When to Replace Your Anode Rod

Most water heaters fail because the steel tank rusts through. Manufacturers prevent this by installing a “sacrificial” anode rod. This rod is made of a more reactive metal (magnesium or aluminum) that attracts the corrosive elements in water, so they eat the rod instead of your tank.

But once the rod is gone, your tank is next.

Signs You Need a New Anode Rod

1. Age: If your water heater is more than 3-4 years old and you’ve never checked the rod, it’s likely time.
2. Rusty Water: If you see brown or orange tint in your hot water, the tank may already be starting to corrode.
3. Smelly Water: A “rotten egg” smell is often caused by bacteria reacting with a magnesium rod. Switching to an Aluminum/Zinc rod can solve this.
4. Air in Lines: If your faucets “spit” air when you first turn on the hot water, a depleted rod may be the cause.

How to Check the Rod

To check your rod, you’ll need a 1-1/16 inch socket and a breaker bar.

1. Turn off the water and power.
2. Drain about 2-3 gallons of water to lower the level.
3. Unscrew the hex head on top of the heater.
4. Pull the rod out.

The Rule of Thumb: If the rod has more than 6 inches of the core wire showing, replace it immediately.

Magnesium vs. Aluminum: Which is better?

• Magnesium: Best for standard water. Provides the highest level of protection.
• Aluminum: Best for hard water or areas with high mineral content.
• Aluminum/Zinc: The choice for fixing sulfur odors.

By spending $30 on a new rod every few years, you can prevent a $1,000+ water heater replacement.