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Water Source Heat Pump - preheater
I was wondering if there are any manufacturers out there who make a water source heat pump where you can pass potable water directly through the condenser for preheating . I have done my research, and I know that Water Furnace has a de-superheater and that there is a company called TurboTech that makes the 'Enviro-Pak', but these are all indirect (or secondary) exchangers. My goal would be to use the condenser to preheat my domestic hot water. I was thinking of using a Carrier 50RVR. Has anyone ever done this before? Is the water cooled condenser approved for potable water??