Identifying that a water heater is on the verge of a catastrophic burst requires watching for severe warning signs. Key indicators include loud rumbling, popping, or banging noises echoing from the tank due to boiling sediment, visible rusting and weeping corrosion along the outer metal jacket and bottom seams, discolored or rusty hot water, frequent T&P relief valve discharge, and small puddles pooling beneath the tank. Verification: Inspect aging water heaters older than 10 years regularly for rust streaks or bulging metal.
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