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I would be remiss to not suggest using a solar hot water system to pre-heat your feed water to the existing hot water heater. Full Disclosure - I'm in that business, however, there is nothing quite as nice as taking a hot shower knowing that you did not burn any fuel to make the water hot!!
Agree on the recirc pumps as well - fresh water is one of our most precious commodities, running it down the drain while waiting for the hot water to show up is pure waste.
Happy to go into more details if anyone wants....
best
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