There are a few parts of your water heater you should check at least once a year to keep your unit running smoothly, including the sacrificial anode rod. This is a small, removable metal stick inside your water heater’s tank. Caring for this part correctly can reduce the risk of many plumbing problems and more costly water heater repairs later. Here’s what you need to know about the anode rod and how to care for it.

Anode Rod FAQ

What is it for?

When water comes into your home, it contains impurities that can damage the inside of your water heater over time. The anode rod is made of a material that attracts these elements. The rod corrodes instead of the tank corroding and needing water heater repairs. 

This is why it’s sometimes called a sacrificial anode rod. There are also non-sacrificial options that use an electrical current to slow corrosion.

What is it made of?

There are several types of anode rods available. Sacrificial rods are usually made of magnesium, aluminum, or an aluminum/zinc blend. Electrical ones are made of titanium. All of these materials are effective in different situations.

How do I know which type I need?

Having your water tested will tell you what impurities are most common in your water supply, which will tell you which type of anode rod to use. An aluminum or aluminum and zinc rod is the best option if your water is high in sulfates because these can combine with magnesium to create a rotten egg scent. 

If the water is high in chlorine, choose magnesium, because aluminum and chlorine create a sticky gel that may seep into your pipes. If your water is high in iron and iron-loving bacteria, an aluminum/zinc option can help keep the bacteria from growing.

When should I change my anode rod?

Depending on your water quality and the type of rod you choose, it will need to be changed every four or five years. Keep an eye on the water quality; discoloration or a change in the smell can alert you if you need a new anode rod or other water heater repairs. Otherwise, check on the anode rod once a year; when it is corroded enough that you can see the central core, it’s time to replace it.

If you need help locating or changing your anode rod, or you need other water heater repairs, contact Ray's Heating, Plumbing, Electric in Salmon, ID. Serving Lemhi, Custer, and the surrounding counties, this family-owned and -operated plumbing repair provider offers 24/7 emergency service and has 45 years of experience on the job. Call (208) 756-3649 or visit their website to make an appointment.