I am a plumber gas water heater is cheaper not sure about a propane fridge. As for the chiller idea and efficiency I think this is the last of our worries there are so many businesses-grow ops that use the same idea on a way larger scale. Flower store needs a cool room lots of liqueur stores use them most grow ops use them legal or not I hook them up often 3/4 line straight in the unit basically a radiator with fans as water in unit heats up it dumps it right down the drain and fills back up some of these units are 6-8 feet long. Also this is part of the reason city is surrey moved to water meters 5 years ago. Not so cost efficient any more with the big units.
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