A heavy rumbling sound coming from your water heater is almost always caused by thick 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, creating expanding steam pockets and deep rumbling vibrations that strain the steel tank walls. Verification: Flush your water heater tank immediately to clear out the accumulated sediment and eliminate the rumbling noise.
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