I just watched and episode of ATOH and saw the intstalation of a recirculating pump to fix the problem of running the hot water on the second floor for a while waiting for the water to get hot, wasting water.
I have the opposite problem here in Phoenix. We have to run the cold water for a long time before we get cold to come out of the faucet. The pipes run thru the attic space which gets mega hot up there.
Is there a way to use a recirculating pump to solve this issue?