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SAWO

SAWO Savonia sauna heater

SAWO makes the Savonia in 7 sizes, from 9 to 24 kW, for saunas of 283 ft³ to 1,483 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

9–24 kW

Rooms

283 ft³–1,483 ft³

Stones

132 lb–220 lb

Sizes

7

See it in the 3D studioSeparate control unitNot sold in Europe & international in this version

Which size fits your sauna?

Your room's effective volume

636 ft³

177 ft³ – 1,730 ft³

Best fit: SAV-150

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
Savonia SAV-90SAV-90NS-Z, SAV-90NS-Z-F9 kW283 ft³–494 ft³132 lb35–45 min$1.61
Savonia SAV-105SAV-105NS-Z, SAV-105NS-Z-F10.5 kW318 ft³–530 ft³132 lb30–40 min$1.72
Savonia SAV-120SAV-120NS-Z, SAV-120NS-Z-F12 kW353 ft³–636 ft³132 lb25–35 min$1.84
Savonia SAV-150SAV-150NS-Z, SAV-150NS-Z-F15 kW459 ft³–812 ft³165 lb25–35 min$2.30
Savonia SAV-180SAV-180NS-V12-Z, SAV-180NS-V12-Z-F, SAV-180NS-Z18 kW600 ft³–1,024 ft³165 lb25–35 min$2.71
Savonia SAV-210SAV-210NS-V12-Z, SAV-210NS-V12-Z-F21 kW777 ft³–1,236 ft³220 lb25–35 min$3.34
Savonia SAV-240SAV-240NS-V12-Z, SAV-240NS-V12-Z-F24 kW918 ft³–1,483 ft³220 lb25–35 min$3.67

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
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 Savonia heat?

SAWO rates the sizes for these rooms: Savonia SAV-90 283 ft³–494 ft³; Savonia SAV-105 318 ft³–530 ft³; Savonia SAV-120 353 ft³–636 ft³; Savonia SAV-150 459 ft³–812 ft³; Savonia SAV-180 600 ft³–1,024 ft³; Savonia SAV-210 777 ft³–1,236 ft³; Savonia SAV-240 918 ft³–1,483 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 Savonia need?

It depends on the size and your supply: Savonia SAV-90: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; Savonia SAV-105: 3~ 400 V: 15.2 A, 1~ 230 V: 45.7 A; Savonia SAV-120: 3~ 400 V: 17.3 A, 1~ 230 V: 52.2 A; Savonia SAV-150: 3~ 400 V: 21.7 A, 1~ 230 V: 65.2 A; Savonia SAV-180: 3~ 400 V: 26 A, 1~ 230 V: 78.3 A; Savonia SAV-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 Savonia take to heat up?

In a well-insulated indoor room at the middle of each size's range, our heat model gives: Savonia SAV-90 35–45 min; Savonia SAV-105 30–40 min; Savonia SAV-120 25–35 min; Savonia SAV-150 25–35 min; Savonia SAV-180 25–35 min; Savonia SAV-210 25–35 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.

How many stones does the SAWO Savonia take?

As stated by SAWO: Savonia SAV-90 132 lb; Savonia SAV-105 132 lb; Savonia SAV-120 132 lb; Savonia SAV-150 165 lb; Savonia SAV-180 165 lb; Savonia SAV-210 220 lb; Savonia SAV-240 220 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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