Depends entirely on how the system was laid out I guess. If you're in a cold region, say Iceland, and water-cool your miners entirely by running the hot water against a thermoelectric system with the one side out in the snow, maybe 60%?

I wonder why you don't have a miner-hot-water heater? Use energy to mine and the waste heat to keep your tank warm.

I was trying to find article about some random guy who used mining rig to suprcharge his heat pump [0] but found commercial solutions [1]. Just search "miner heater" on google.

[0] https://medium.com/swlh/heating-my-home-with-crypto-mining-1...

[1] https://greenheat.systems/

I once joked here about crypto showers. Electric showers are ubiquitous where I live, it's just a dumb resistance heating up water. Could be replaced with a ton of processors mining cryptocurrency and heating up the water as a side effect.

Are you telling me this sort of thing already exists today?

There have been stories of people heating houses that way, actually.