Installation of STEEL Mini electric sauna heater

Updated September 15, 2022

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

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.

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

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 2	Power rating kW (240 V)	Room	Circuit breaker (A)	Wire size AWG
STEEL Mini 4	4	124-212 ft³ 3,5-6 m³	20	12

Table 2	Power rating kW (208 V)	Room	Circuit breaker (A)	Wire size AWG
STEEL Mini 4	2.85	106-160 ft³ 3-4.5 m³	20	12

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 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.

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.