SAWO
SAWO Aries sauna heater
SAWO makes the Aries in 10 sizes, from 4.5 to 18 kW, for saunas of 106 ft³ to 918 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 ft³–918 ft³
Stones
143 lb–243 lb
Sizes
10
Which size fits your sauna?
Your room's effective volume
388 ft³
- ARI3-454.5 kW
- ARI3-606 kW
- AR13-757.5 kW
- ARI3-757.5 kW
- ARI3-909 kW
- ARI6-909 kW
- ARI6-10510.5 kW
- ARI6-12012 kW
- ARI6-15015 kW
- ARI6-18018 kW
Best fit: ARI3-90
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 |
|---|---|---|---|---|---|
| Aries ARI3-45ARI3-45NB-BL-P-C, ARI3-45NB-CNR-BL-P-C, ARI3-45NB-CNR-P-CRound · Wall · Corner | 4.5 kW | 106 ft³–212 ft³ | 143 lb | 65–90 min | $1.22 |
| Aries ARI3-60ARI3-60NB-BL-P-C, ARI3-60NB-CNR-BL-P-C, ARI3-60NB-CNR-P-CRound · Wall · Corner | 6 kW | 177 ft³–318 ft³ | 143 lb | 50–65 min | $1.26 |
| Aries AR13-75AR13-75NB-CNR-BL-P-CCorner | 7.5 kW | 247 ft³–459 ft³ | 143 lb | 45–60 min | $1.62 |
| Aries ARI3-75ARI3-75NB-BL-P-C, ARI3-75NB-CNR-P-C, ARI3-75NB-P-CRound · Wall · Corner | 7.5 kW | 247 ft³–459 ft³ | 143 lb | 45–60 min | $1.62 |
| Aries ARI3-90ARI3-90NB-BL-P-C, ARI3-90NB-CNR-BL-P-C, ARI3-90NB-CNR-P-CRound · Wall · Corner | 9 kW | 283 ft³–494 ft³ | 143 lb | 35–50 min | $1.68 |
| Aries ARI6-90ARI6-90NB-BL-P-C, ARI6-90NB-P-C, ARI6-90NS-BL-P-CRound | 9 kW | 283 ft³–494 ft³ | 243 lb | 50–70 min | $2.00 |
| Aries ARI6-105ARI6-105NS-BL-P, ARI6-105NS-PRound | 10.5 kW | 318 ft³–530 ft³ | 243 lb | 45–60 min | $1.99 |
| Aries ARI6-120ARI6-120NS-BL-P, ARI6-120NS-PRound | 12 kW | 353 ft³–636 ft³ | 243 lb | 40–55 min | $2.24 |
| Aries ARI6-150ARI6-150NS-BL-P, ARI6-150NS-PRound | 15 kW | 459 ft³–812 ft³ | 243 lb | 35–45 min | $2.62 |
| Aries ARI6-180ARI6-180NS-BL-P, ARI6-180NS-PRound | 18 kW | 530 ft³–918 ft³ | 243 lb | 30–35 min | $2.65 |
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/aries-corner-black-nb/maker · read 2026-10-18
- sawo.com/aries-corner-black-ni2/maker · read 2026-10-18
- sawo.com/aries-corner-black-ns/maker · read 2026-10-18
- sawo.com/aries-corner-nb/maker · read 2026-10-18
- sawo.com/aries-corner-ni2/maker · read 2026-10-18
- sawo.com/aries-corner-ns/maker · read 2026-10-18
- sawo.com/aries-round-black-nb/maker · read 2026-10-18
- sawo.com/aries-round-black-ni2/maker · read 2026-10-18
- sawo.com/aries-round-black-ns/maker · read 2026-10-18
- sawo.com/aries-round-nb/maker · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the SAWO Aries heat?
SAWO rates the sizes for these rooms: Aries ARI3-45 106 ft³–212 ft³; Aries ARI3-60 177 ft³–318 ft³; Aries AR13-75 247 ft³–459 ft³; Aries ARI3-75 247 ft³–459 ft³; Aries ARI3-90 283 ft³–494 ft³; Aries ARI6-90 283 ft³–494 ft³; Aries ARI6-105 318 ft³–530 ft³; Aries ARI6-120 353 ft³–636 ft³; Aries ARI6-150 459 ft³–812 ft³; Aries ARI6-180 530 ft³–918 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 Aries need?
It depends on the size and your supply: Aries ARI3-45: 3~ 400 V: 6.5 A, 1~ 230 V: 19.6 A; Aries ARI3-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; Aries AR13-75: 3~ 400 V: 10.8 A, 1~ 230 V: 32.6 A; Aries ARI3-75: 3~ 400 V: 10.8 A, 1~ 230 V: 32.6 A; Aries ARI3-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; Aries ARI6-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the SAWO Aries take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Aries ARI3-45 65–90 min; Aries ARI3-60 50–65 min; Aries AR13-75 45–60 min; Aries ARI3-75 45–60 min; Aries ARI3-90 35–50 min; Aries ARI6-90 50–70 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the SAWO Aries take?
As stated by SAWO: Aries ARI3-45 143 lb; Aries ARI3-60 143 lb; Aries AR13-75 143 lb; Aries ARI3-75 143 lb; Aries ARI3-90 143 lb; Aries ARI6-90 243 lb; Aries ARI6-105 243 lb; Aries ARI6-120 243 lb; Aries ARI6-150 243 lb; Aries ARI6-180 243 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.