An anode rod is a crucial component inside a water heater, designed to prevent tank corrosion. It is a long metal rod (usually made of magnesium, aluminum, or zinc) that sits inside the tank and sacrifices itself through electrochemical reactions to protect the steel tank lining. This process is called cathodic protection.
Types of Anode Rods:
- Magnesium – Offers the best protection but depletes quickly, ideal for soft water.
- Aluminum (or Aluminum-Zinc) – Lasts longer but can produce an odor in some water conditions.
- Zinc-Alloy – Used to reduce sulfur smells (rotten egg odor) in water.
- Powered (Impressed Current) – A non-sacrificial rod that uses electricity to prevent corrosion.
Signs You Need to Replace Your Anode Rod:
- Rusty or discolored hot water.
- A rotten egg smell (often due to sulfur bacteria reacting with the rod).
- Water heater leaks or signs of corrosion.
- If the rod is less than ½ inch thick when inspected.
How Often Should It Be Replaced?
- Typically every 3 to 5 years, but this depends on water quality and tank usage.
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