The appropriate sauna heater power is primarily determined by the volume of the sauna room. Calculate the room volume by multiplying its length, width, and height.
You should also take into account any uninsulated surfaces, such as glass, tiles, concrete, brick, or stone. These surfaces increase heat demand, so the calculated sauna volume may need to be adjusted according to the specific heater manufacturer’s recommendations.
For electric sauna heaters, a common general guideline is approximately 1 kW of heater power per 1 m³ of sauna volume, but this is not a universal rule. Wood-burning sauna heaters should be selected according to the sauna room volume range specified by the manufacturer.
Always follow the manufacturer’s instructions for the specific heater model. An undersized heater may take too long to heat the sauna and operate under excessive load, while an oversized heater may heat the air too quickly before the sauna stones have reached the proper temperature.









































