misterroy wrote:
I visited a friend last night. He has a 9kw micro hydro scheme, and below his house he has a basement kind of flat. In the flat there is an electric heater set to 16 degrees, no-one is in the flat just now.
The heat could be supplied by the graphics cards, the electricity is being burned in a dumb heater to keep the place dry already. To him the cost would be the mining rig.
Any pitfalls I am not seeing.
The scheme yields pretty close to 9kw continuously.

That heater isn't on 24/7. It heats it up to 16 degrees then turns itself
off. When the temperature drops lower, it clicks back on again.

If you dump a constant 9kW into an enclosed space it'll get warm rather
rapidly. This is why server rooms are air conditioned.

If he can heat exchange into the river, then he might be onto something.
Though the fish probably won't like him for that.

Theo