Quote:
Originally Posted by Servicetech
The problem with heat pump water heaters is they work harder as the incoming water tempatures drop. In summer when a heat pump water heater would be most effective incoming water tempatures are in the 70's. Payback time for heat pump water heater is simply too long. If you have natural gas, forget it. No way a heat pump water heater will ever pay for itself when compared to gas.
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It is very interesting what you have said.
It looks like you have a solid understanding of payback time, which some other people understand as break-even.
Could you please show us your calculations (graphical would be even better) so that we can understand your point?
Sincerely,
-AC