Fordguy64
If you look at my thread "another heat-pump water heater" you can see how I had accomplished the hack. The cork-screw type copper tube heat exchanger is working well.
If you thinking a 1 ton (12000 BTU) build the energy that will be used maybe more than a resistance type water heater.
The BTU of the donor was 5000 and its drawing about 350 watts utilizing BBQ gas propane.
Tig. welding, Nice talent for hacking. I would humbly suggest a 5-7k btu donor for hacking and the speed for recovery is the nature of the beast. Maybe you would require a larger tank for a reserve.
Randen
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