The most common place for a water heater to leak is at the top plumbing connections (the cold water inlet and hot water outlet nipples), the temperature and pressure (T&P) relief valve discharge pipe, or the bottom tank seams. Top fitting leaks are often caused by loose dielectric unions or pipe corrosion, while a leaking T&P valve typically indicates excessive water pressure or thermal expansion. A leak originating from the bottom tank wall or seams generally signifies catastrophic internal tank failure. Verification: Wipe fittings dry and inspect to locate the exact leak source.
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