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mmphoto412 t1_j6j9ye9 wrote

I’m not an HVAC expert, so maybe one can chime in, however that seems extremely inefficient. Also you can’t run any rust or declassification inhibitors through the heating system.

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kistner t1_j6jagc2 wrote

It probably isn't efficient or I would have seen it more than twice in 30 years. But it is simple, water heater, pump, thermostat.

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mmphoto412 t1_j6jas28 wrote

Based on some quick googling, it is a thing, however it seems to be only used in mild climates.

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