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A 10' x 10' = 100 sq feet, sauna is a very large sauna. A large 8000 watt (8 kW) sauna heater will only heat a maximum of 67 sq. feet. This size sauna will be getting into the commercial size heating units.

Your sauna will have a volume of 800 cubic feet. It will need a 14.4 kW heater which will do a volume from 630 to 950 sq. feet. This size sauna unit will draw A = W/E = 14000/240 = 60 amps. The feeder conductors can only be loaded to 80% capacity and de-rated because of temperatures over 35 degrees C, so they will need to be a #4 which will give a capacity of 76 amps.

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10y ago

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