The most common cause of a water heater leak is internal glass-lined steel tank corrosion and rust failure caused by aging and acidic water chemistry over time. Other very frequent causes include excessive thermal expansion and high water pressure that forces the temperature and pressure (T&P) relief valve to discharge water, loose plumbing connections at the hot outlet or cold inlet nipples, or a deteriorated gasket around the bottom heating element flange. Verification: Inspect fittings and tank base walls to pinpoint whether the leak is external or structural.
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