Heater database · Helo
Helo Roxx 90
Helo Roxx 90 is a 9 kW electric heater rated for sauna rooms of 318–459 ft³ (9–13 m³). Wall-mounted, open stone design.
9 kW37.5 A at 240 V · 13.0 A per phase at 400 V
318–459 ft³rated room · 9–13 m³
–stone load: see the manual
50 Atypical 240 V breaker (125% rule); check the manual
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 | ✓ Rated for this room | 43 min |
| 7 × 8 ft | 451 ft³ | ✓ Rated for this room | 53 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
- HUUM Drop 99 kW · 283–460 ft³
- Saunum Air L 109.9 kW · 283–494 ft³
- HUUM Hive Mini 99 kW · 282–530 ft³
Source
Rated room range from Helo'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.