I purchased an older travel trailer last year but I have not used it yet. I am cleaning it and currently have it set up in my yard. We felt that it would be better this way to test all of the "stuff". Everything is working fine with the exception of the water heater. When we turn the water heater on we can feel the unit getting warm and water in the hose next to the unit is warm/hot but we cannot get hot water from the taps. We have checked all of the valves and they are working properly. We have plenty of water pressure for both cold and what should be hot water but it is not. Does anyone have any suggestions? The paperwork that came with the unit is more about installation than usage. Any help would be greatly appreciated. I want to use my RV.