I was going to install a hot water circulator, but now I don't need to. I used the 1 1/2" pipe size with a 1" wall thickness and did all the hot water pipes in the basement. I had already wrapped the pipes with cheap stuff from a big box store but that didn't do much to increase the time the water stayed hot. I added this on top of what I had and now my domestic hot water stays very hot for at least two hours or more while it sits in the pipes.
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