Quote:
Originally Posted by Ryland
Heat pump water heaters have a hard time getting water heated those last few degrees, that is why they are limited to 130 degrees and sometimes use resistance elements to get that last little bit of heat in there so I would say to turn down the temp of the heat pump water heater and use it as the pre-heater, or just run the heat pump water heater off solar, it would be a larger investment but it would be cheaper then buying enough PV to run a resistive element.
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If I put the heat pump as the preheater and it's night and calm (no wind), won't the water in the second heater get cold, causing us to have to run the water until the hot flows through from the heat pump - about 50 gallons worth? Seems like that would take a long time. I guess I could insulate the heck out of the second heater to keep the heat in there.
The heat pump is 220V. To run it off solar PV I would need a lot of panels and a large inverter.