When a water heater sounds like it is popping popcorn, it is experiencing heavy mineral sediment scaling and hard water accumulation at the bottom of the storage tank. Over years of operation, calcium and lime scale settle out and form a thick layer over the burner or lower heating element. When the unit fires up, water trapped beneath this sediment blanket boils instantly into tiny steam bubbles that burst upward through the mineral crust, mimicking the exact sound of popping popcorn. Verification: Flush your water heater tank thoroughly to clear out the accumulated hard water scale and quiet the unit.
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