receptacle on the block , you will lose your ground. I think this is why my old one stopped working and I replaced it. When I saw how corroded it was, I knew that was why. I will clean it tomorrow, test it and give you a definite answer. If I am right you will have to get some sandpaper up there to clean it, or some metal polish cleaner with steel wool. You will sometimes know when it comes on because you will hear a hissing sound of water being heated..