A versatile soapstone heater offers soft steam
When acquiring a new sauna heater, have you remembered to consider your own sauna preferences?
Soapstone sauna heaters has practically become legendary among lovers of the Finnish sauna, but do you know how a soapstone sauna heater differs from other electric heaters? Mondex soapstone sauna heaters feature an exterior with a generous amount of soapstone, which heats up evenly across the entire surface. When water is thrown onto the heater, it flows along the broad soapstone surface and vaporizes into oxygen‑rich, soft, humid, and long‑lasting steam. The heater’s carefully engineered structure, combined with its large soapstone surface area, guarantees wonderfully gentle steam that you would gladly enjoy day after day.
In addition to the unparalleled soft steam of soapstone heaters, soapstone heaters are also versatile and suitable for many types of saunas. If desired, the heater can be recessed into the bench construction, freeing up more space on the bench. For recessing, you only need to purchase the optional recess collar. The installation of a soapstone heater in the sauna is also simplified by the fact that the heater is mounted directly against the wall, eliminating the need for a safety distance behind the heater. Furthermore, all the weight of a soapstone heater rests on its feet, meaning the wall does not need to be reinforced for the heater installation. Consequently, soapstone heaters are suitable for saunas of various shapes and sizes.
When it began operations, Mondex was the world’s first manufacturer of soapstone sauna heaters, and the very first heaters in its long history were indeed soapstone models. Over the years, we have refined the technology and design of our soapstone heaters to perfection. As time has passed, our heater range has expanded to include other types of sauna heaters as well, but even today our selection still includes four traditional and original soapstone heaters Ahti, Ukko, Louhi and Hiisi. Ukko, Hiisi, and Louhi showcase the rugged beauty of soapstone, while Ahti’s soapstone surface, featuring carved water grooves, is smooth and even. Ahti and Ukko are models equipped with mechanical controls, whereas the Louhi and Hiisi heaters feature smart control electronics that ensure the sauna is heated to the optimal temperature every time. Best of all, all of our soapstone sauna heaters, like all Mondex heaters, are Key Flag–marked products manufactured in Finland.

Soapstone sauna heater in a nutshell
What is a soapstone sauna heater?
A soapstone sauna heater is an electric sauna heater that uses soapstone on its outer surface.
Why choose a soapstone heater?
One of the most important characteristics of a soapstone sauna heater is its soft steam, making it particularly well suited for those who enjoy gentle and humid sauna experiences.
What kind of sauna is a soapstone heater suitable for?
A soapstone sauna heater is suitable for virtually any sauna when an electric heater is desired. The soapstone heater is installed against the wall, but its weight rests on its legs, so no wall reinforcement is required. If desired, a soapstone heater can also be integrated into the sauna bench structure.
What types of soapstone sauna heaters exist?
Mondex's selection includes four different soapstone heaters: Ahti, Ukko, Louhi and Hiisi. Of these, Ahti and Ukko are sauna heaters equipped with traditional mechanical controls, while Louhi and Hiisi use smart control electronics. The soapstone used in the Ahti heater, featuring carved water grooves, has a smooth finish, whereas the soapstone in Ukko, Louhi, and Hiisi has a beautifully rugged surface. Mondex soapstone sauna heaters are available in several different power ratings, ranging from 6 kW to 9 kW.
How to choose a suitable sauna heater?
You can find out which sauna heater, such as a soapstone heater, is right for your sauna, try our heater selector. Just enter your sauna details, and the sauna selector will show you which of our heaters are suitable for your sauna. You will make the final choice yourself!