I wanted to follow up a little on the problem we had with our new Atwood On-demand (OD-5001). Long story short after three months of messing with it two certified Atwood repair centers told me to send it back and get a new one. We did that and received an exact replacement. Exactly the same symptoms. We exchanged it for an old fashioned tank type water heater. The Atwood OD-50 might be a great heater for some people but it simply didn't work for us. I don't know if it is where we live, 5000+ feet above sea level or not but we could never get hot water out of it. I think they still have bugs to work out. It is a new model and I simply didn't want to spend any more time being Atwood's Beta tester.