Sauna Heater Sizing with SaunaSizer AI™
The returned heater must be in "as-new" condition with all parts and manuals.
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HUUM DROP Electric Sauna Heater | 4.5, 6, 7.5 & 9 kW
HUUM DROP combines a wall-mounted, water-drop form with 122 lb of exposed stones for soft, abundant steam. This is the latest current U.S. generation, with HUUM’s reflector, heat diverter, element retainers, and element spacers included. Choose 4.5, 6, 7.5, or 9 kW for adjusted sauna volumes from 106 to 460 cubic feet.
Build your complete DROP system. Every new installation needs three components: the DROP heater, a HUUM UKU controller, and 122 lb of 2–4 inch sauna stones. We’ve preselected the most popular Wi-Fi controller and the correct stones. Your complete subtotal updates below.
HUUM HIVE Wood-Burning Sauna Stove | 13, 17 & 17 LS
HUUM HIVE Wood surrounds a heavy firebox with 199 to 287 lb of stones, bringing gentle, water-rich steam to off-grid and wood-fired saunas from 212 to 565 cubic feet. Choose 13 kW, 17 kW, or 17 LS with an extended firebox for feeding from an adjacent room. Stones and a code-compliant chimney system are required and sold separately.
HUUM HIVE Electric Sauna Heater with Included Air Tunnel | 12, 15 & 18 kW
Full-size HUUM HIVE is built around 528 lb of stones for large residential and commercial-style sauna rooms from 424 to 989 cubic feet. The current 2025+ U.S. heater includes HUUM's stainless-steel air tunnel to improve airflow, support the elements, and help them last longer. UKU control, UKU Extension Box, and sixteen 33-lb boxes of 2 to 4-inch stones are required and sold separately.
HUUM HIVE Electric Sauna Heater with Included Air Tunnel | 12, 15 & 18 kW
Full-size HUUM HIVE is built around 528 lb of stones for large residential and commercial-style sauna rooms from 424 to 989 cubic feet. The current 2025+ U.S. heater includes HUUM's stainless-steel air tunnel to improve airflow, support the elements, and help them last longer. UKU control, UKU Extension Box, and sixteen 33-lb boxes of 2 to 4-inch stones are required and sold separately.
HUUM HIVE Heat Wood Stove - Legacy / Installed-Base Reference
Legacy HUUM HIVE Heat listing retained for installed-base identification and replacement-parts support. This family is not present in the current U.S. distributor sellable catalog. For a new wood-burning installation, compare the current HIVE Flow and HIVE Wood families.
HUUM STEEL Electric Sauna Heater | 6, 9 & 10.5 kW
HUUM STEEL is a slim floor-standing stainless-steel heater with 330 lb of stones for gentle, long-lasting steam. Choose 6, 9, or 10.5 kW for current U.S. room ranges from 177 to 566 cubic feet. UKU control and 1 to 2-inch sauna stones are required and sold separately.
Still Not Sure?
Sizing an Electric Sauna Heater
Manufacturers 'rule of thumb' guides for sizing electric sauna heaters range 1 KW for every 35 and 50 cubic meters of space. We started training SaunaSizer with 1 KW for every 45 cubic feet and it has made thousands of adjustments based on real life tests.
But there's much more to consider. Glass surfaces, stone walls, windows, and other uninsulated surfaces (including uninsuated walls) need to be factored in. SaunaSizer uses thermal resistance of materials, climate data of the location, and user experiences to personalize recommendations.
The square footage of uninsulated space should be given an effective value between 5% and 50% higher, depending on the surface.
The location also needs to be included if the sauna will be outdoors. Cold climates like Canada, Alaska, Minnesota, and Finland require an additional 25% added to the entire calculation. SaunaSizer determines this based on climate.
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