Identifying that a hot water tank is failing involves watching for definitive signs of advanced aging and structural deterioration. Major warning signs include discolored rusty water from hot taps, persistent loud rumbling or booming noises from sediment boiling inside the tank, a noticeable reduction in hot water volume or recovery speed, foul sulfur (rotten egg) odors, and visible weeping leaks or rust streaks pooling around the tank base or top fittings. Verification: Check the serial number sticker to confirm the exact age of your water heater and inspect for leaks.
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