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I've been thinking about HPWH for years, Heat Tap I think was an early add on style. Problem is, during heating season, it takes the heat out of the air in the room to put it into the water. So my furnace has to make up the difference so I'm really still heating water with propane (some heat does come from basement walls/floor).
My water heater also does double duty heating some floor slab mostly at night so I'd just be moving heat, cooling the basement while heating a floor.
During summer it would work great cools and dehumidifies the basement while heating water, way better than running a dehumidifier, just too expensive for seasonal use.
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