To quiet a noisy hot water heater plagued by rumbling, popping, or banging noises, you must flush the tank to eliminate accumulated mineral sediment. Turn off the power or gas supply, attach a garden hose to the bottom drain valve, and direct it to a floor drain. Open the drain valve and the cold water inlet valve simultaneously to scour out loose calcium scale. If flushing does not stop the noise, commercial tank cleaner or professional descaling may be required. Verification: Refill the tank completely before restoring power and check for quiet operation.
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