How to choose a sauna heater? A practical guide for everyone
The heater is the heart of every sauna – its task is to quickly and effectively raise the temperature and maintain it at a level that ensures a comfortable and healthy session. The choice of heater greatly influences not only heating efficiency but also the atmosphere, operating costs, and safety of use.
1. Types of heaters – what you should know
There are several main types of sauna heaters available on the market, each with different advantages:
Electric heaters are the most popular solution for home and garden saunas. They are easy to install, control, and maintain. Thanks to thermostats and timers, you can precisely set the temperature and operating time without the need for lighting a fire or constant tending.
Wood-burning heaters are a classic solution that provides a traditional atmosphere and characteristic sauna aroma. They deliver very high temperatures but require access to a chimney flue, regular wood replenishment, and more frequent tending.
Gas heaters are less common but offer fast heating and lower operating costs. However, they require a gas installation and appropriate safety measures.
Infrared heaters do not heat the air but radiate heat directly onto the body. This is a good solution if you want to use the sauna at lower temperatures and avoid very hot air.
2. Choosing heater power – the most important rule
The basic rule when choosing a heater is to match its power to the volume of the sauna. Generally, it is assumed that for every 1 m³ of sauna volume, approximately 1 kW of heater power should be allocated. If the sauna has large glass elements, poor insulation, or a stone finish, it is worth increasing the heater's power by about 10–20% to achieve a stable temperature and fast heating.
Example:
sauna with a volume of 6 m³ → heater with approx. 6 kW power
sauna 8 m³ → heater approx. 8 kW
sauna larger than 10 m³ → heater 10 kW or more
3. Classic electric heaters – recommended models
Some popular electric heaters that work well in home and garden saunas:
Harvia Vega (e.g., BC45, BC60) – a series with built-in control knobs, various power outputs (4.5 kW and 6 kW) allow selection for small and medium-sized saunas. Large stone capacity provides pleasant steam.
Harvia Cilindro – cylindrical heaters with a large number of stones, providing gentler steam. Often chosen for medium and larger saunas.
HUUM Drop / HUUM Hive – modern heaters with a large number of stones, often with app control options. They provide dense and gentle steam.
EOS, Tylo, Amerec – reputable brands offering electric heaters from compact to very efficient, with various control options (mechanical, digital, remote).
4. Wood-burning heaters – when to choose them
Wood-burning heaters provide high temperatures and the characteristic aroma of burning wood, creating a traditional sauna atmosphere. However, they require a chimney, good ventilation, and access to wood. Installation is more complex than for electric heaters, but the effect and atmosphere of the sauna often make up for the effort.
5. Gas heaters – efficient and economical
Gas heaters are characterized by fast heating and lower operating costs, especially with intensive sauna use. They require a gas installation and appropriate safety measures, so it's best to consult a specialist about their selection.
6. What else to remember when choosing a heater
Control – modern heaters offer electronic or app control, providing greater convenience and precision in settings.
Amount of stones – a larger quantity of stones produces gentler steam and maintains temperature longer.
Power supply – more powerful electric heaters (>6 kW) may require three-phase power (400 V).
Safety – ensure the heater has appropriate certifications and that the installation has been carried out according to the manufacturer's instructions.
Summary
The choice of a sauna heater should begin with determining the type of sauna and its volume, then matching the power and type of heater to the user's expectations. Electric heaters are the most convenient and easiest to operate, wood-burning heaters offer a traditional atmosphere, and gas heaters can be an economical alternative with proper installation. A well-chosen heater guarantees comfortable sessions and many years of trouble-free use.