On Sat, 29 Feb 2020 14:56:10 -0500 (EST), Justan Ohlphart
wrote:

I came across a system that recirculates hot water in your fresh
water plumbing. It helps to save water wasted when opening a
faucet and waiting for hot water. Easy installtion and priced
around $200. Lowes has it and Amzon has it a little
cheaper.

I also found a 12 v pump that can be substituted in for boats and RVs.

I put one in my house and it seems to work well. Next step is to
put one in my camper where conserving water is even more
importent.

That is a pretty old concept and in multi story houses it was as
simple as a hot water return line back to the bottom of the water
heater letting gravity be your pump. It lost favor during the Carter
administration when saving energy was more important than saving
water.