I just started to have the same issue. As most of you know my unit was plugged into a campground receptacle that was wired wrong (220V) and of course my element was shot. Well the RV dealer changed it, now my hot water is maybe 75*, if we are lucky. I brought it back to the RV dealer they said it worked, the water temp was 118* and they could not hold their hand under the water. Well I picked it up today, got home set it up and only powered on the water heater, after 45 minutes of being on,water temp is the same as it was before I brought it in, maybe 75*. Called the RV dealer back they said I am more than welcome to bring it back and plug in and see it was working at their place. The RV dealer and myself are sure cornfused about this one
Any ideas to what I can check myself before I bring it back to the dealer?