HUUM
HUUM Hive Flow wood-burning sauna stove
HUUM makes the Hive Flow wood stove in 4 versions for saunas of 212 ft³ to 636 ft³. Slide to your room size to see which one fits and how fast it heats.
Updated Oct 17, 2026
Output
8.5–9.8 kW
Rooms
212 ft³–636 ft³
Stones
231 lb–331 lb
Sizes
4
Which size fits your sauna?
Your room's effective volume
353 ft³
Best fit: Mini
Work out your effective volumeEffective volume = inside volume, plus 1.2 m³ for every m² of glass, tile or stone; × 1.5 for solid log walls (Harvia's rule, used by most planners).
Sizes and specifications
| Model | Output | Room range | Stones | Heat-up | Firewood per session |
|---|---|---|---|---|---|
| HIVE Flow Mini | 8.5 kW | 212 ft³–494 ft³ | 231 lb | 1.7–2.3 h | 12 lb |
| HIVE Flow Mini LS | 8.5 kW | 212 ft³–494 ft³ | 231 lb | 1.7–2.3 h | 12 lb |
| HIVE Flow | 9.8 kW | 283 ft³–636 ft³ | 331 lb | 2–2.8 h | 16 lb |
| HIVE Flow LS | 9.8 kW | 283 ft³–636 ft³ | 331 lb | 2–2.8 h | 16 lb |
Heat-up and cost are our heat model's estimate for each size in a room at the middle of its range: indoor, insulated walls, 68 °F around the sauna, heated to 176 °F, one hour of bathing, electricity at $0.18/kWh (United States average).
Where to see it
Prices and availability come from the shop or maker and change; their page is what counts. Shop offers are added as retailers join.
Sources
- huum.eu/product/hive-flow-wood-burning-stove/maker · read 2026-10-17
- huumsauna.com/product/hive-flow-wood-burning-stove/maker · read 2026-10-17
Other heaters for the same rooms
Questions and answers
What size sauna does the HUUM Hive Flow heat?
HUUM rates the sizes for these rooms: HIVE Flow Mini 212 ft³–494 ft³; HIVE Flow Mini LS 212 ft³–494 ft³; HIVE Flow 283 ft³–636 ft³; HIVE Flow LS 283 ft³–636 ft³. Use your room's effective volume: add 1.2 m³ for every m² of glass, tile or stone, and multiply by 1.5 for solid log walls.
How long does the HUUM Hive Flow take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: HIVE Flow Mini 1.7–2.3 h; HIVE Flow Mini LS 1.7–2.3 h; HIVE Flow 2–2.8 h; HIVE Flow LS 2–2.8 h to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the HUUM Hive Flow take?
As stated by HUUM: HIVE Flow Mini 231 lb; HIVE Flow Mini LS 231 lb; HIVE Flow 331 lb; HIVE Flow LS 331 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.