantime and regain their heat. If you notice that water runs out from the bottom of the heater, it means you have poured too much water or that the stones are not hot enough.

The condition of the sauna heater should be checked every now and then. This is particularly important when the sauna heater has not been used for a while.

• If the sauna heater does not function properly (for example, the heater does not warm up or the sauna room warms up too slowly), you’ll find advice and guidelines on our support page “Troubleshooting” section.
• Before cleaning the sauna heater or performing other tasks, disconnect the sauna heater from the power supply and ensure that the heater is not hot.
• Check the condition of sauna stones once a year or after 300 hours of heating.
• Clean the stones when necessary. Replace sauna stones that have started to erode or have become remarkably lighter. Remove all small stone chips from the sauna heater. Learn more from the section “Sauna stones”.

Heating elements require replacement only when they are broken. Remove some stones from the sauna heater to verify that all the heating elements are in proper working order. Heating elements should become hot when you switch the sauna heater on. If the heating elements do not turn red, they are damaged and must be replaced.

Remove some stones from the sauna heater to verify that all heating elements are in proper working order and turn red when the heater is switched on. If a heating element does not turn red, it is broken and needs to be replaced promptly. Otherwise you risk with damaging other heating elements as well. Only a competent electrician may replace the heating elements.

• Empty the ash drawer before using the sauna stove.
• Light the fire with something small and flammable – for example, with a newspaper or small pieces of dry wood. Gradually add the wood.
• HIVE Wood and HIVE Heat sauna stoves may only be heated with wood logs. Logs with the length of 11,8 in / 30 cm are most suitable for HIVE Wood 13/HIVE Heat. It is recommendable to use logs with the length of 15,7 in / 40 cm in the case of HIVE Wood 17.
• You can adjust the amount of oxygen in the combustion process by opening and closing the ash drawer. Ignition requires more oxygen, so it is advisable to keep the ash drawer open by approximately 10 mm (0,39 in). When the wood is already burning, close the ash drawer a bit, so that about 2–3 mm  (0,12 in) of the drawer remains open. Air flow of HIVE Heat can be regulated from the choke that is located above the door.
• Keep the furnace door closed during heating, and open it only for adding wood.
• Have your eye on the fire and observe when more wood needs to be added.
• When the sauna feels hot enough, it is ready for use.
• Continue adding wood for as long as you wish to keep the sauna hot.
• Avoid overheating the sauna stove. You are overheating your stove if the furnace casing starts glowing red. Overheating causes deformation of the metal, and in such cases, we are not responsible for the resultant damages.
• In case of overheating, close the ash drawer and the furnace door completely to stop the combustion process. If possible, occlude air inflow into the room.

• Choose the right stones for your sauna stove. Natural granite stones or special sauna stones sold at hardware stores are suitable for wood-burning HIVE Wood and HIVE Heat sauna stoves. Our product range includes round olivine diabase sauna stones with a diameter of 2-4 in (5–10 cm) that are suitable for these sauna stoves.
• Empty the ash drawer before each heating since it is used for adjusting the draft.
• Clean the heating surfaces of the furnace regularly, at least once after 20 uses.
• Check the condition of sauna stones once a year or after 300 hours of heating. When necessary, replace the stones (learn more from the section “Sauna stones”).
• At least once a year ask a specialist to clean the chimney and the flue.
• If the sauna has not been used for a long time, the furnace ducts, the grate, and the ash drawer should be checked and cleaned before heating the sauna stove. It is also recommended to inspect the condition of the chimney and the flue and to ask a specialist to clean them when necessary.

Between heating, when the sauna is not hot, but there is still a lot of humidity, unwanted bacteria may start thriving in the sauna. To avoid this, it is important to take care of the cleanliness of the sauna. Here are some useful tips for keeping your sauna clean.

• Take a shower before starting your sauna session.
• Before taking a seat on the sauna bench, put something on it – a towel or a special sitting mat that can be easily cleaned afterwards. This prevents the accumulation of sweat on the sauna bench.
• Clean the steam room, the sauna bench and the shower room regularly with a disinfecting detergent. Don’t forget drainage!
• The sauna bench, the walls and the floor should be thoroughly cleaned with a scrubbing brush and a sauna cleaning agent twice a year.
• Wipe the dust and dirt from the sauna heater with a moist cloth.
• After using the sauna, open the windows and doors, and let the rooms dry.

The required quantity of sauna stones depends on the particular HUUM sauna heater model.

• DROP electric sauna heater: approximately 121 lb / 55 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE electric sauna heater: approximately 595 lb / 270 kg of stones with a diameter of 2-4 in  / 5–10 cm
• HIVE electric sauna heater with air tunnel: approximately 529 lb / 240 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Mini electric sauna heater: approximately 375 lb / 170 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Mini electric sauna heater with air tunnel: approximately 309 lb / 140 kg of stones with a diameter of 2-4 in / 5–10 cm
• CLIFF electric sauna heater: approximately 165 lb / 75 kg of stones with a diameter of 1.2-2 in / 3–5 cm
• CLIFF Mini electric sauna heater: approximately 132 lb / 60 kg of stones with a diameter of 1.2-2 in / 3–5 cm
• STEEL electric sauna heater: approximately 331 lb / 150 kg of stones with a diameter of  1.2-2 in/ 3–5 cm
• STEEL Mini electric sauna heater: approximately 132 lb / 60 kg of stones with a diameter of 1.2 -2 in /3–5 cm
• HIVE Wood 13 wood-burning stove: approximately 198 lb  / 90 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Wood 17 wood-burning stove: approximately 298 lb / 135 kg of stones with a diameter of 2-4 in / 5–10 cm
• HIVE Heat 12 wood-burning stove: approximately 198 lb / 90 kg of stones with a diameter of 2-4 in  / 5–10 cm
• Stone cage: approximately 88 lbs / 40 kg of stones with a diameter of 2-4 in  / 5–10 cm

• Proper sauna stones accumulate heat and dissipate it slowly; they are durable and withstand high temperatures. Therefore, high-density and heavy stones should be used as sauna stones.
• We recommend using round sauna stones with variable sizes in HUUM sauna heaters. This ensures that water moves between the layers of sauna stones and evaporates gradually instead of vaporizing at once into the air from the top layer. In addition – the round and soft shape of sauna stones supplements the design of our sauna heaters.
• Our product range includes round olivine diabase sauna stones that are available with two diameters: 3–5 cm  (1.2-2 in) and 5–10 cm (2-4 in). Olivine diabase is a heavy stone, and its approximate density is 3.5 kg/dm3. It is very valuable as a sauna stone because of its durability and high thermal capacity.
• Of course, other sauna stones may also be used in HUUM sauna heaters, but in such cases, it is recommended to choose stones that are specifically meant to be used in sauna heaters and to avoid decorative stones as they may break easily. For example, granite fieldstones are perfectly suitable for sauna stoves.

• Wash the sauna stones before laying them in the heater

Rinse the sauna stones with water before placing them inside the heater. This removes dust from the rocks and provides you with more wholesome steam.

• It is advisable to temper the sauna stones before the first sauna session

Tempering the sauna stones before their first use is recommended to increase their durability. In order to do it, heat them once to the usual sauna temperature, and let them cool down slowly without throwing water on them.

And done!  Sauna stones are ready for subsequent sauna sessions!

Placement of sauna stones significantly affects the quality of the steam. In order to fill the whole space of the sauna heater properly, use smaller and larger stones.

• Sort out bigger and smaller stones

First, take all the sauna stones out of the boxes and separate the smaller stones.

• Fill the sauna heater layer by layer

Stack the sauna stones by layers – start from the bottom of the sauna heater and move towards the top. Stones should also be placed between the heating elements. If you first place sauna stones on one side only, the heating elements might deform or break. Start with bigger stones, and use smaller ones for filling the round parts of the heater and places where there is less space.

• Heating elements should not remain exposed

Leave sufficient gaps for air movement between the sauna stones, and don’t place stones too tightly around the heating elements. Ensure that the heating elements are completely covered and not visible from the exterior surface of the sauna heater. This is important as throwing water directly on the heating elements might damage them. It will also reduce the quality of the steam. Water should evaporate from the sauna stones and not from the heating elements. The top layer of sauna stones should be as dense as possible – this is where the heat arising from below accumulates.

Sauna stones don’t last forever. Contact with water and temperature fluctuations have an impact, and over time they eventually start crumbling. Therefore it is natural that every now and then they should be replaced with new stones.

Frequency of inspecting the condition of sauna stones and replacing them depends on:

• frequency of using the sauna, and
• the quality of sauna stones.

How frequently should sauna stones be exchanged?

• Check the condition of sauna stones once a year or after 300 hours of heating.
• If you heat your sauna three times a week on average, you should replace the sauna stones once a year.
• If you use your sauna less frequently, you should exchange the sauna stones once every couple of years.
• You should check the condition of the sauna stones when heating the sauna takes more time than usual or when the sauna heater does not warm up properly. This may be caused by small stone pieces that block air movement between the sauna stones.

How to check the condition of the sauna stones?

In order to inspect the condition of the stones, remove all the stones from the heater.

• Replace all the sauna stones that are eroded or have become remarkably lighter.
• Clean sauna stones that are dusty or covered with residues of iron-rich water.
• The most convenient solution is to replace all the sauna stones at the same time.

Previous sections provide information on how to prepare sauna stones before their use and how to stack the sauna stones into the sauna heater.