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I doubt it saves anyone any money. The units themselves are about $125 each, then the cost of the tech to install them, then ongoing maintenance and administrative costs...
My hot water heater is tiny at the apt. It gives maybe 10min of hot water at the 2.5 gal showerhead flow-rate. I've since installed a 2 gal flow head because the 2.5 had a garbage pattern and didn't have a wand. Hot water lasts a bit longer now. Perhaps it's a 10 gallon tank?
There is a certain percentage of the utility bill that goes towards efficiency programs, and my guess is the utility has to use it or lose it. This is probably just a program designed to consume funds they have already received. If they were really interested in lowering consumer bills, they would just charge me less in the first place.
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