The lifespan of a storage water heater largely depends on an inconspicuous metal rod—the magnesium anode rod. It silently protects the inner tankof the water heater by uniquely "sacrificing itself."

 Its working principle is based on the electrochemical concept of cathodic protection. Since the main component of the metal tank, iron, is chemically more stable than magnesium, when corrosive substances are present in the water, the magnesium anode rod preferentially reacts with anions (such as chloride ions and carbonate ions), thereby corroding in place of the inner tank (cathode). This process is akin to the magnesium rod acting as a "substitute," consuming itself to delay the corrosion of the inner tank. 

If the magnesium anode rod is exhausted and not replaced in time, the inner tank will lose its protective layer and begin to corrode directly. While there may be no obvious symptoms in the short term, the risk of tank perforation and leakage increases significantly over time, often resulting in repair costs far exceeding the expense of replacing the magnesium rod. 

Recommendations:For most households, it is advisable to have a professional inspect the magnesium anode rod every 1-2 years. In areas with hard water, the inspection interval should be shortened. If the diameter of the magnesium rod has depleted by more than 60%, it should be replaced promptly. This is the most economical and effective way to extend the service life of a water heater.

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