Using the heat from the coils is just how an air to water heat pump works. I have a commercial client that runs huge freezers (the size of a house), initially, all the waste heat was lost to the fresh air outside, until I persuaded him that an ashp to preheat his sterilizer water tank would save a large amount of money. We now have that powered with solar pv, and then an additional array of 600 evacuated tubes to get the sterilizer water tank to 95C. On a sunny day, he can run the plant for nothing!
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