Recognizing a malfunctioning water heater involves monitoring distinct physical and operational symptoms. Key warning signs include water failing to reach normal hot temperatures, running out of hot water much faster than usual, strange rumbling, popping, or banging noises coming from the tank due to boiling sediment, foul sulfur (rotten egg) odors in the water, visible rust-colored water from hot taps, or external weeping leaks around tank seams. Verification: Inspect the water heater tank exterior and test hot water output temperatures at nearby fixtures.
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