Traditional tank water heaters have anode nods. If you’ve noticed that your water heater doesn’t have one, it may be because you have a more modern tankless water heater. Knowing if your system has anode rods is important because these components do eventually corrode to the point of needing to be replaced.
Water heater anode rods are what we call “sacrificial” in not-so-technical terms. What this actually means is that they attract and “take on” corrosion in order to preserve the tank’s reservoir against corrosion.
Quick Takeaways
Almost all traditional water heaters have at least one anode rod.- Tankless water headers don’t typically need anode rods unless they’re hybrid models.
- If you have a commercial or specialty unit that deviates from typical residential water heaters, your system may utilize powered anode rods that can last for 20 years or more without degrading.
- On average, anode rods need to be replaced once every three to five years. Replacing your anode rod on schedule can extend the life of your water heater by years.
- If your water heater doesn’t have a functioning anode rod, it’s likely going to rust from the inside out.
Do All Water Heaters Have Anode Rods?
Yes, almost every tank water heater has anode rods to prevent corrosion within the tank. Tankless water heaters don’t need anode rods. If you have a hybrid unit, you may be scratching your head. The answer to whether or not your model has anode rods will depend on if it contains a storage tank.
Finally, there’s a little bit of confusion about anode rods in electric versus gas heaters. “How” your home’s water heater is powered won’t matter because both electric and gas models use anode rods.
Which Types of Water Heaters Have Anode Rods?
Anode rods are standard in both older water heater models and new, energy-efficient water heaters. You should assume that your unit has anode rods unless you know for certain that you have a tankless water heater
Traditional Tank Water Heaters
Both gas and electric traditional tank water heaters have anode rods. Anode rods in tank water heaters have what is considered a sacrificial design. This means that they are designed to actually corrode instead of the lining within your water heater.
Yes, that means that your water heater’s anode rod is meant to break down by design! In fact, that’s its entire purpose. By replacing your anode rod to ensure that all rust and corrosion are directed toward the rod instead of your tank, you can make your water heater unit last many more years.
The standard anode rod types in water heaters are magnesium, aluminum, and zinc. Water heater manufacturers do not make their rods interchangeable. That means you’ll need to do a like-kind replacement of magnesium for magnesium, aluminum for aluminum, or zinc for zinc.
Hybrid (Heat Pump) Water Heaters
Hybrid water heaters still have storage tanks that work in tandem with the unit’s pump mechanism. As a result, they still have anode rods that preserve their tanks from corrosion.
Tankless Water Heaters
If you have a tankless water heater at your home, you know that there’s no need for a storage tank because your unit heats water on demand. Water is activated by a flow sensor that triggers the unit’s heating element every time you use a faucet in your home. A lack of a tank means there’s no need for a sacrificial rod within the unit.
What Does an Anode Rod Actually Do?
Your water heater’s anode rod allows for something called sacrificial corrosion within the tank. Made from magnesium, aluminum, or zinc, a sacrificial anode is suspended within a water heater’s tank.
It’s able to be “sacrificed” because of a process called galvanic corrosion that causes the metal in the rod to be corroded “preferentially” over the metal lining within the tank itself. In other words, the anode rod attracts all of the corrosive elements hanging around in your tank’s water to ensure the tank lining is spared.
Of course, this all means that your water heater’s anode rod will deteriorate over time by design! The average anode rod needs to be replaced once every three to five years. However, there are exceptions. If you have a particularly high-use household, your unit’s anode rod could deteriorate in just one to two years.
Orlando homeowners often find themselves replacing anode rods sooner than expected because of the quality of the water we have locally. Orlando’s public water supply is known for its hardness. A combination of naturally high mineral content, chlorine that’s added to the water supply for public safety, and a humid and warm climate that can accelerate oxidation and corrosion can make rods age out prematurely.
What Happens If a Tank Water Heater Doesn’t Have a Working Anode Rod?
A lack of an anode rod means internal tank corrosion. If it’s been three years since your rods have been swapped out, it’s already time to get the job done.
Here are some other signs that your anode rods have either already deteriorated or are on their way out:
- Rust-colored water
- Metallic smells coming from faucets
- “Rotten egg” smell
- Unusual noises, rumblings, or loud popping sounds
- Your water heater suddenly malfunctions
- Your tank is leaking
If you’re noticing anything unusual with your home’s water supply or your water heater unit, it’s important to get the problem looked at and repaired right away. A deteriorated anode rod poses major risks for flooding and water damage at your home. In addition, it could cause premature failure of your water heater.
How to Tell If Your Water Heater Has an Anode Rod
It’s okay if you can’t quite remember if your water heater model has an anode rod. The simplest way to check is just to look at the manufacturer’s specifications. Look to see if your model is a tank or tankless unit. Remember that all traditional tank water heaters do normally have anode rods.
You can also just glance at your water heater to see if you can spot the anode rod right at the top of the unit. Most anode rods look like hexagonal metal nuts that are screwed right into the tank. You might have to look under a plastic cap or some insulation to spot yours.
If you don’t feel comfortable digging in to take a look, simply call a plumber to help you out. Resist the temptation to try to unscrew or pull out the anode nod to see how it looks. There’s actually a risk for a massive leak or rapid rusting if the rod is displaced. You could also accidently rip the threads connecting the rod to the tank.
How Long Do Anode Rods Last?
A typical anode rod lasts three to five years before it needs to be replaced. If you have hard water like most Orlando residents, you may need to change out your anode rods as often as once every two years. Homes that have water-softening systems also generally need anode rods changed more frequently.
Finally, high-usage homes often need anode rods replaced once every one to three years simply because the extra strain put on the tank causes erosion much sooner.
Can You Replace an Anode Rod Instead of Replacing the Water Heater?
Yes, anode rods are actually meant to be replaced by design. Of course, replacing an anode rod is only appropriate when you have a newer or fully functioning water heater. On average, a water heater can be expected to last between eight and 15 years. You may be told that replacing your water heater is the best bet if the model has aged out or the tank’s damage is already too advanced.
Most people pay between $100 and $300 to have anode rods replaced. Exact costs can vary based on the number or anode rods in your unit or how complicated accessing anode rods is with your specific water heater model. By comparison, the cost to replace a traditional tank water heater is between $600 and $3,000 for various models.
When to Call a Professional for Anode Rod or Water Heater Repair
Don’t ignore any changes to your water’s coloration or smell. In addition, any strange noises, signs of leaking, or abrupt performance changes in your water heater should be addressed.
If your anode rod is past its recommended “change” date, you may also notice that it’s actually stuck to the tank due to heavy corrosion. This will require gentle and strategic force that’s best left to a professional plumber with experience with replacing anode rods. Being too forceful could damage your tank.
When it comes to anode rods, a professional inspection never hurts. A local plumbing pro can make sure you’re replacing an anode rod on time with the right like-kind model. Plus, professional inspection protects your water heater’s warranty.
Frequently Asked Questions
Do electric water heaters have anode rods?
Yes, any electric water heater that has a tank will generally have anode rods.
Do gas water heaters have anode rods?
Yes, all tank-style water heaters that are also gas heaters generally have anode rods.
Do tankless water heaters have anode rods?
No, anode rods aren’t needed with tankless models because there’s no water storage.
How often should an anode rod be replaced?
Every three to five years for most cases.
Can a water heater work without an anode rod?
While a water heater can technically continue working without an anode node, this will lead to heavy corrosion of the unit’s tank. In addition to posing big risks for leaking and water damage, this will also cause your water heater to fail prematurely.
Is replacing an anode rod worth it?
Yes, replacing an anode rod is a great way to preserve the performance and lifespan of a water heater that is still structurally and mechanically sound.
Schedule Water Heater Repair with Benjamin Franklin Plumbing
Let’s make sure your anode rods are in great shape! At Benjamin Franklin Plumbing, we help Orlando homeowners fight back against hard water with routine water heater cleaning and maintenance. If there’s anything suspicious with your anode rod or other part of your water heater, we can provide fast and reliable repairs.
We’re also here for emergencies that just can’t wait! Benjamin Franklin Plumbing serves customers all throughout Orlando, FL and nearby areas. Just call today or book an appointment online to get trusted local plumbers in Orlando at your door. Benjamin Franklin Plumbing is the Punctual Plumber!