What if you just plumbed in a section of copper pipe right at the compressor discharge, like the airtap A7? Fed to a 5 or 10 gallon insulated tank, then on to the condenser already in the fridge. The tank would initially raise the performance of the fridge due to added heat transfer, then store heat for on-demand hot water. Every time water was drawn from the unit, there would be a boost in cooling performance.
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