When a water heater suffers from severe internal corrosion, the protective glass lining and sacrificial anode rod are completely gone, leaving the bare steel tank walls exposed to continuous electrochemical oxidation. This progressive corrosion creates pitting, weakens welded seams, and eventually eats all the way through the tank walls, resulting in unrepairable leaks, rusty discolored water, and a high risk of a sudden, catastrophic tank rupture. Verification: Inspect the tank exterior for rust streaks and check water clarity to evaluate corrosion levels.
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