Rated for a bigger room: Kuuma Classic Legacy (Small)
Kuuma rates it for 336–512 ft³ (about 9.5–14.5 m³, our conversion); HUUM rates the HIVE Wood 13 for 6–13 m³ (about 212–459 ft³, our conversion).
A 13 kW wood-burning sauna stove from HUUM, rated by the maker for 6–13 m³ (about 212–459 ft³, our conversion). Every figure below is HUUM's own, linked to where it is published.
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As published by HUUM, read on 2026-09-23. Makers revise their products; check HUUM's current specification before you buy. Figures marked "about" are Saunakivi's unit conversions of the maker's figure.
Kuuma rates it for 336–512 ft³ (about 9.5–14.5 m³, our conversion); HUUM rates the HIVE Wood 13 for 6–13 m³ (about 212–459 ft³, our conversion).
Side by side with the Harvia Legend 150 wood-burning heater. The makers of both wood-burning stoves publish rated room sizes that overlap.
Side by side with the Harvia M3 wood-burning heater. These wood-burning stoves carry maker room-size ratings that share part of the same range.
Side by side with the Kuuma Low Profile (Small). These wood-burning stoves carry maker room-size ratings that share part of the same range.
Harvia · wood-burning · 16.5 kW · rated for 212–459 ft³ (about 6–13 m³, our conversion)
Harvia · wood-burning · 24.1 kW · rated for 283–706 ft³ (about 8–20 m³, our conversion)
Harvia · wood-burning · 16 kW · rated for 6–13 m³ (about 212–459 ft³, our conversion)
HUUM · wood-burning · 9.8 kW · rated for 8–18 m³ (about 283–636 ft³, our conversion)
Kuuma · wood-burning · rated for 512–780 ft³ (about 14.5–22.1 m³, our conversion)
Kuuma · wood-burning · rated for 448–700 ft³ (about 12.7–19.8 m³, our conversion)
HUUM lists 13 kW. Related question: What size sauna heater do I need?
HUUM rates it for 6–13 m³ (about 212–459 ft³, our conversion). See our heater sizing guide for how makers adjust that figure for glass and uninsulated walls. Related question: Wood-burning sauna stoves: which room size is each rated for?
HUUM lists a stone capacity of 90 kg.
HUUM lists 115 mm. Flue and chimney work should follow the manual and local code.
HUUM lists: Optional heat exchanger below the stones.
HUUM lists: 3 years (private use); 1 year (commercial use).
Source: HUUM Limited Warranty Terms and Conditions (v4, ENG)
More from HUUM: all HUUM products on Saunakivi.