A loud booming or cracking sound coming from your water heater is almost always caused by severe mineral sediment and lime scale accumulation at the bottom of the tank. As hard water minerals settle out over time, they form an insulating blanket over the burner or lower heating element. When the unit heats water, moisture trapped beneath this heavy sediment layer boils furiously into high-pressure steam bubbles that force their way upward through the mineral crust, producing a booming sound. Verification: Flush your water heater tank immediately to clear out accumulated sediment scale.
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