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RegGuheert said:
So how much does it cost to run a natural gas water heater (50 gallons)? (FWIW, I just used the numbers from the sticker on the side of the water heaters for my calculations.)

Maybe this will help you:

https://www.energy.gov/eere/femp/energy-cost-calculator-electric-and-gas-water-heaters-0
 
Would there be any merit in using a heat-pump water heater, where the heat input side of the heat pump (its cooling coils) was thermally bonded to the back-side of a solar PV array? Chilling the PV ought to boost its efficiency plus dump gobs of heat into the pump...
 
Levenkay said:
Would there be any merit in using a heat-pump water heater, where the heat input side of the heat pump (its cooling coils) was thermally bonded to the back-side of a solar PV array? Chilling the PV ought to boost its efficiency plus dump gobs of heat into the pump...

A roof-mounted solar water heater seems like a simpler solution that also works better.
 
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