To protect a water heater from rusting, you must proactively inspect and replace the sacrificial anode rod every 3 to 5 years. The anode rod is an essential component made of magnesium or aluminum that attracts corrosive minerals in the water, sacrificing itself to prevent the steel tank walls from oxidizing. Additionally, maintaining your water heater at a safe operating temperature of 120°F to 140°F and performing annual sediment flushes will significantly reduce internal electrochemical corrosion and prolong the unit's lifespan. Verification: Check the anode rod condition annually and replace it when heavily depleted.
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