Howdy. So in reviewing the manual for the Atwood propane water heater model on our 2016 rig I founds out that it is an electric model as well but the electric switch on the DSI panel in the trailer ...
I just upgraded my old gas only water heater with a gas/electric atwood. the atwood connection box shown above has a 12 volt relay inside it to control the 120 heating
it has a double switch plate for wh control, one switch for gas and another for 120 v operation, all control wiring is 12 v