When a water heater sounds like it is popping corn, it is experiencing heavy mineral sediment scaling at the bottom of the tank. Hard water minerals precipitate out over time and form a thick layer over the heating elements or burner. When the unit heats up, water trapped beneath this sediment layer 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 to clear out the accumulated hard water scale and quiet the unit.
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