Originally Posted by ScottChristina02
Thought the same thing as well. So I did what you said and it is still doing it when I turn the water heater switch on.
Close your city water off, then turn your water heater on, does it drain the H/W tank? I just do not see how it can drain the tank, it is not pressurized. If it is still doing it open your fresh water fill, in case there is a vacuum. I have never ever heard of this kinda of problem, and your water pump is off correct?