Water heaters make a distinct popping or cracking noise due to heavy mineral sediment and lime scale accumulation trapped at the bottom of the storage tank. Over time, calcium and hard water minerals settle out and form a thick layer over the burner or lower electric element. When the water heater fires up, water trapped underneath this sediment blanket boils rapidly, expanding into steam bubbles that force their way upward through the mineral crust, creating a loud popping sound. Verification: Flush your water heater tank thoroughly to clear out sediment buildup.
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