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Old 10-22-2021, 11:04 PM   #1
Treetopguy's Avatar
Join Date: Oct 2016
Posts: 59
Hot water loop on Allegro Red 38LL

my 2021 38LL fits my needs well, but there are a few places I go that I Boondock without any hookups. I found that the hot water to the kitchen and back bath take much too long to make the trip. This results in lost water to the drain.
I have since installed a hot water loop. Since the water is initially pumped from the tank to the very back of the coach in order to supply the on-demand water heater, the hot water then must travel back to the middle of the coach where it supplies a manifold. The hot water is then pumped all the way back to the back of the coach for the back bath! This ended up taking nearly 1-1/2 minutes to get warm water to the shower.
I found the hot water supply line going to the back bath located above the water tank.
I then researched and found an automatic valve that would close at 95 degrees F.
I spliced the hot water supply line and installed a tee. I then installed a manual isolation valve, then the automatic valve. I routed the line to feed back into the gravity flow line so that the water would return to the tank.
Now, when saving water is a concern, I open the valve and let the hot water line preheat until the automatic valve closes. It now takes only 25 seconds for the shower to get warm enough to use, and the kitchen sink takes 15 seconds.
The valve was a little expensive but worth it to me. It's made by Thermomegatech and is a HAT valve. I got the 1/2 inch valve that closes at 95 degrees F and opens at 85 degrees F.
I'll try to attach photos.
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allegro, hot water, water

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