On May 23, 1:12*pm, wrote:

Harry You virtually never see 3 phase at a residence but we do see 400
amp single phase service on a big house.

LOL give harry a break. He sees the 3 phase service at
the nut house he's been committed to and thinks it's a house.....

It's not an electric resistance heater, it's a heat pump. A unit in
the size the OP is talking about runs on 240V 50 to 60A circuit.