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Checkvalve
For what it is worth, Winnebago puts a check valve at the output of the water heater to prevent the antifreeze to go back into the WH. It may leak a little. I’ve had the opposite problem twice, e.g. the CV has plugged in the normal flow direction. The CV has been of the plastic interior kind, and it appears to deteriorate in the hot environment. First time, I told the service manager that I didn’t know whether the CV was integral to the WH or not, and to remove it entirely if it weren’t, replacing it with a hose dangling free for me to deal with. I specifically told him I wanted no part of a CV in the system. If it was integral, well then I would obviously have to replace the WH. They did the latter, even if Atwood, as I learned 5 to 6 years later, had no such integral part. That’s how you make money… The second time I had time to research and found the “secret.” Since the Adventurer uses the truck radiator fluid heating option, it can be a messy removal, but I circumvented it by removing the plywood wall where the pump and bypass valve are mounted, giving me access to the back, albeit tight. This is how I discovered the deterioration inside the CV. I replaced it with another manual shutoff, mounted to the aforementioned plywood. Currently, I don’t use the bypass option anyway, since blowing out the lines is so much easier.
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Linear Mode
