Regular old s19 converted to use an 8" AC infinity fan.

If you are replacing an electric space heater it is a watt for watt swap and you get 100% profit in a sense because you get the same heat per dollar from a miner as an electric space heater.

I have mini splits which use a variable amount of electric per BTU depending on outdoor temp and duty cycle needed to keep up. The colder and windier the more $/BTU they cost me. The miner creates a base heat that keeps my mini splits at a cheaper duty cycle. Not quite as straight forward but I still get more sats than just doing a DCA with the extra $ I spend on my electric bill.