The 8-10kW isn’t a big deal anymore given the prevalence of electric vehicles and charging them at home. A decade ago very few homes have this kind of hookup. Now it’s reasonably common, and if not, electricians wouldn’t bat an eye on installing it.

In the winter in northern Europe or the colder parts of North America, as part of a radiator system? Kind of works!

Any other time and place? The power to run it, plus the power to cool it.

But the cost of running them is.