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SAWO

SAWO Tower sauna heater

SAWO makes the Tower 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

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

441 ft³

35 ft³ – 1,624 ft³

Best fit: TH6-105

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
Tower TH2-30TH2-30NB-CNR-P-C, TH2-30NB-P, TH2-30NS-WL-PRound · Wall · Corner3 kW71 ft³–141 ft³154 lb1.7–2.3 h$1.11
Tower TH3-35TH3-35NB-CNR-P-C, TH3-35NB-P-C, TH3-35NB-WL-P-CRound · Wall · Corner3.5 kW106 ft³–212 ft³154 lb1.7–2.3 h$1.41
Tower TH3-45TH3-45NB-CNR-P-C, TH3-45NB-P-C, TH3-45NB-WL-P-CRound · Wall · Corner4.5 kW106 ft³–212 ft³154 lb70–95 min$1.27
Tower TH3-60TH3-60NB-CNR-P-C, TH3-60NB-P-C, TH3-60NB-WL-P-CRound · Wall · Corner6 kW177 ft³–283 ft³154 lb50–65 min$1.24
Tower TH4-60TH4-60NB-CNR-P-C, TH4-60NB-P-C, TH4-60NB-WL-P-CRound · Wall · Corner6 kW177 ft³–318 ft³231 lb65–90 min$1.59
Tower TH5-80TH5-80NB-CNR-P-C, TH5-80NB-P-C, TH5-80NB-WL-P-CRound · Wall · Corner8 kW247 ft³–459 ft³231 lb55–75 min$1.94
Tower TH6-80TH6-80NB-CNR-P-C, TH6-80NB-P-C, TH6-80NB-WL-P-CRound · Wall · Corner8 kW247 ft³–494 ft³353 lb75–100 min$2.30
Tower TH5-90TH5-90NS-CNR-P-C, TH5-90NS-WL-P-C, TH5-90Ni2-CNR-P-CRound · Wall · Corner9 kW283 ft³–494 ft³231 lb50–65 min$1.95
Tower TH6-90TH6-90NB-CNR-P-C, TH6-90NB-P-C, TH6-90NB-WL-P-CRound · Wall · Corner9 kW283 ft³–530 ft³353 lb70–90 min$2.49
Tower TH6-105TH6-105NS-CNR-P, TH6-105NS-WL-P, TH6-105Ni-CNR-PRound · Wall · Corner10.5 kW318 ft³–565 ft³353 lb55–75 min$2.44
Tower TH9-105TH9-105NS-WL-P, TH9-105Ni-P, TH9-105Ni-WL-PRound · Wall10.5 kW353 ft³–565 ft³507 lb75–100 min$2.97
Tower TH6-120TH6-120NS-CNR-P, TH6-120NS-WL-P, TH6-120Ni-CNR-PRound · Wall · Corner12 kW388 ft³–636 ft³353 lb50–70 min$2.71
Tower TH9-120TH9-120NS-WL-P, TH9-120Ni-P, TH9-120Ni-WL-PRound · Wall12 kW388 ft³–706 ft³507 lb70–95 min$3.40
Tower TH9-150TH9-150NS-WL-P, TH9-150Ni-P, TH9-150Ni-WL-PRound · Wall15 kW494 ft³–883 ft³507 lb60–80 min$3.59
Tower TH12-150TH12-150NS-WL-P, TH12-150Ni-P, TH12-150Ni-WL-PRound · Wall15 kW530 ft³–918 ft³794 lb80–110 min$4.66
Tower TH12-180TH12-180NS-WL, TH12-180Ni-P, TH12-180Ni-WL-PRound · Wall18 kW636 ft³–1,059 ft³794 lb70–95 min$5.07
Tower TH9-180TH9-180NS-WL-PWall18 kW636 ft³–989 ft³507 lb50–65 min$3.95
Tower TH12-210TH12-210NS-WL-P, TH12-210Ni-P, TH12-210Ni-WL-PRound · Wall21 kW777 ft³–1,236 ft³794 lb60–85 min$5.32
Tower TH12-240TH12-240NS-WL-P, TH12-240Ni-P, TH12-240Ni-WL-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
3 kW4.3 A13 A
3.5 kW5.1 A15.2 A
4.5 kW6.5 A19.6 A
6 kW8.7 A26.1 A
8 kW11.5 A34.8 A
9 kW13 A39.1 A
10.5 kW15.2 A45.7 A
12 kW17.3 A52.2 A
15 kW21.7 A65.2 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 Tower heat?

SAWO rates the sizes for these rooms: Tower TH2-30 71 ft³–141 ft³; Tower TH3-35 106 ft³–212 ft³; Tower TH3-45 106 ft³–212 ft³; Tower TH3-60 177 ft³–283 ft³; Tower TH4-60 177 ft³–318 ft³; Tower TH5-80 247 ft³–459 ft³; Tower TH6-80 247 ft³–494 ft³; Tower TH5-90 283 ft³–494 ft³; Tower TH6-90 283 ft³–530 ft³; Tower TH6-105 318 ft³–565 ft³; Tower TH9-105 353 ft³–565 ft³; Tower TH6-120 388 ft³–636 ft³; Tower TH9-120 388 ft³–706 ft³; Tower TH9-150 494 ft³–883 ft³; Tower TH12-150 530 ft³–918 ft³; Tower TH12-180 636 ft³–1,059 ft³; Tower TH9-180 636 ft³–989 ft³; Tower TH12-210 777 ft³–1,236 ft³; Tower TH12-240 848 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 Tower need?

It depends on the size and your supply: Tower TH2-30: 3~ 400 V: 4.3 A, 1~ 230 V: 13 A; Tower TH3-35: 3~ 400 V: 5.1 A, 1~ 230 V: 15.2 A; Tower TH3-45: 3~ 400 V: 6.5 A, 1~ 230 V: 19.6 A; Tower TH3-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; Tower TH4-60: 3~ 400 V: 8.7 A, 1~ 230 V: 26.1 A; Tower TH5-80: 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 Tower take to heat up?

In a well-insulated indoor room at the middle of each size's range, our heat model gives: Tower TH2-30 1.7–2.3 h; Tower TH3-35 1.7–2.3 h; Tower TH3-45 70–95 min; Tower TH3-60 50–65 min; Tower TH4-60 65–90 min; Tower TH5-80 55–75 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.

How many stones does the SAWO Tower take?

As stated by SAWO: Tower TH2-30 154 lb; Tower TH3-35 154 lb; Tower TH3-45 154 lb; Tower TH3-60 154 lb; Tower TH4-60 231 lb; Tower TH5-80 231 lb; Tower TH6-80 353 lb; Tower TH5-90 231 lb; Tower TH6-90 353 lb; Tower TH6-105 353 lb; Tower TH9-105 507 lb; Tower TH6-120 353 lb; Tower TH9-120 507 lb; Tower TH9-150 507 lb; Tower TH12-150 794 lb; Tower TH12-180 794 lb; Tower TH9-180 507 lb; Tower TH12-210 794 lb; Tower TH12-240 794 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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