So the problem-

If i had 2x Bitmain S19 XP 141 TH to heat my house, but only want to mine on cheap electricity 10p/kWh for 6 hours at night. This gives me free heating minus hardware.

2mines x 6hrs x 3.01kW = 36kWh . With regular air cooling we’d all wake up in the middle of the night sweating!

Where to dump the heat to slowly disperse throughout the day or evening when we’re relaxing ?I can live with one mine or 18kWh of heat that would partially be absorbed into the fabric of the building. So where to dump the other 18kWh.?

The Bitmain water cooled mines are all 3 phase - not helpful. And specified water temp input temperature of 20 - 40c. Air cooled mines emit air at 40c air. Seems like 40c is the highest water temperature i can achieve without getting to complicated.

I’ll need a thermal mass large enough to store heat something like a tonne of water. Between 20c(68F) & 40c(104F) 1tonne of water will store 23.28kWh - in the house ( that’ll upset the Mrs😅) Fish tank ?

So, how to absorb & dissipate heat energy from an air cooled mine, into a tonne of water? Car radiators? Gravity fed up into the water storage? Huge fish tank(s) full of mineral oil & throw the miners in?