My hot water heater has rusted out on the bottom I went to home depot and they told me that there is a new code law in the state of Maryland that all hot water heaters have to have an over flow tank added to their system so I am trying to find out if this is correct or not cause I have never heard of it and I had another company come out today and they never said anything about this overflow tank so are you able to tell me anything about this required law thanks carolyn