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Combi and Bi-O sauna heaters have an integrated vaporizer, so one sauna can offer both a dry Finnish sauna and a humid mode. The vaporizer raises humidity, and the humid mode usually runs at a lower temperature for a gentler sauna. Finnish manufacturers use the name Combi, while EOS calls these heaters Bi-O. Read more
How to choose a Combi or Bi-O heater
Output and sauna volume
As with a standard heater, output is chosen according to the sauna's volume and wall materials. The manufacturer specifies the room size for each model.
Vaporizer
The vaporizer has a water tank that is filled before a humid session. Check the tank size and how easy it is to fill and clean. Some vaporizers can also be used with fragrances.
Control panel
A Combi or Bi-O heater requires a control panel that operates both the heater and the vaporizer. A standard dry sauna control panel is not suitable.
Electrical connection
The heater and vaporizer are connected according to the manufacturer's requirements. Installation must be carried out by a qualified electrician.
Find compatible panels in our Combi & Bi-O sauna control panels category. If you do not need a humid sauna, choose a Finnish (dry) heater. Contact us with your sauna dimensions and we will help you choose the heater and control panel.
Frequently asked questions
Can I use a Combi heater for a regular dry sauna?
Yes. You can leave the vaporizer off and enjoy a classic dry sauna.
What is the difference between Combi and Bi-O?
Both are sauna heaters with a vaporizer. Combi is the name used by Finnish manufacturers, Bi-O by EOS.
Do I need a special control panel?
Yes. You need a panel that controls both the heater and the vaporizer.
Does the vaporizer need cleaning?
Yes. Water leaves limescale deposits, so the tank should be cleaned regularly according to the manufacturer's instructions.
Information last checked 2026-11-03
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