how cold do you want it to be? how much water do you need to chill, and how much do you want to spend running it? is this just for drinking water, or are you going to chill water so you can pay to heat it in the water heater later?
also no reason you can't use a thermal storage tank in reverse. run the city water through the HX, chill the mass storage - just make sure the HX is double wall/rated for potable use.
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