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Should I install 120 volt or 240 volt heaters?

If you have pre-existing wiring, check the voltage of your electrical circuit and install a heater with the same voltage. Both 120 and 240 volt heaters operate with the same output and use the same amount of electricity for any amount of time. 240 volt heaters require double pole breakers, and 120 volt heaters require single pole breakers.

See chart below (per NEC code):

Volts AC

Size of Breaker
or Fuse

Wire Size

Maximum Watts
on Circuit

120

20 Amp Single Pole

12/2 with Ground

1920

240

20 Amp Double Pole

12/2 with Ground

3840

240

30 Amp Double Pole

10/2 with Ground

5760