ernie1 wrote:
I've had a Truma od water heater in my 2018 rv for four years and have had zero problems with it and plenty of continuous very hot water. Certainly hot enough to be super uncomfortable and maybe cause an injury. Dunno about others but am I just lucky?
What weather conditions are you using it under?
If the average temp is in the 80's, your fresh water tank is likely feeding it water in the 80's, so it only needs to raise the temp by around 25 degrees to feel hot.
If you camp in cooler weather, the fresh water tank may be feeding it 40-60f temp water and it will have to raise the temp by 45-65 degrees to get the same temp.