For additional comments on this, see the following posts:
The first heater that mines bitcoin #95352 https://www.heatbit.com
Heat your home while mining BTC #87158
It may be possible to instead use a cheap ASIC rig, but use fans that can reduce fan speeds, and then customize the power outputs to make it silent (or nearly so).
It's just a concept but how can you not love it 🥰

Compare that to the $1,200 Heatbit monstrosity:
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