SAWO
SAWO Phoenix sauna heater
SAWO makes the Phoenix in 9 sizes, from 4.5 to 18 kW, for saunas of 106 ft³ to 989 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
4.5–18 kW
Rooms
106 ft³–989 ft³
Stones
187 lb–287 lb
Sizes
9
Which size fits your sauna?
Your room's effective volume
406 ft³
- PNX3-454.5 kW
- PNX3-606 kW
- PNX3-757.5 kW
- PNX3-909 kW
- PNX6-909 kW
- PNX6-10510.5 kW
- PNX6-12012 kW
- PNX6-15015 kW
- PNX6-18018 kW
Best fit: PNX3-90
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 |
|---|---|---|---|---|---|
| Phoenix PNX3-45PNX3-45NS-P-C, PNX3-45Ni2-P-C | 4.5 kW | 106 ft³–212 ft³ | 187 lb | 80–105 min | $1.37 |
| Phoenix PNX3-60PNX3-60NS-P-C, PNX3-60Ni2-P-C | 6 kW | 177 ft³–318 ft³ | 187 lb | 55–80 min | $1.39 |
| Phoenix PNX3-75PNX3-75NS-P-C, PNX3-75Ni2-P-C | 7.5 kW | 247 ft³–459 ft³ | 187 lb | 55–75 min | $1.76 |
| Phoenix PNX3-90PNX3-90NS-P-C, PNX3-90Ni2-P-C | 9 kW | 283 ft³–494 ft³ | 187 lb | 45–60 min | $1.83 |
| Phoenix PNX6-90PNX6-90NS-P-C, PNX6-90Ni2-P-C | 9 kW | 283 ft³–530 ft³ | 287 lb | 60–80 min | $2.18 |
| Phoenix PNX6-105PNX6-105NS-P | 10.5 kW | 318 ft³–565 ft³ | 287 lb | 50–65 min | $2.28 |
| Phoenix PNX6-120PNX6-120NS-P | 12 kW | 388 ft³–636 ft³ | 287 lb | 45–60 min | $2.39 |
| Phoenix PNX6-150PNX6-150NS-P | 15 kW | 494 ft³–883 ft³ | 287 lb | 40–55 min | $2.89 |
| Phoenix PNX6-180PNX6-180NS-P | 18 kW | 636 ft³–989 ft³ | 287 lb | 35–45 min | $3.22 |
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 |
|---|---|---|
| 4.5 kW | 6.5 A | 19.6 A |
| 6 kW | 8.7 A | 26.1 A |
| 7.5 kW | 10.8 A | 32.6 A |
| 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/phoenix-ni2/maker · read 2026-10-18
- sawo.com/phoenix-ns/maker · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the SAWO Phoenix heat?
SAWO rates the sizes for these rooms: Phoenix PNX3-45 106 ft³–212 ft³; Phoenix PNX3-60 177 ft³–318 ft³; Phoenix PNX3-75 247 ft³–459 ft³; Phoenix PNX3-90 283 ft³–494 ft³; Phoenix PNX6-90 283 ft³–530 ft³; Phoenix PNX6-105 318 ft³–565 ft³; Phoenix PNX6-120 388 ft³–636 ft³; Phoenix PNX6-150 494 ft³–883 ft³; Phoenix PNX6-180 636 ft³–989 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 Phoenix need?
It depends on the size and your supply: Phoenix PNX3-45: 3~ 400 V: 6.5 A, 1~ 230 V: 19.6 A; Phoenix PNX3-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; Phoenix PNX3-75: 3~ 400 V: 10.8 A, 1~ 230 V: 32.6 A; Phoenix PNX3-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; Phoenix PNX6-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; Phoenix PNX6-105: 3~ 400 V: 15.2 A, 1~ 230 V: 45.7 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the SAWO Phoenix take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Phoenix PNX3-45 80–105 min; Phoenix PNX3-60 55–80 min; Phoenix PNX3-75 55–75 min; Phoenix PNX3-90 45–60 min; Phoenix PNX6-90 60–80 min; Phoenix PNX6-105 50–65 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the SAWO Phoenix take?
As stated by SAWO: Phoenix PNX3-45 187 lb; Phoenix PNX3-60 187 lb; Phoenix PNX3-75 187 lb; Phoenix PNX3-90 187 lb; Phoenix PNX6-90 287 lb; Phoenix PNX6-105 287 lb; Phoenix PNX6-120 287 lb; Phoenix PNX6-150 287 lb; Phoenix PNX6-180 287 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.