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SAWO

SAWO SAWO30 sauna heater

SAWO makes the SAWO30 in 7 sizes, from 4.5 to 24 kW, for saunas of 106 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

4.5–24 kW

Rooms

106 ft³–1,413 ft³

Stones

154 lb–794 lb

Sizes

7

See it in the 3D studioBuilt-in controls · Separate control unitNot sold in Europe & international in this version

Which size fits your sauna?

Your room's effective volume

512 ft³

71 ft³ – 1,624 ft³

Best fit: SW6-120

Work out your effective volume

Effective 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

ModelOutputRoom rangeStonesHeat-upPer session
SAWO30 SW3-45SW3-45NB-BL-P-C, SW3-45NB-CNR-BL-P-C, SW3-45NB-CNR-P-CRound · Wall · Corner4.5 kW106 ft³–212 ft³154 lb70–95 min$1.27
SAWO30 SW3-60SW3-60NB-BL-P-C, SW3-60NB-CNR-BL-P-C, SW3-60NB-CNR-P-CRound · Wall · Corner6 kW177 ft³–283 ft³154 lb50–65 min$1.24
SAWO30 SW6-90SW6-90NB-BL-P-C, SW6-90NB-CNR-BL-P-C, SW6-90NB-CNR-P-CRound · Wall · Corner9 kW283 ft³–530 ft³353 lb70–90 min$2.49
SAWO30 SW6-120SW6-120NS-BL-P, SW6-120NS-CNR-BL-P, SW6-120NS-CNR-PRound · Wall · Corner12 kW388 ft³–636 ft³353 lb50–70 min$2.71
SAWO30 SW12-180SW12-180NS-BL-P, SW12-180NS-P, SW12-180NS-WL-BL-PRound · Wall18 kW636 ft³–1,059 ft³794 lb70–95 min$5.07
SAWO30 SW12-210SW12-210NS-BL-P, SW12-210NS-P, SW12-210NS-WL-BL-PRound · Wall21 kW777 ft³–1,236 ft³794 lb60–85 min$5.32
SAWO30 SW12-240SW12-240NS-BL-P, SW12-240NS-P, SW12-240NS-WL-BL-PRound · Wall24 kW848 ft³–1,413 ft³794 lb55–75 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

Outputthree-phase 400 V (per phase)single-phase 230 V
4.5 kW6.5 A19.6 A
6 kW8.7 A26.1 A
9 kW13 A39.1 A
12 kW17.3 A52.2 A
18 kW26 A78.3 A
21 kW30.3 A91.3 A
24 kW34.6 A104.3 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

Other heaters for the same rooms

Questions and answers

What size sauna does the SAWO SAWO30 heat?

SAWO rates the sizes for these rooms: SAWO30 SW3-45 106 ft³–212 ft³; SAWO30 SW3-60 177 ft³–283 ft³; SAWO30 SW6-90 283 ft³–530 ft³; SAWO30 SW6-120 388 ft³–636 ft³; SAWO30 SW12-180 636 ft³–1,059 ft³; SAWO30 SW12-210 777 ft³–1,236 ft³; SAWO30 SW12-240 848 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 SAWO30 need?

It depends on the size and your supply: SAWO30 SW3-45: 3~ 400 V: 6.5 A, 1~ 230 V: 19.6 A; SAWO30 SW3-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; SAWO30 SW6-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; SAWO30 SW6-120: 3~ 400 V: 17.3 A, 1~ 230 V: 52.2 A; SAWO30 SW12-180: 3~ 400 V: 26 A, 1~ 230 V: 78.3 A; SAWO30 SW12-210: 3~ 400 V: 30.3 A, 1~ 230 V: 91.3 A. A licensed electrician sizes the circuit from the heater's manual and local rules.

How long does the SAWO SAWO30 take to heat up?

In a well-insulated indoor room at the middle of each size's range, our heat model gives: SAWO30 SW3-45 70–95 min; SAWO30 SW3-60 50–65 min; SAWO30 SW6-90 70–90 min; SAWO30 SW6-120 50–70 min; SAWO30 SW12-180 70–95 min; SAWO30 SW12-210 60–85 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.

How many stones does the SAWO SAWO30 take?

As stated by SAWO: SAWO30 SW3-45 154 lb; SAWO30 SW3-60 154 lb; SAWO30 SW6-90 353 lb; SAWO30 SW6-120 353 lb; SAWO30 SW12-180 794 lb; SAWO30 SW12-210 794 lb; SAWO30 SW12-240 794 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.

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