Recognizing that a water heater is failing involves monitoring critical operational and physical warning signs. Major indicators include water failing to reach normal hot temperatures, running out of hot water much faster than usual, loud rumbling or popping noises from boiling sediment, foul sulfur odors in the water, discolored rusty water from hot taps, visible rust streaks along the outer jacket, and external weeping leaks around tank seams or fittings. Verification: Inspect the exterior tank and test hot water output temperatures regularly.
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