Do you want to save water in the shower?
I know a few people have done this on their own by cobbling the parts together and self engineering. Now there is a ready made system to stop wasting the fresh water while waiting for hot water in th...
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I put a tee, then a valve in the hot water supply line under the bath sink. Then I ran a hose to the fresh water tank vent hose connecting with a Y. With this setup, I can save the water as well as supply heat, during freezing temperatures, to the fresh water tank and plumbing between the water heater and the bath. Yes, I have a simple heating "system" for the underbelly, but it is not very effective. Since my water heater is quite a distance from the bath it was worth doing.
