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Just looked up my model online and found that it has heat traps (aka check valve!) installed on the input and output. I am going to call Direct Energy again and let them have it for transfering me from the HWT rental department (where by the way I was told that it is not possible for a HWT to...

Thanks to you and everyone for the replys. I was thinking the same thing, but I went online to a "how it works" website to see what the inside of a HWT looks like, but it did not show a check valve. I would think that if there was not one, hot water could be pulled out through the "cold in" when...

Guys, I have the strangest problem. First off, I am very technically inclined, and plumbing is not new to me at all. Here's my strange problem. I open the hot water tap anywhere in the house and no water comes out, not cold water, no water at all. Then suddenly, I will hear a loud bang from...