Those heat strips in heat pumps and even the old school electric heating units pull a bunch of current. And our overlords tell us they're better. My 105,000 BTU gas furnace was ran at night (ETA: during the polar freeze 2-3 years ago) with my Honda EU1000i generator that holds a whopping 1 gallon of fuel and it would run all night on that. I call bull****.I have a 22KW Generac and discovered it wasn’t enough when we lost power in 2021. I have a heat exchanger along with electric resistive “emergency” heat strips (which I’d never had before). Was sitting there all fat, dumb and happy when all of a sudden the generator tripped on overload. When utility power came back on I had the Mrs switch those heat strips on while I had a Fluke clamp-meter on the line side of my ATS. Just one heating unit pulled over 80 amperes and I have three. Had to completely rethink my strategy and thankfully I have a very workable solution. There are two gas/propane fireplaces in the house and believe it or not those darn things keep the whole house toasty and then some. We used that to heat the house this past winter and only went through 100 gallons of propane for the entire season. I know that with all the other loads we’d be running between 1/4-1/2 load so I’m back in business.
They have a whole lot of work to do before they convince me that electric heat is better than gas or propane.