See it at Harvia: M3 wood-burning heater
Harvia's own page for the M3 wood-burning heater. Not a paid link.
M3 wood-burning heater vs Classic Legacy (Small)
Harvia M3 wood-burning heater and Kuuma Classic Legacy (Small), compared on the figures their makers publish. Both are wood-burning stoves, and the room sizes their makers rate them for overlap.
The makers' figures side by side
| Specification | Harvia M3 wood-burning heater | Kuuma Classic Legacy (Small) |
|---|---|---|
| Heater output | 16.5 kW | — |
| Room size it is rated for | 212–459 ft³ (about 6–13 m³, our conversion) | 336–512 ft³ (about 9.5–14.5 m³, our conversion) |
| Fuel | Wood-burning | Wood-burning |
| Stone capacity | 66.2 lb | 80-100 lb |
| Mounting | Floor | — |
| Dimensions | H 27.95 in x W 15.35 in x D 17.72 in | — |
| Weight | 97.5 lb | 375 lb |
| Water tank | Optional pipe-model water heater | Optional stainless steel water tank, 12 gallons (Setri "Cedar" Hot Water Package) |
| Glass door | Yes | Yes |
| Flue / chimney diameter | — | 6 in |
| Safety listing | — | UL 1482 (listed by PFS-TECO) |
| Price on the maker's site | — | $2,395 (lamppakuuma.com, 23 Sep 2026) |
Each figure is the maker's own, as cited row by row on the M3 wood-burning heater and Classic Legacy (Small) pages and listed in the sources below. A dash means the figure is not on the maker pages we cite. Figures marked "about" are Saunakivi's unit conversions of the maker's figure.
Where to buy
Harvia M3 wood-burning heater
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Buy from Kuuma: Classic Legacy (Small)
Kuuma's own page for the Classic Legacy (Small). Not a paid link.
Where the published figures differ
- Room size it is rated for: M3 wood-burning heater: 212–459 ft³ (about 6–13 m³, our conversion). Classic Legacy (Small): 336–512 ft³ (about 9.5–14.5 m³, our conversion).
- Stone capacity: M3 wood-burning heater: 66.2 lb. Classic Legacy (Small): 80-100 lb.
- Weight: M3 wood-burning heater: 97.5 lb. Classic Legacy (Small): 375 lb.
- Water tank: M3 wood-burning heater: Optional pipe-model water heater. Classic Legacy (Small): Optional stainless steel water tank, 12 gallons (Setri "Cedar" Hot Water Package).
Figures we cite for only one of the two: heater output (only Harvia's cited pages give it); mounting (only Harvia's cited pages give it); dimensions (only Harvia's cited pages give it); flue / chimney diameter (only Kuuma's cited pages give it); safety listing (only Kuuma's cited pages give it); price on the maker's site (only Kuuma's cited pages give it). Ask the other maker before treating the two as equal on those points.
Read each one in full
Harvia M3 wood-burning heater
Harvia · wood-burning · 16.5 kW · rated for 212–459 ft³ (about 6–13 m³, our conversion)
Kuuma Classic Legacy (Small)
Kuuma · wood-burning · rated for 336–512 ft³ (about 9.5–14.5 m³, our conversion)