Tank Water HeaterMaintenance2025-09-04
Anode Rod and Tank Corrosion Explained
The sacrificial anode rod protects your tank from rust — replacing it can double tank life.
The anode rod is the most important and least-known part of your water heater's longevity. It corrodes so your tank doesn't.
How it works
The 'sacrificial' anode rod attracts corrosion to itself, protecting the steel tank. Once it's used up, the tank starts corroding and its life rapidly shortens.
When to replace it
Checking the anode rod every few years and replacing it when depleted can significantly extend tank life — often a fraction of the cost of a new heater.
Key takeaways
- The anode rod protects your tank from rust
- Check it every 2–3 years
- Replacing it extends tank life
- Hard water depletes it faster
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