SAWO
SAWO Heaterking sauna heater
SAWO makes the Heaterking in 19 sizes, from 3 to 24 kW, for saunas of 71 ft³ to 1,413 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
3–24 kW
Rooms
71 ft³–1,413 ft³
Stones
154 lb–794 lb
Sizes
19
Which size fits your sauna?
Your room's effective volume
441 ft³
- DRFT2-303 kW
- DRFT3-353.5 kW
- DRFT3-454.5 kW
- DRFT3-606 kW
- DRFT4-606 kW
- DRFT5-808 kW
- DRFT6-808 kW
- DRFT5-909 kW
- DRFT6-909 kW
- DRFT6-10510.5 kW
- DRFT9-10510.5 kW
- DRFT6-12012 kW
- DRFT9-12012 kW
- DRFT9-15015 kW
- DRFT12-15015 kW
- DRFT12-18018 kW
- DRFT9-18018 kW
- DRFT12-21021 kW
- DRFT12-24024 kW
Best fit: DRFT6-105
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 |
|---|---|---|---|---|---|
| Heaterking DRFT2-30DRFT2-30NS-PRound | 3 kW | 71 ft³–141 ft³ | 154 lb | 1.7–2.3 h | $1.11 |
| Heaterking DRFT3-35DRFT3-35NS-CNR-P-C, DRFT3-35NS-P-C, DRFT3-35NS-WL-P-CRound · Wall · Corner | 3.5 kW | 106 ft³–212 ft³ | 176 lb | 1.8–2.4 h | $1.43 |
| Heaterking DRFT3-45DRFT3-45NS-CNR-P-C, DRFT3-45NS-P-C, DRFT3-45NS-WL-P-CRound · Wall · Corner | 4.5 kW | 106 ft³–212 ft³ | 176 lb | 75–105 min | $1.38 |
| Heaterking DRFT3-60DRFT3-60NS-CNR-P-C, DRFT3-60NS-P-C, DRFT3-60NS-WL-P-CRound · Wall · Corner | 6 kW | 177 ft³–283 ft³ | 176 lb | 50–70 min | $1.32 |
| Heaterking DRFT4-60DRFT4-60NS-P-CRound | 6 kW | 177 ft³–318 ft³ | 231 lb | 65–90 min | $1.59 |
| Heaterking DRFT5-80DRFT5-80NS-P-CRound | 8 kW | 247 ft³–459 ft³ | 231 lb | 55–75 min | $1.94 |
| Heaterking DRFT6-80DRFT6-80NS-CNR-P-C, DRFT6-80NS-P-C, DRFT6-80NS-WL-P-CRound · Wall · Corner | 8 kW | 247 ft³–494 ft³ | 353 lb | 75–100 min | $2.30 |
| Heaterking DRFT5-90DRFT5-90NS-P-CRound | 9 kW | 283 ft³–494 ft³ | 231 lb | 50–65 min | $1.95 |
| Heaterking DRFT6-90DRFT6-90NS-CNR-P-C, DRFT6-90NS-P-C, DRFT6-90NS-WL-P-CRound · Wall · Corner | 9 kW | 283 ft³–530 ft³ | 353 lb | 70–90 min | $2.49 |
| Heaterking DRFT6-105DRFT6-105NS-CNR-P, DRFT6-105NS-P, DRFT6-105NS-WL-PRound · Wall · Corner | 10.5 kW | 318 ft³–565 ft³ | 353 lb | 55–75 min | $2.44 |
| Heaterking DRFT9-105DRFT9-105NS-P, DRFT9-105NS-WL-PRound · Wall | 10.5 kW | 353 ft³–565 ft³ | 507 lb | 75–100 min | $2.97 |
| Heaterking DRFT6-120DRFT6-120NS-CNR-P, DRFT6-120NS-P, DRFT6-120NS-WL-PRound · Wall · Corner | 12 kW | 388 ft³–636 ft³ | 353 lb | 50–70 min | $2.71 |
| Heaterking DRFT9-120DRFT9-120NS-P, DRFT9-120NS-WL-PRound · Wall | 12 kW | 388 ft³–706 ft³ | 507 lb | 70–95 min | $3.40 |
| Heaterking DRFT9-150DRFT9-150NS-P, DRFT9-150NS-WL-PRound · Wall | 15 kW | 494 ft³–883 ft³ | 507 lb | 60–80 min | $3.59 |
| Heaterking DRFT12-150DRFT12-150NS-P, DRFT12-150NS-WL-PRound · Wall | 15 kW | 530 ft³–918 ft³ | 794 lb | 80–110 min | $4.66 |
| Heaterking DRFT12-180DRFT12-180NS-P, DRFT12-180NS-WL-PRound · Wall | 18 kW | 636 ft³–1,059 ft³ | 794 lb | 70–95 min | $5.07 |
| Heaterking DRFT9-180DRFT9-180NS-P, DRFT9-180NS-WL-PRound · Wall | 18 kW | 636 ft³–989 ft³ | 507 lb | 50–65 min | $3.95 |
| Heaterking DRFT12-210DRFT12-210NS-P, DRFT12-210NS-WL-PRound · Wall | 21 kW | 777 ft³–1,236 ft³ | 794 lb | 60–85 min | $5.32 |
| Heaterking DRFT12-240DRFT12-240NS-P, DRFT12-240NS-WL-PRound · Wall | 24 kW | 848 ft³–1,413 ft³ | 794 lb | 55–75 min | $5.40 |
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 |
|---|---|---|
| 3 kW | 4.3 A | 13 A |
| 3.5 kW | 5.1 A | 15.2 A |
| 4.5 kW | 6.5 A | 19.6 A |
| 6 kW | 8.7 A | 26.1 A |
| 8 kW | 11.5 A | 34.8 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 |
| 21 kW | 30.3 A | 91.3 A |
| 24 kW | 34.6 A | 104.3 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/heaterking-round-ns/maker · read 2026-10-18
- sawo.com/heaterking-corner-ns/maker · read 2026-10-18
- sawo.com/heaterking-wall-ns/maker · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the SAWO Heaterking heat?
SAWO rates the sizes for these rooms: Heaterking DRFT2-30 71 ft³–141 ft³; Heaterking DRFT3-35 106 ft³–212 ft³; Heaterking DRFT3-45 106 ft³–212 ft³; Heaterking DRFT3-60 177 ft³–283 ft³; Heaterking DRFT4-60 177 ft³–318 ft³; Heaterking DRFT5-80 247 ft³–459 ft³; Heaterking DRFT6-80 247 ft³–494 ft³; Heaterking DRFT5-90 283 ft³–494 ft³; Heaterking DRFT6-90 283 ft³–530 ft³; Heaterking DRFT6-105 318 ft³–565 ft³; Heaterking DRFT9-105 353 ft³–565 ft³; Heaterking DRFT6-120 388 ft³–636 ft³; Heaterking DRFT9-120 388 ft³–706 ft³; Heaterking DRFT9-150 494 ft³–883 ft³; Heaterking DRFT12-150 530 ft³–918 ft³; Heaterking DRFT12-180 636 ft³–1,059 ft³; Heaterking DRFT9-180 636 ft³–989 ft³; Heaterking DRFT12-210 777 ft³–1,236 ft³; Heaterking DRFT12-240 848 ft³–1,413 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 Heaterking need?
It depends on the size and your supply: Heaterking DRFT2-30: 3~ 400 V: 4.3 A, 1~ 230 V: 13 A; Heaterking DRFT3-35: 3~ 400 V: 5.1 A, 1~ 230 V: 15.2 A; Heaterking DRFT3-45: 3~ 400 V: 6.5 A, 1~ 230 V: 19.6 A; Heaterking DRFT3-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; Heaterking DRFT4-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; Heaterking DRFT5-80: 3~ 400 V: 11.5 A, 1~ 230 V: 34.8 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the SAWO Heaterking take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Heaterking DRFT2-30 1.7–2.3 h; Heaterking DRFT3-35 1.8–2.4 h; Heaterking DRFT3-45 75–105 min; Heaterking DRFT3-60 50–70 min; Heaterking DRFT4-60 65–90 min; Heaterking DRFT5-80 55–75 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the SAWO Heaterking take?
As stated by SAWO: Heaterking DRFT2-30 154 lb; Heaterking DRFT3-35 176 lb; Heaterking DRFT3-45 176 lb; Heaterking DRFT3-60 176 lb; Heaterking DRFT4-60 231 lb; Heaterking DRFT5-80 231 lb; Heaterking DRFT6-80 353 lb; Heaterking DRFT5-90 231 lb; Heaterking DRFT6-90 353 lb; Heaterking DRFT6-105 353 lb; Heaterking DRFT9-105 507 lb; Heaterking DRFT6-120 353 lb; Heaterking DRFT9-120 507 lb; Heaterking DRFT9-150 507 lb; Heaterking DRFT12-150 794 lb; Heaterking DRFT12-180 794 lb; Heaterking DRFT9-180 507 lb; Heaterking DRFT12-210 794 lb; Heaterking DRFT12-240 794 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.