Heater database · HUUM
HUUM Drop 9
HUUM Drop 9 is a 9 kW electric heater rated for sauna rooms of 283–460 ft³ (8–13 m³). Wall-mounted, open stone design.
9 kW37.5 A at 240 V · 13.0 A per phase at 400 V
283–460 ft³rated room · 8–13 m³
121 lbstones · 55 kg
50 Atypical 240 V breaker (125% rule); check the manual
Affiliate link. Heaters are listed by fit, not by commission.
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 | ✓ Rated for this room | 44 min |
| 6 × 7 ft | 353 ft³ | ✓ Rated for this room | 49 min |
| 7 × 8 ft | 451 ft³ | ✓ Rated for this room | 59 min |
| 8 × 8 ft | 507 ft³ | Too small for this room | – |
| 8 × 10 ft | 619 ft³ | Too small for this room | – |
Similar heaters from other brands
- Harvia Vega BC90E9 kW · 283–494 ft³
- Helo Roxx 909 kW · 318–459 ft³
- Tulikivi Usva M 858.5 kW · 247–459 ft³
- Saunum Air L 109.9 kW · 283–494 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.