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: Why does a water heater start making funny bubbling sounds and crackling noises. Is it some kind of mineral buid-up? Do I need to replace? Can I flush and clean? : : : : : Why does a 10 year old HWH suddenly start discharging water from the relief valve after use. Even after replacing both upper and lower thermostats and the relief valve, it still does it. What could be the problem? Thanks, Mike: : Question : : What is the water pressure at the tank? : : The T&P would be set for 150 PSI. If the water pressure in the home is over 80 PSI a pressure reducer should be installed on the main water supply. $75.00 for a 1 model at a plumbing/hardware store. : : Terry: Thanks,Terry. Ill check it.