What causes our water heater to make loud rumbling noises?

The two most common causes for such noises are steam and sediment in the tank. You can often correct steam problems by merely lowering the thermostat setting. If you suspect a faulty thermostat, turn the setting all the way down: then if the heat source doesn't go off, replace the thermostat. To get rid of problem-causing sediment in your water heater, open the drain valve at the bottom of the tank and drain off a little water until it runs clear. Draining the sediment should eliminate noise problems and allow your heater to operate more efficiently.

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