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 Low Profile (Small)
Harvia M3 wood-burning heater and Kuuma Low Profile (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 Low Profile (Small) |
|---|---|---|
| Heater output | 16.5 kW | — |
| Room size it is rated for | 212–459 ft³ (about 6–13 m³, our conversion) | 336–448 ft³ (about 9.5–12.7 m³, our conversion) |
| Fuel | Wood-burning | Wood-burning |
| Stone capacity | 66.2 lb | 150-250 lb |
| Mounting | Floor | — |
| Dimensions | H 27.95 in x W 15.35 in x D 17.72 in | H 26 in x W 23 in |
| Weight | 97.5 lb | 275 lb |
| Water tank | Optional pipe-model water heater | — |
| Glass door | Yes | Yes |
| Flue / chimney diameter | — | 6 in |
| Price on the maker's site | — | $2,795 (lamppakuuma.com, 23 Sep 2026) |
Each figure is the maker's own, as cited row by row on the M3 wood-burning heater and Low Profile (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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Amazon
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Buy from Kuuma: Low Profile (Small)
Kuuma's own page for the Low Profile (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). Low Profile (Small): 336–448 ft³ (about 9.5–12.7 m³, our conversion).
- Stone capacity: M3 wood-burning heater: 66.2 lb. Low Profile (Small): 150-250 lb.
- Dimensions: M3 wood-burning heater: H 27.95 in x W 15.35 in x D 17.72 in. Low Profile (Small): H 26 in x W 23 in.
- Weight: M3 wood-burning heater: 97.5 lb. Low Profile (Small): 275 lb.
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); water tank (only Harvia's cited pages give it); flue / chimney diameter (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 Low Profile (Small)
Kuuma · wood-burning · rated for 336–448 ft³ (about 9.5–12.7 m³, our conversion)