Verify that the maximum amperage of the main circuit breaker complies with the parameters of the heater.
Ensure that the power rating (kW) of STEEL Mini electric sauna heater matches the cubic size (m3) of the steam room. In case there are uninsulated walls made of bricks, tiles, glass or logs in the steam room, additional volume of 1.5 m3 per each such square meter of the wall should be added to the cubic size of the steam room.
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 heater, ensure that there is a safe clearance between flammable materials and 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 rocks 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 (minimum recommended measures for the screws: 6 x 40 mm) to the wall as shown below and attach the sauna heater to the bracket.
Connecting the sauna heater to the power supply
Only a certified electrician may connect the heater to the power supply.
A rubber insulated SIHF-JB cable or an equivalent cable must be used as the connection cable. 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 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.
Power rating (kW)
Heating elements (kW)
Circuit breaker (A)
Power cable (N x mm²)
3 x 10
5 x 2.5
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 rocks with a diameter of 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 and are sold in packs weighing 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
STEELMini electric sauna heater requires 60 kg of sauna stones with a diameter of 3–5 cm.