However, resistive heating is 3-4 times less efficient then ground/air source heating, so if your actual aim is to heat the house, you can do a lot better[1]. I

However, resistive heating is 3-4 times less efficient then ground/air source heating, so if your actual aim is to heat the house, you can do a lot better[1]. It's just better, if you're generating heat anyway, to also use the waste heat than to dump it outside. [1] YMMV in permafrost regions, and the hardware is too expensive for many people.