Mikepier wrote:

Usually it is a required code for a furnace or boiler to be on their
own circuit with some kind of emergency shut off switch closeby like at
the top of basement stairs.
But for the record, a gas furnace with the blower motor usually does
not pull more than 3-4 amps, depending on the size of the unit.

I don't think mine is unusual, and it takes about 5 1/4 amps.

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