Sauna Heater Electrical: Breaker, Wire & Cost by kW
The circuit each heater size needs, worked out to NEC: breaker rating, copper wire gauge, voltage drop by run length, and cost to run. Pick your heater power.
3 kW
20A · 14 AWG copper4.5 kW
25A · 12 AWG copper6 kW
35A · 10 AWG copper8 kW
45A · 8 AWG copper9 kW
50A · 8 AWG copper10.5 kW
60A · 6 AWG copper
20A · 14 AWG copper4.5 kW
25A · 12 AWG copper6 kW
35A · 10 AWG copper8 kW
45A · 8 AWG copper9 kW
50A · 8 AWG copper10.5 kW
60A · 6 AWG copper
Not sure of your kW yet? Start with the heater-size calculator, or open the full electrical calculator for any value.
Licensed electrician required. This is a reference estimate, not an electrical design. Circuit sizing, GFCI/GFPE requirements, and conductor selection must be verified and installed by a licensed electrician to your local code (NEC and any local amendments take precedence).