What Does an Anode Rod Do?

If you have a storage-tank water heater – which most people do – it comes equipped with an anode rod, also known as a sacrificial Anode Rod.

An anode rod is a steel core wire wrapped in one of three metals:  aluminum, magnesium, or zinc. Its proper upkeep is key to how many years of service you can expect from your water heater.

The rod is screwed into the top of your water heater. When the tank is filled, the anode rod “sacrifices” itself to protect the exposed steel on the inside of your tank. 

During this process – called electrolysis – the less reactive (more noble) metal will corrode before the more reactive (less noble) metal. Aluminum, magnesium, and zinc are all less noble than steel, meaning they will corrode before the steel, thus preserving the lining of the tank.

Anode Rod Problems

The anode rod is designed to corrode so your storage tank lining won’t.  That’s the good news.  But once it’s thoroughly done its job and becomes completed corroded,  the inside lining of your water heater tank is on its own.  Meaning it’s next in line for corrosion.  And that, of course, is the bad news.

A typical anode rod will last about 4-5 years, depending on how often you use your water heater, the temperature setting, and whether you use a water softener.  Water softeners contain salt, and too much salt only enhances the corrosion process.

Once an anode rod becomes corroded, it can and will cause one of two primary problems:

• Cause water inside the tank to rust
• Break and fall to the bottom of the tank and eventually tear away at the lining

Either problem can and will shorten the life of your water heater, which means they are better avoided in the first place.

Water Heater Maintenance:  The Key to a Longer Lifespan

The key to protecting the overall integrity of your water heater is annual system maintenance, which includes a thorough inspection of all working parts, anode rod and all.

Has it been a year or longer since your last inspection?  If so, contact Norhio Plumbing so we can keep your water heater in the game for as long as possible.