Sauna Heaters

A sauna heater works by heating specially selected sauna stones, which absorb and store the heat before gradually radiating it throughout the sauna. Once the stones reach the desired temperature, pouring water over them creates a burst of soft steam, known as löyly, increasing the humidity and making the heat feel more intense.

Electric sauna heaters warm the stones using built-in heating elements, while wood-burning sauna heaters use the heat from a fire beneath the stone chamber. Although the heat source differs, both work on the same principle; heated sauna stones provide consistent warmth and produce steam whenever water is poured over them, creating an authentic sauna experience.

Choosing the correct size sauna heater is essential for achieving efficient, consistent heat and the best possible sauna experience. As a general guide, electric sauna heaters require around 1kW of power for every cubic metre of sauna space. Wood-burning sauna heaters are instead designed to heat a specific range of sauna volumes, so selecting the right model depends on the size of your sauna room.

It's also important to consider factors such as glass panels, insulation, ceiling height and whether your sauna is located indoors or outdoors, as these can all influence the heating capacity required. These factors represent additional heat loss from the sauna space and are accounted for by adding multipliers to the sauna's physical volume. The final figure, after all relevant factors have been considered, is known as the computational volume.

Every product page includes the recommended sauna size for each heater, and if you're unsure, our expert team is always on hand to help you choose the right model.

Both electric and wood-burning sauna heaters create an authentic sauna experience, so the right choice depends on your space, lifestyle and personal preference.

Electric sauna heaters are the most popular option for home saunas, offering fast heat-up times, precise temperature control and minimal maintenance. Many models also feature timers, remote controls or Wi-Fi connectivity for added convenience. They are suitable for both indoor and outdoor saunas, although larger heaters may require a three-phase electrical supply.

Wood-burning sauna heaters offer a more traditional experience, combining the gentle warmth and ambience of a real fire with beautifully soft löyly. They are particularly well suited to outdoor sauna cabins, barrel saunas and off-grid locations, as they don't require a mains electricity supply. However, they do require a chimney or flue, appropriate clearances and a little more hands-on operation.

At Finnmark, we offer a carefully curated selection of electric and wood-burning sauna heaters from leading brands, including Narvi, HUUM, Helo, IKI and Tulikivi. If you're unsure which option is best for your project, our expert team will be happy to help you choose the right sauna heater.

Choosing the right sauna heater depends on the size of your sauna, how well it is insulated, whether it is located indoors or outdoors, how often it will be used, and whether it is intended for domestic or commercial use.

You'll also need to consider the appropriate heat output for your sauna's volume, along with the features that matter most to you, such as Wi-Fi control, a larger stone capacity or a particular design aesthetic. For commercial installations, it's important to choose a heater engineered for frequent, intensive use.

A correctly specified sauna heater will heat your space efficiently, maintain a consistent temperature and produce the soft, balanced löyly that defines an exceptional sauna experience. If you're unsure which model is right for your project, our Sauna Heater Buyer's Guide and expert team are always on hand to help.

The best sauna heater for a home sauna depends on the size of your sauna, where it is located and the type of sauna experience you want to create. Electric sauna heaters are the most popular choice for home installations, offering fast heat-up times, precise temperature control and straightforward operation. For outdoor home saunas, garden rooms and barrel saunas, a wood-burning sauna heater can provide a more traditional experience with the warmth, ambience and ritual of a real fire.

Whatever your preference, choosing a high-quality sauna heater ensures efficient performance, consistent temperatures and years of reliable operation. At Finnmark, we've carefully curated a range of premium sauna heaters from leading manufacturers, helping you find the perfect heater for your home sauna.

The best sauna heater brands combine decades of engineering expertise with outstanding build quality and reliable performance. That's why we only work with respected sauna heater manufacturers including Narvi, HUUM, Tulikivi, Helo, Kastor and IKI. Each brand offers its own distinctive design and heating characteristics, allowing you to choose a heater that perfectly suits your sauna and the experience you're looking to create.