SAWO
SAWO Nimbus Combi sauna heater
SAWO makes the Nimbus Combi in 5 sizes, from 9 to 18 kW, for saunas of 283 ft³ to 1,024 ft³. Slide to your room size to see which one fits, how fast it heats and what it needs from your fuse box.
Updated Oct 18, 2026
Output
9–18 kW
Rooms
283 ft³–1,024 ft³
Stones
110 lb–165 lb
Sizes
5
Which size fits your sauna?
Your room's effective volume
494 ft³
Best fit: NIMC-120
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 | Per session |
|---|---|---|---|---|---|
| Nimbus Combi NIMC-90NIMC-90NS-PSteamer | 9 kW | 283 ft³–494 ft³ | 110 lb | 30–40 min | $1.56 |
| Nimbus Combi NIMC-105NIMC-105NS-PSteamer | 10.5 kW | 318 ft³–530 ft³ | 110 lb | 25–35 min | $1.58 |
| Nimbus Combi NIMC-120NIMC-120NS-PSteamer | 12 kW | 353 ft³–636 ft³ | 110 lb | 25–30 min | $1.79 |
| Nimbus Combi NIMC-150NIMC-150NS-PSteamer | 15 kW | 459 ft³–812 ft³ | 165 lb | 25–35 min | $2.30 |
| Nimbus Combi NIMC-180NIMC-180NS-PSteamer | 18 kW | 600 ft³–1,024 ft³ | 165 lb | 25–35 min | $2.71 |
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).
Electrical connection
| Output | three-phase 400 V (per phase) | single-phase 230 V |
|---|---|---|
| 9 kW | 13 A | 39.1 A |
| 10.5 kW | 15.2 A | 45.7 A |
| 12 kW | 17.3 A | 52.2 A |
| 15 kW | 21.7 A | 65.2 A |
| 18 kW | 26 A | 78.3 A |
Current is computed from the output; fuse and cable are shown where the maker or dealer states them. A licensed electrician sizes and installs the circuit following the heater's manual and local rules.
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
- sawo.com/nimbus-combi-ns/maker · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the SAWO Nimbus Combi heat?
SAWO rates the sizes for these rooms: Nimbus Combi NIMC-90 283 ft³–494 ft³; Nimbus Combi NIMC-105 318 ft³–530 ft³; Nimbus Combi NIMC-120 353 ft³–636 ft³; Nimbus Combi NIMC-150 459 ft³–812 ft³; Nimbus Combi NIMC-180 600 ft³–1,024 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.
What fuse or breaker does the SAWO Nimbus Combi need?
It depends on the size and your supply: Nimbus Combi NIMC-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; Nimbus Combi NIMC-105: 3~ 400 V: 15.2 A, 1~ 230 V: 45.7 A; Nimbus Combi NIMC-120: 3~ 400 V: 17.3 A, 1~ 230 V: 52.2 A; Nimbus Combi NIMC-150: 3~ 400 V: 21.7 A, 1~ 230 V: 65.2 A; Nimbus Combi NIMC-180: 3~ 400 V: 26 A, 1~ 230 V: 78.3 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the SAWO Nimbus Combi take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Nimbus Combi NIMC-90 30–40 min; Nimbus Combi NIMC-105 25–35 min; Nimbus Combi NIMC-120 25–30 min; Nimbus Combi NIMC-150 25–35 min; Nimbus Combi NIMC-180 25–35 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the SAWO Nimbus Combi take?
As stated by SAWO: Nimbus Combi NIMC-90 110 lb; Nimbus Combi NIMC-105 110 lb; Nimbus Combi NIMC-120 110 lb; Nimbus Combi NIMC-150 165 lb; Nimbus Combi NIMC-180 165 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.