The timeframe for a traditional storage tank water heater to rust out completely typically aligns with its average lifespan of 8 to 12 years, though aggressive water chemistry, high mineral content, and neglected maintenance can accelerate corrosion. Once the sacrificial anode rod—which is specifically designed to corrode preferentially and protect the steel walls—is completely depleted, the bare steel tank begins rusting rapidly, resulting in structural failure within a few years. Verification: Inspect and replace the sacrificial anode rod every 3 to 5 years to prevent premature tank rusting.
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