Sauna heater

Sauna oven: what kW power is required?

The size of the sauna is crucial for the selection of the optimal sauna heater. From our many years of experience, we recommend heaters with the following output:

• Sauna size between 3 and 6 m³ = > sauna heater with 4.5 kW capacity
• Sauna size between 5 and 9 m³ = > sauna heater with 6.0 kW capacity
• Sauna size between 8 and 11 m³ = > sauna heater with 8.0 kW capacity
• Sauna size between 10 and 12 m³ = > sauna heater with 9.0 kW capacity

If the glass content of the sauna is high, however, a sauna heater with higher performance may have to be chosen. When planning a sauna, we advise you on the right selection. In general, a distinction is made in the sauna heaters between an oven suspended on the sauna wall (wall-hanging oven), a free-standing oven (e.g. in front of a glass front) or a rear wall furnace (hidden oven behind the sauna wall). We match the selection of the right oven to the sauna design.

Which power connection is required for the sauna oven?

For a high-performance sauna oven, high current with 400 V is basically required. Here you will find detailed information: Sauna planning: electricity connection and cables >

Tip: free-standing sauna heater

If your sauna has a glazed corner, a free-standing sauna heater is particularly fine. In order to ensure that no visible connection cables disturb the perfect optics at the end, we recommend – if feasible – to lead an empty pipe under the screed to the planned heater position in good time during construction. Please contact us early if you are planning your house construction or conversion, so that the power connections and cables can already be laid appropriately.

Bio sauna: What is a combi sauna heater?

It is not only the kW performance of the oven that matters – it is also crucial how you want to use your sauna: a normal sauna heater is sufficient for the Finnish sauna (approx. 90 °C/10 % humidity). If you also want to use your sauna as a bio sauna (approx. 60 °C/40 % humidity), the sauna heater must be equipped with an evaporator. This is then a so-called combi heater or combined sauna oven. With the water vapor from the evaporator, the humidity in the sauna is increased. With a combi heater you are completely flexible: the evaporator can be switched on or off, i.e. you can sauna with it in the Finnish way, but also use the sauna cabin as an bio sauna on another day.

In the case of a bio sauna, it should be noted that exhaust air is necessary to actively guide the moisture from the sauna to the outside after sauna use (to avoid mould formation). All information about the sauna forms can be found here >

Replacing the sauna heater

You already have a sauna and would like to retrofit your sauna heater…? On request, corso also provides you with a new sauna heater or a new sauna control system if your previous model is defective or if you want to upgrade to a newer model (whether your existing sauna was built by corso or not or if you want to build your own sauna DIY). In view of the large selection, we recommend you to talk to us in advance, so that we can offer you the most suitable technology for your sauna. We are looking forward to the conversation! CONTACT >

Changing sauna stones

The sauna stones should be renewed after 3 to 6 years, but at the latest if they become brittle or start to smell. Otherwise, small splinters could damage the heating rods of your oven. Order new sauna stones: SHOP >

Further information on sauna planning:

How do I plan an indoor sauna?
How do I plan an outdoor sauna?
What materials are used for sauna construction?

In addition, these questions were placed:

Which electricity connection for sauna?
Which cable for sauna?
How often do sauna stones need to be changed?