Same thing happened to me, when I had the coach winterized I think they got some anti-freeze in the water heater. With the by-pass in "non-bypass mode" I opened the water heater vent and drain and let it empty. Then connected the hose to the coach and ran it for about five minutes with water pouring out the water heater drain. After I was certain the water heater was anti-freeze free I went and ran ALL hot water faucets for 5-10 minutes each until they ran clear "no foam" I even did the outside shower. after that I did the cold but not as long. Then I filled the tank and I appear to foam free.
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2023 Thor (same on their quality) Tellaro 20L
200ah Relion - No generator
Iowa/Colorado/Florida
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