Electric heat pump water heaters have a coefficient of power of over three, and easily retrofittable minisplit air conditioners/heaters are well above four.<p>I don’t understand why Europe hasn’t bought up the world’s manufacturing capacity of them for all of 2022.
Tankless (gas or electric) water heaters (on-demand) might be suitable for many situations. I think they're far more common in Europe.<p><a href="https://www.energy.gov/energysaver/tankless-or-demand-type-water-heaters" rel="nofollow">https://www.energy.gov/energysaver/tankless-or-demand-type-w...</a>