Heater database · HUUM
HUUM Hive 18
HUUM Hive 18 is an 18 kW electric heater rated for sauna rooms of 636–989 ft³ (18–28 m³). Floor-standing, very large stone capacity.
18 kW75.0 A at 240 V · 26.0 A per phase at 400 V
636–989 ft³rated room · 18–28 m³
551 lbstones · 250 kg
100 Atypical 240 V breaker (125% rule); check the manual
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Rooms it fits
Indoor rooms with insulated walls, a 7 ft ceiling and a glass door, which counts extra. Warm-up is from 68 °F to 176 °F, estimated with the calculator's model. For your own room, glass, masonry or log walls, use the calculator.
| Room | Counts as | Fit | Warm-up |
|---|---|---|---|
| 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 | Too big for this room | – |
| 8 × 8 ft | 507 ft³ | Too big for this room | – |
| 8 × 10 ft | 619 ft³ | Too big for this room | – |
Similar heaters from other brands
- Saunum Air L 1515 kW · 530–812 ft³
Source
Rated room range and stone load from HUUM'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. Photo: HUUM, used with permission.