Harvia
Harvia The Wall Combi sauna heater
Harvia makes the The Wall Combi in 3 sizes, from 4.5 to 9 kW, for saunas of 106 ft³ to 494 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
4.5–9 kW
Rooms
106 ft³–494 ft³
Stones
44 lb
Sizes
3
Which size fits your sauna?
Your room's effective volume
265 ft³
Best fit: SW70S
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 |
|---|---|---|---|---|---|
| The Wall Combi SW45SHSW450400SSteamer | 4.5 kW | 106 ft³–212 ft³ | 44 lb | 35–45 min | $0.91 |
| The Wall Combi SW70SHSW700400SSteamer | 7 kW | 212 ft³–318 ft³ | 44 lb | 20–25 min | $0.99 |
| The Wall Combi SW90SHSW900400SSteamer | 9 kW | 283 ft³–494 ft³ | 44 lb | 20–25 min | $1.29 |
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
| Model | Supply | Current | Fuse / breaker | Cable |
|---|---|---|---|---|
| The Wall Combi SW45S | 1~ 230 V | 19.6 A | – | – |
| 3~ 400 V | 6.5 A | – | – | |
| The Wall Combi SW70S | 3~ 400 V | 10.1 A(computed) | – | – |
| 1~ 230 V | 30.4 A(computed) | – | – | |
| The Wall Combi SW90S | 1~ 230 V | 39.1 A | – | – |
| 3~ 400 V | 13 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
- The Wall Combi SW45S€599 at esaunashop.com (2026-10-18)
- The Wall Combi SW70S€649 at esaunashop.com (2026-10-18)
- The Wall Combi SW90S€679 at esaunashop.com (2026-10-18)
Prices and availability come from the shop or maker and change; their page is what counts. Shop offers are added as retailers join.
Sources
- esaunashop.com/harvia-the-wall-combi-sw45s-4-5-kwdealer · read 2026-10-18
- esaunashop.com/harvia-the-wall-sw70s-7-0-kwdealer · read 2026-10-18
- esaunashop.com/harvia-the-wall-combi-sw90s-9-0-kwdealer · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the Harvia The Wall Combi heat?
Harvia rates the sizes for these rooms: The Wall Combi SW45S 106 ft³–212 ft³; The Wall Combi SW70S 212 ft³–318 ft³; The Wall Combi SW90S 283 ft³–494 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 Harvia The Wall Combi need?
It depends on the size and your supply: The Wall Combi SW45S: 1~ 230 V: 19.6 A, 3~ 400 V: 6.5 A; The Wall Combi SW70S: 3~ 400 V: 10.1 A, 1~ 230 V: 30.4 A; The Wall Combi SW90S: 1~ 230 V: 39.1 A, 3~ 400 V: 13 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the Harvia The Wall Combi take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: The Wall Combi SW45S 35–45 min; The Wall Combi SW70S 20–25 min; The Wall Combi SW90S 20–25 min to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the Harvia The Wall Combi take?
As stated by Harvia: The Wall Combi SW45S 44 lb; The Wall Combi SW70S 44 lb; The Wall Combi SW90S 44 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.