You're not likely to get 300% efficiency when it really matters, in colder climates. The temperature outside my house is around -10C now, and closer to -20C at

You're not likely to get 300% efficiency when it really matters, in colder climates. The temperature outside my house is around -10C now, and closer to -20C at night this week. Keeping my house warm requires around 6-10KW constantly atm, which I could perhaps reduce to 5-8KW with a heat pump (some heating will come from other appliances, like computers, fridges, etc). Or I have used the oil boiler in the basement, if Norway didn't ban that in 2020. That would have freed up enough electricity for several homes in the UK or Germany. Electrical heating is fine if all electricity produced is from hydro, nuclear or wind/solar, but it makes less sense if the grid relies too much on fossil fuels.