Sure it would work. Probably not worth the effort, but it would work, and
would even bring the water up to attic temperature before going into the gas
water heater.

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in series that wouldnt work although he could do it by adding some
valves.

although I would leave the tank full of non moving water for a extended
time.

the best thing he can do is monitor his electric bill if it spikes then
try something else