Originally Posted by Ian Walker
How to tell if Hot Water Tank is full? open any tap & if water comes out the tank is full.
This isn't necessarily true in all cases, and if the crossover valve is still in the winterization mode, you will get water from the hot tap, but it's not coming from the hot water tank.
I'd hate to lead a newbie down this road, without them fully understanding how the winterization crossover/bypass valves work first.
As from the previous link:
"Probably the easiest way to verify there is water actually in the water heater, is to briefly flip up the lever on the temperature/pressure relief valve at the top of the water heater (pic below). If water comes out here, then the heater should be full of water. Just turning on the hot water faucets inside the RV, cannot be a trusted way to verify. If you have your water heater bypass valves still in the winterization mode, then the cold water line is actually merged into the hot water line, and you will get water out of the hot water faucets.......but it's not coming from the water heater, which would be bypassed and dry inside....and since it's dry, you'll burn out your electric heating element if you turn the switch on."