Glad to know I'm not the only one struggling with this problem. I think we've all gotten some good solid advice on how to use this heater. The key seems to be understanding that we should start with the temp knob in a low position and work up from there. During the walk thru we were told that it didn't seem to make much difference where you set the knob. Technically, that's true. You're going to get hot water regardless of where you set it. If the incoming water is cool set the temp low, if incoming is icy, set the temp higher. For those of us who frequent the western deserts, if that incoming water is already warm (and it can be very warm) set the temp at the lowest setting. We are about to embark on a five day trip and will see how this philosophy works. I have already tried it here at home and it seems to work well. Good luck to everyone who commented and offered advice and suggestions. Forums like this are really helpful.
2014 Greyhawk 31FS/2013 Chevy Captiva Sport