Any progress on the heat pump idea? With the original configuration (water cooler), if you flowed a gallon plus per minute through the original (water cooler) chilling tank, I would bet money it wouldn't freeze solid before your hot water tank got satisfied. We don't know what you're trying to heat, but even with a swimming pool heat sink, and constant source water flow, plus cap tube metering, your water jacket would still lack enough cold to choke the source water flow. Prove me wrong.
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