Problem solved!
Thanks Archer. We will check the things you suggested. We have only been Rving for 18 months. Full-timing is more fun than we imagined, but there is so much more we have to learn. Too bad these things don't come with a comprehensive set of instructions and schematics! We are wintering in south Florida so the hot water issue is not on the top of our priorty list. Thanks again, Harry and Sunny