[JRTJH]

Below are some photos to give you a "start on understanding your water heater"...

First is a drawing of 4 anode rods, All are "considered good except the last one". You can replace earlier, but ALWAYS replace when the anode is depleted. Most people choose to replace the anode somewhere between 25% and 75% depleted. I shoot for around 50% depleted and replace at that time.

Second is the electric heating element switch on the water heater front panel. NOTE that it is mounted in the heater "upside down" so up is off and down is on...

Next is the "2000-2015 water heater bypass system" prior to that, many trailers did not even have a bypass or it was a "3 valve system". In yours, you'll probably find a single valve on the bottom (cold water inlet) and a "one way valve" on the top (hot water outlet). One of the photos shows the hot water outlet (disconnected connection) with the one way brass vavle still in the water heater outlet. That valve does cause some problems when it calcifies and starts sticking.

DO NOT TURN ON THE WATER HEATER UNTIL YOU HAVE VERIFIED THAT IT IS FULL OF WATER.