You should become seriously concerned about your water heater making noise when you hear loud rumbling, popping, banging, or screeching sounds echoing from inside the tank during heating cycles. While minor, faint clicking or hissing sounds are normal operating noises, loud popping and rumbling indicate heavy mineral sediment accumulation boiling at the bottom of the tank, which creates dangerous thermal stress, reduces heating efficiency, and drastically accelerates the risk of a premature tank rupture. Verification: Flush your water heater tank immediately to remove accumulated sediment scale.
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