One of the first crypto personalities in Norway did this back in 2011. Even had an article in the local paper. “Local man heats bathroom with his computer”. Basically he had water based heating in the floor on his bathroom and had hooked the water cooling on his computer to that. Even had a script that would “start doing heavy calculations” when the temperature sunk below a threshold.

Reference: https://www.cw.no/it-bransjen-komponenter/bruker-pc-en-til-a...