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Node?? Thanks for all who replied, HJ, Why would replacing the anode rod every 6 months or so resolve the thumping for a time? The rumbling and faucet problem do not occur at the same time.

I have a gas fired water heater (American flameguard) that is 4.5 years old and I also have a water softener. After the water was installed for six months, the unit began to rumble loudly when a lot of hot water is used for a shower. I am in the room directly above the water heater and you can...