Heater calculator

Find the perfect heater for your sauna

Calculating sauna volume and determining the required heater output

The volume of your sauna determines the heater power you need — and choosing the right heater for your sauna is key to a truly great sauna experience. A heater with the right size and power guarantees perfect steam and makes heating more energy-efficient. Use our heater calculator to easily find the ideal electric heater power for your sauna.

SAUNA SIZE

WIDTH (m)

DEPTH (m)

HEIGHT (m)

WALL SURFACE INSULATION

Glass, stone, concrete, log and tiled surfaces absorb heat.

GLASS, STONE OR CONCRETE SURFACE AREA (m²)

LOG STRUCTURE ? Default assumption: a modern, airtight log structure. More open/less airtight structures require more heating output.

CALCULATED SAUNA VOLUME FOR
DETERMINING REQUIRED OUTPUT:

--.- m³

Take into account unusually high ceilings or exceptionally large cold surfaces in the sauna.

Recommended heaters

Results are based on your calculated required output. Narrow down the options using filters as needed.

Sauna heaters

Electric sauna heaters

Wood-burning heaters

Floor-standing heaters

Wall-mounted sauna heaters

Soapstone sauna heaters

WiFi-enabled sauna heaters

Kalla 2.0

Designed for compact saunas.

Kalla 2.0 is designed to meet the needs of today’s sauna users. Its clean design, refined details and improved user experience make it a natural choice for modern saunas. The timeless appearance ensures Kalla 2.0 to fit seamlessly into both new saunas and renovation projects.

Available power ratings (kW)

6,6

9,0

Available models

E2 WiFi

Remote controller

Electronic controller

Find out more about the heater

Teno 2.0

A stylish wall-mounted heater for a wide range of saunas.

Mondex Teno 2.0 is an updated version of our popular Teno heater. With its fast heating, energy efficiency, and more refined design, it is an excellent choice for saunas of various sizes, offering versatile steam from soft to more intense.

Available power ratings (kW)

6,6

9,0

Available models

E2 WiFi

Remote controller

Electronic controller

Mechanical controller

Find out more about the heater

Rakka

Unique design heater.

Mondex Rakka‘s patented structure emphasizes the natural rough beauty of the stones. The heater has no net, so water can be thrown anywhere on it. Thanks to its structure and the large stone capacity, you get to enjoy a long-lasting and moist steam, just like in a wood-burning sauna. 

Available power ratings (kW)

6,6

9,0

10,5

Available models

E2 WiFi

Remote controller

Electronic controller

Mechanical controller

Find out more about the heater

Tahko

An affordable heater for a wide range of saunas.

Mondex Tahko is a popular and versatile floor heater with several different power ratings. Thanks to the open outer casing, you can vary the quality of the steam from gentle and moist to hotter by throwing the steam on different parts of the stove.

Available power ratings (kW)

6,6

9,0

10,5

Available models

E2 WiFi

Remote controller

Electronic controller

Mechanical controller

Find out more about the heater

Kaira

A versatile floor heater that is easy to embed in the sauna bench.

Looking for a stylish built-in sauna heater? The Mondex Kaira is a versatile, 100 kg stone capacity floor heater that can be left freestanding or built into the benches without additional accessories. Thanks to its unique structure, the heater's safety distance to the bench is only 4 mm, meaning it barely leaves any visible gap in the bench when built-in. The Kaira's detachable top also makes changing sauna stones easier.

Available power ratings (kW)

6,6

9,0

Available models

E2 WiFi

Remote controller

Electronic controller

Find out more about the heater

Aura

Corner heater for efficient use of space in the sauna.

Mondex Aura is a modern and stylish corner heater that maximizes the space use in your sauna. The wall-mounted heater fits perfectly in the corner of your sauna, making efficient use of wasted space. As the heater stands on its own legs, there is no weight load on the wall, and it can also be recessed into the bench structures, leaving more space for the sauna.

Available power ratings (kW)

6,6

9,0

Available models

E2 WiFi

Remote controller

Electronic controller

Find out more about the heater

Kymi

A stylish, compact wall-mounted heater.

Mondex Kymi is a stylish and efficient wall-mounted heater available in 6 kW and 8 kW power classes. Kymi has small safety distances, making it possible to enjoy excellent steam even in compact sauna spaces. This clean-lined wall heater with a stylish perforated front panel combines modern design with easy manual control, making the sauna experience both enjoyable and effortless.

Available power ratings (kW)

6,0

8,0

Available models

Mechanical controller

Find out more about the heater

Ahti

The authentic, original soapstone heater.

Mondex Ahti combines sleek stainless steel and Finnish soapstone into a beautiful design. This genuine, original soapstone heater heats evenly up across its entire length and delivers moist, oxygen-rich steam – every time!

Available power ratings (kW)

6,0

8,0

Available models

Mechanical controller

Find out more about the heater

Ukko

The perfect combination of rough and smooth soapstone.

The Mondex Ukko soapstone heater is filled with domestic bedrock, soapstone. The combination of rough and smooth soapstone brings natural stone beauty to your sauna. At the same time, the soapstone heater provides moist, acid-rich baths, every time.

Available power ratings (kW)

6,0

8,0

Available models

Mechanical controller

Find out more about the heater

Louhi

The queen of indulgent sauna experience.

Rough Finnish soapstone and advanced technology come together in this elegant heater, making Mondex Louhi the right choice when you want to enjoy your sauna to the maximum. It heats up to its full size and delivers moist, oxygen-rich steam – every time! 

Available power ratings (kW)

6,6

9,0

Available models

E2 WiFi

Remote controller

Electronic controller

Find out more about the heater

Hiisi

Nobility of soapstone heaters.

Mondex Hiisi is the king of enjoyable baths. It combines Finnish rough soapstone, elegant black granite and advanced technology. The renowned soapstone stove heats up to its full size and delivers moist, acid-rich baths every time.

Available power ratings (kW)

6,6

9,0

Available models

E2 WiFi

Remote controller

Electronic controller

Find out more about the heater

Klapi

A wood-burning heater with a beautiful design.

Mondex Klapi is a small, Finnish-made wood heater that combines the traditional sauna experience with a modern and efficient design. Its compact size makes it an ideal choice for small saunas where space is limited but you don't want to compromise on quality. Mondex Klapi is suitable for saunas from 8 to 16 m³. You can easily find out the calculated volume of your sauna using the heater selector.

Find out more about the heater

Motti

Modern wood-burning heater for home or cottage.

Mondex Motti’s generous 60 kg stone capacity stores heat efficiently, providing soft and pleasant sauna steam. The flickering fire visible through the glass door of the firebox creates a particularly atmospheric sauna experience. The door can be configured for either left- or right-handed opening to suit individual needs.

Find out more about the heater

Motti wood-burning heater with water tank black front

Motti with water tank

Modern wood-burning sauna heater with a water tank for home or cottage.

Mondex Motti’s generous 60 kg stone capacity stores heat efficiently, providing soft and pleasant sauna steam. The heater is an excellent choice especially for saunas that do not have a separate shower room. Water in the wood-burning heater’s built-in water tank is heated at the same time as the sauna. The water tank can be installed on either the right or left side of the heater, and the firebox door can be configured for either left- or right-handed opening to suit individual needs.

Find out more about the heater

Power classes

6.0 kW

6.6 kW

8.0 kW

9.0 kW

10.5 kW

Wood-burning heaters

Tilavuus (m3) - slider

Tilavuus (m3) - inputs

Sauna heaters

Stone radiators