I had a plumber come today and install a pressure reduction vavle on our water supply. The water heater also had to be replaced. I won’t really know if this solves the problem yet. I would like to know more about the grounding situation. The dielectric valves were very corroded when he removed them to install the new heater. There is already a bridge, but is there another way to make sure it is grounded properly? So far A.O. Smith has honored their warranty so I have not had to pay for the water heater, but I have had to pay installation. I was told the one that was just installed is under warranty until 2011. Thanks.