An aluminum anode is a sacrificial rod used in water heaters to protect the tank from corrosion. Through electrolysis, the anode corrodes first, helping the tank last longer. Aluminum anodes are typically less expensive and last longer than magnesium, but may be less effective in hard water.
/ˈæl.jə.mɪ.nəm ˈæ.noʊd/
An aluminum anode is a sacrificial rod used in water heaters to protect the tank from corrosion. Through electrolysis, the anode corrodes first, helping the tank last longer. Aluminum anodes are typically less expensive and last longer than magnesium, but may be less effective in hard water.
What does an aluminum anode do in a water heater?
It sacrifices itself to corrosion so the tank lasts longer, helping prevent leaks and premature failure.
Source: The Cooling Company
The anode rod corrodes so the tank does not.
Many residential water heaters use aluminum anodes, and replacing a worn rod can prevent tank corrosion and leaks.
Inspect the anode rod regularly. If more than 6 inches of core wire is exposed, it’s time to replace it.
“Inspect the anode rod regularly. If more than 6 inches of core wire is exposed, it’s time to replace it.”
Some heaters use combination anode rods made of aluminum and magnesium for broader protection.
How do I know if my anode rod needs replacing?
If more than 6 inches of the steel core is exposed or the rod is heavily pitted, it should be replaced.
Is aluminum better than magnesium anodes?
Aluminum lasts longer and costs less, but magnesium often performs better in hard water.
Can I replace an anode rod myself?
It’s possible with the right tools, but a professional can ensure proper fit and avoid tank damage.
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