Rated for a bigger room: Kuuma Classic Legacy (Small)
Kuuma rates it for 336–512 ft³ (about 9.5–14.5 m³, our conversion); Harvia rates the Legend 150 wood-burning heater for 6–13 m³ (about 212–459 ft³, our conversion).
A 16 kW wood-burning sauna stove from Harvia, rated by the maker for 6–13 m³ (about 212–459 ft³, our conversion). Every figure below is Harvia's own, linked to where it is published.
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As published by Harvia, read on 2026-09-22. Makers revise their products; check Harvia'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); Harvia rates the Legend 150 wood-burning heater for 6–13 m³ (about 212–459 ft³, our conversion).
Side by side with the HUUM HIVE Wood 13. The makers of both wood-burning stoves publish rated room sizes that overlap.
Side by side with the Kuuma Classic Legacy (Small). Both wood-burning stoves are rated by their makers for at least some of the same room sizes.
Side by side with the Kuuma Low Profile (Small). Both wood-burning stoves are rated by their makers for at least some of the same room sizes.
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)
HUUM · wood-burning · 13 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)
Harvia lists 16 kW. Related question: What size sauna heater do I need?
Source: Wood burning heater Harvia Legend 150 black | Wood burning heaters | Harvia
Harvia 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?
Source: Wood burning heater Harvia Legend 150 black | Wood burning heaters | Harvia
Harvia lists: Optional pipe-mounted water heater.
Source: Wood burning heater Harvia Legend 150 black | Wood burning heaters | Harvia
More from Harvia: all Harvia products on Saunakivi.