Finnish heaters
Combi & Bi-O heaters
Heat-Storing heater
Tulikivi heaters
EOS heaters
IKI heaters
Huum heaters
Harvia heaters
Narvi heaters
Heater accessories
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Heat-storing electric sauna heaters are designed for those who want their sauna ready at any time. A large stone mass stores heat, and the insulated casing with a lid keeps it in, so the stones stay hot for a long time. Simply open the lid and pour water on the stones for soft, humid steam. Read more
How does a heat-storing heater differ from a standard one?
A standard electric heater is heated up before every sauna session. A heat-storing heater has a much larger stone capacity and a closed, insulated stone compartment, so it stores heat and retains it longer. The large stone mass produces soft, even steam, similar to a traditional sauna.
Benefits of heat-storing heaters
Always ready
Some models offer a standby or ECO mode that keeps the stones at a lower temperature, so the sauna can be ready for use quickly.
Soft steam
The large stone mass provides soft, even steam even at lower sauna temperatures.
Safe to use
The insulated casing and lid reduce the hot surface area, making the heater safer for family saunas. Safety distances to walls and benches are specified by the manufacturer.
How to choose a heat-storing sauna heater
Output and sauna volume
Output is chosen according to the sauna's volume. Heat-storing heaters work best in well-insulated saunas. Concrete, natural stone, glass or solid log walls absorb more heat, so such saunas may need a more powerful heater and a longer heat-up time.
Electrical connection
Most heat-storing heaters require a three-phase supply. The manufacturer specifies the exact requirements, and the connection must be made by a qualified electrician.
Stones
Heat-storing heaters require a large amount of stones; the size and quantity are specified by the manufacturer. Stones are usually sold separately.
Harvia Forte and Helo Rondo
In this category you will find heat-storing heaters from leading Finnish manufacturers. The Harvia Forte is a floor-standing heater with a separate control panel that can also be integrated into a bench. The Helo Rondo is a round heater with a lid that rotates 360 degrees, so you can pour water from any side.
Not sure which output you need? Contact us with your sauna dimensions and wall materials and we will help you choose the right model.
Frequently asked questions
Does a heat-storing heater need to stay on all the time?
Not necessarily. You can switch it on before your sauna session, or use the standby / ECO mode if the model has one and you want the sauna ready quickly.
Can I pour water on a heat-storing heater?
Yes. Water is poured onto the stones after opening the heater lid.
Is a heat-storing heater suitable for a Finnish sauna?
Yes. These heaters have no vaporizer and are designed for a traditional Finnish sauna with soft steam.
Are stones included?
Usually not. The required amount and size of stones are specified by the manufacturer and shown in the product description.
Information last checked 2026-11-03
Price
Pirties tūris
Galia (kW) iki
Stone capacity, kg: Min - Max
