Mondex
Mondex Rakka sauna heater
Mondex makes the Rakka in 3 sizes, from 6.6 to 10.5 kW, for saunas of 247 ft³ to 883 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
6.6–10.5 kW
Rooms
247 ft³–883 ft³
Stones
265 lb–441 lb
Sizes
3
Which size fits your sauna?
Your room's effective volume
424 ft³
Best fit: 9 kW
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 |
|---|---|---|---|---|---|
| Rakka 6.6 kW | 6.6 kW | 247 ft³–353 ft³ | 265 lb | 70–95 min | $1.91 |
| Rakka 9 kW | 9 kW | 318 ft³–530 ft³ | 265 lb | 60–80 min | $2.28 |
| Rakka 10.5 kW | 10.5 kW | 424 ft³–883 ft³ | 441 lb | 1.5–2 h | $3.81 |
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 |
|---|---|---|
| 6.6 kW | 9.5 A | 28.7 A |
| 9 kW | 13 A | 39.1 A |
| 10.5 kW | 15.2 A | 45.7 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
- esaunashop.com/mondex-rakka-6-6-kwdealer · read 2026-10-18
- esaunashop.com/mondex-rakka-9-0-kwdealer · read 2026-10-18
- esaunashop.com/mondex-rakka-10-5-kwdealer · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the Mondex Rakka heat?
Mondex rates the sizes for these rooms: Rakka 6.6 kW 247 ft³–353 ft³; Rakka 9 kW 318 ft³–530 ft³; Rakka 10.5 kW 424 ft³–883 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 Mondex Rakka need?
It depends on the size and your supply: Rakka 6.6 kW: 3~ 400 V: 9.5 A, 1~ 230 V: 28.7 A; Rakka 9 kW: 3~ 400 V: 13 A, 1~ 230 V: 39.1 A; Rakka 10.5 kW: 3~ 400 V: 15.2 A, 1~ 230 V: 45.7 A. A licensed electrician sizes the circuit from the heater's manual and local rules.
How long does the Mondex Rakka take to heat up?
In a well-insulated indoor room at the middle of each size's range, our heat model gives: Rakka 6.6 kW 70–95 min; Rakka 9 kW 60–80 min; Rakka 10.5 kW 1.5–2 h to reach 176 °F. Outdoor saunas, glass and cold weather take longer.
How many stones does the Mondex Rakka take?
As stated by Mondex: Rakka 6.6 kW 265 lb; Rakka 9 kW 265 lb; Rakka 10.5 kW 441 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.