Comment by ksherlock

7 days ago

It's not waste heat if you only run it in the winter.

Opt if you ignore that both gas furnaces and heat pumps are more efficient than resistive loads.

  • Heat pump sure, but how is gas furnace more efficient than resistive load inside the house? Do you mean more economical rather than more efficient (due to gas being much cheaper/unit of energy)?

    • Depends where your electricity comes from. If you're burning fossil fuels to make electricity, that's only about 40% efficient, so you need to burn 2.5x as much fuel to get the same amount of heat into the house.

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    • You accelerate the climate catastrophe so there's less need for heating in the long run.

  • I'm in the market for an oven right now and 230V/16A is the voltage/current the one I'll probably be getting operates under.

    At 90°C you can do sous vide, so basically use that waste heat entirely.

    For such temperatures you'd need a CO2 heat pump, which is still expensive. I don't know about gas, as I don't even have a line to my place.