Rheem 50 gallon model 82V52D, starts out hot then goes luke warm after one shower. I turned the top thermostat down until the bottom came on last night and it is still on and I hear it cooking all the time. The top thermostat never shut down in over 24 hrs when I first installed it until I turned it way down, it then clicked, turned off, and the bottom had 240v. Now that one has been on since last night and never shuts off.