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For heating a home efficiently, one approach is a rocket mass heater. It does require burning firewood, but if that's an acceptable/desirable quality, this technology seems far more efficient than standard fireplaces.

https://en.wikipedia.org/wiki/Rocket_mass_heater



I have thought about that but it’s a bit too much custom work to add into a passive house.

I might try one in a future garden shed/office.




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