Sauna Heater Sizing: kW Chart
The right heater size ensures fast heat-up and efficient operation.
The Basic Formula
1 kW per 50 cubic feet of sauna volume. For outdoor saunas, add 20-30% more capacity.
Quick Sizing Chart
- 4x4x7 ft (112 cu ft): 3-4 kW indoor, 4-5 kW outdoor
- 5x6x7 ft (210 cu ft): 4-5 kW indoor, 6 kW outdoor
- 6x8x7 ft (336 cu ft): 6-7 kW indoor, 8-9 kW outdoor
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