Heater database · Kastor
Kastor Karhu 22
Kastor Karhu 22 is a wood-burning stove rated for sauna rooms of 424–777 ft³ (12–22 m³). Classic Finnish steel stove; water-tank (VV/VO) and through-wall (T) versions.
WoodWood-burning stove
424–777 ft³rated room · 12–22 m³
66 lbstones · 30 kg
14 kWnominal output
Rooms it fits
Indoor rooms with insulated walls, a 7 ft ceiling and a glass door, which counts extra. Wood stoves are rated by room volume, not by kW. For your own room, glass, masonry or log walls, use the calculator.
| Room | Counts as | Fit |
|---|---|---|
| 4 × 5 ft | 199 ft³ | Too big for this room |
| 5 × 5 ft | 234 ft³ | Too big for this room |
| 5 × 6 ft | 269 ft³ | Too big for this room |
| 6 × 6 ft | 311 ft³ | Too big for this room |
| 6 × 7 ft | 353 ft³ | Too big for this room |
| 7 × 8 ft | 451 ft³ | ✓ Rated for this room |
| 8 × 8 ft | 507 ft³ | ✓ Rated for this room |
| 8 × 10 ft | 619 ft³ | ✓ Rated for this room |
Similar stoves from other brands
- HUUM Hive Wood 17283–565 ft³
- HUUM Hive Wood 13212–459 ft³
- Harvia Legend 150212–459 ft³
- Harvia M3212–459 ft³
Source
Rated room range and stone load from Kastor's product information, checked October 2026. Ranges are the manufacturer's calculated room volumes; check the manual for safety distances, and have a licensed electrician make the connection.