Guide
Wood-burning sauna stove size
Wood stoves are rated by the room volume they can heat, not by kilowatts. Calculate the room's effective volume first, then pick a stove whose range includes it.
Calculate the effective volume
Use the same correction as for electric heaters: add 1.2 m³ for every m² of glass or masonry, and multiply by 1.5 for solid log or uninsulated walls. The calculator does this when you choose Wood-burning.
Rated ranges for common stoves
| Stove | Rated room volume | Stones |
|---|---|---|
| Harvia M3 | 6–13 m³ (212–459 ft³) | 30 kg |
| Harvia Legend 150 | 6–13 m³ (212–459 ft³) | 120 kg |
| Harvia Pro 20 | 8–20 m³ (283–706 ft³) | 40 kg |
| HUUM Hive Wood 13 | 6–13 m³ (212–459 ft³) | 90 kg |
| HUUM Hive Wood 17 | 8–16 m³ (283–565 ft³) | 130 kg |
| Kastor Karhu 20 | 7.985343214015693–19.87840757531566 m³ (282–702 ft³) | 32 kg |
| Kastor Saga 22 | 11.978014821023539–22.00216906840494 m³ (423–777 ft³) | null kg |
| IKI Original | 14–30 m³ (494–1059 ft³) | 300 kg |
| Narvi Aito AK-47 | 8–12 m³ (283–424 ft³) | 60 kg |
| Narvi Aito AK-57 | 9–20 m³ (318–706 ft³) | 90 kg |
| Narvi Aito AK-57K | 11–23 m³ (388–812 ft³) | 130 kg |
| Narvi Aito 68 | 14–26 m³ (494–918 ft³) | 200 kg |
| Narvi Aito 78 | 19–30 m³ (671–1059 ft³) | 240 kg |
Heat-storing stoves
The Narvi Aito stoves in the table are heat-storing: you fire them once before bathing and the large stone mass gives löyly for hours with the fire out. See smoke saunas and heat-storing stoves.
Before you buy
- A wood stove needs a certified chimney and the manufacturer's safety distances to walls and benches.
- Place a fresh-air inlet low and close to the stove so it gets combustion air.
- Heavier stone loads give softer steam but take longer to heat.
- Indoor wood stoves are restricted by many building codes and insurers; check before planning one.