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Yeah, heating up with miners is not efficient at all.

I remember seeing this miner produced in Russia that also worked as a heater, haha. We need to figure out better ways.

Maybe in the future all appliances that need to produce heat of somesorts like: stove, washing machine, dishwasher, etc will have ram/chips that turn on to crunch some numbers whilst at the same time putting out the heat needed to run the appliances task. 2 for 1 i see here