I have a 2004 winnebago Journey 36G. I have replaced the check valve behind the water hearer a couple of time. Today while unwinterizing all was going well after flushing the water heater and lines....
Doug Sorry to not post the make and model of hot water heater but it has no mixing valve nor a second check valve--so I could see no need to pursue the water heater angle farther. Thanks for your help. Tom