The installation of the Harvia 20 RS Pro requires careful planning and strict compliance with all local building regulations, fire safety requirements and technical installation standards. The manufacturer recommends this heater for sauna rooms with a volume between 8 m³ and 20 m³. Operating the heater within this recommended range is essential for achieving proper heating performance while avoiding excessive thermal stress on both the heater and the sauna structure.
Particular attention should be given to the selection and installation of sauna stones. Since the stones are supplied separately, only suitable sauna stones should be used. The maximum stone capacity of 40 kg forms an integral part of the heater’s thermal design and should not be altered arbitrarily. Correct stone placement ensures unrestricted airflow, effective heat storage and stable heat release. Damaged, cracked or unsuitable stones should never be installed.
As with all wood-burning sauna heaters, a heat-resistant installation surface and sufficient safety clearances from combustible materials are mandatory. The heater must be connected to a suitable chimney or flue gas extraction system that complies with all applicable regulations. Proper chimney design is critical for efficient combustion, operational reliability and user safety.
Adequate fresh air supply is equally important. Wood combustion requires a continuous oxygen supply, and insufficient ventilation can negatively affect combustion quality, heating efficiency and safety. A properly designed air intake and exhaust system supports clean combustion and stable sauna temperatures.
Only clean, dry and suitable firewood should be used during operation. Dry wood improves combustion efficiency, reduces soot formation and supports consistent heat production. Wet or unsuitable fuel may reduce performance, increase deposits inside the flue system and shorten the service life of the heater. Proper firing techniques and responsible refueling procedures help ensure safe and efficient long-term operation.
Before installation and commissioning, all manufacturer documentation, local regulations and national requirements should be reviewed carefully. According to the available product information, this model is not intended for sale in Germany. Professional installation by experienced specialists is strongly recommended to ensure maximum safety, performance and regulatory compliance.
