Are Powered Anode Rods Better than Sacrificial Anodes?
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Do you have a problem with stinky hot water that smells like rotten eggs, or corrosion, or sediment build-up? Are you looking for a long-term solution and want to prevent water heater failure and expensive service?

If so, you may be interested in learning about powered anode rods, a potential solution that can provide long-term protection against these issues. By replacing traditional sacrificial anode rods with a powered option, you can prevent sediment buildup, reduce corrosion, and potentially avoid costly repairs. In this article, we'll explore the advantages and disadvantages of powered anode rods, and why they may be the right choice for your water heating needs.

What is an anode rod, and what does it do? What are the options?

An anode rod is a vital part of your water heater, designed to extend the life of a heater by protecting it from corrosion.

If you have a tank-type water heater powered by gas or electricity, and you have an issue with the stinky hot water smell or premature rusting followed by a leaky tank, your anode rod might not be functioning properly.

A sulfur smell, often described as rotten egg odor, is a common issue, especially if you live in an area with low-quality and hard water. While the smell is not a significant problem, rusting can lead to leaks and significantly decrease the unit's lifespan.

A typical water heater comes with a metal tank covered with a protective glass coating and an anode rod as a secondary method of protection. The anode rod is also called sacrificial because it deteriorates over time, sacrificing itself for the greater cause of protecting metal components from water, oxidation, and corrosion.

Most models come with magnesium, zinc, or aluminum anodes, depending on the brand and model. Homeowners can choose to buy advanced models with built-in powered anodes or replace an existing anode with this non-sacrificial one for better protection and a longer warranty.

In our article about anode rods, we explore the advantages and disadvantages of various types, including installation tips.

Here, we'll focus on powered anodes, their pros and cons, and whether they're worth buying and installing.

What are powered anodes, and why should I consider installing one?

As mentioned earlier, anode rods are metal rods that protect the water heater tank from corrosion by eroding over time. As the rod wears down, it loses its ability to protect, and it needs to be replaced.

Powered anodes, such as those made from materials like Titanium found in Corro-Protec anodes, work differently. They include a current rectifier that sends a small electrical current to the water heater. This technology can prevent corrosion, eliminate bad odor, and extend the anode's lifespan.

It's important to note that if the DC current reaches its highest value, it can cause damage to the water tank. Therefore, it's crucial to follow the manufacturer's instructions and not exceed the recommended voltage to prevent tank damage.

Powered anode rods vs. sacrificial anodes - Pros and cons

Most tank-type water heaters have a lifespan of 10-15 years, while typical sacrificial anodes have a life expectancy of up to five years, regardless of the material used. This lifespan depends on factors such as water quality, temperature, usage, and maintenance.

If you don't replace a failing sacrificial anode, your water heater's lifespan may be reduced. Additionally, a seized or broken anode can be difficult to remove.

Sacrificial anodes are an affordable and easy-to-replace option that provides effective protection for the metal tank without requiring electricity.

A typical water heater comes with a magnesium anode that is affordable but corrodes quickly. Households with hard water should consider replacing magnesium anodes with more durable options.

Aluminum anodes are a better choice as they can help reduce the rotten egg smell and have a longer lifespan. However, they're not suitable for use with soft water, such as when using a water softener.

A better option is to install a heavy-duty or powered anode that can provide long-lasting protection.

Price comparison

Magnesium and aluminum anodes are cheap. Depending on the brand, quality, and size, they can cost you between $20 and $50. While they are pretty easy to replace, you can always hire a contractor, costing you up to $150 per hour (in the US) just for labor, as reported by HomeAdvisor.

Powered anodes cost more and can be found at around $150 (as seen on amazon.com).

Powered anode rods pros

• Powered anodes can be installed in any size of a tank-type water heater.
• Long-lasting. Since powered anodes don't deteriorate, they do not have to be replaced every 3-5 years as the sacrificial type.
• No maintenance is required.
• According to some manufacturers, powered anodes can eliminate spoiled egg odor in 24 hours.
• Corrosion protection. Some types provide permanent corrosion protection.
• Reduce sediment build-up and hard water stains.
• It works well in both soft and hard water... it adapts its voltage depending on the water type.
• No need to call a plumber to clean sediments inside the tank or replace an element.

Powered anodes cons

• Expensive to buy.
• It doesn't work when there is no power.
• Not found in budget-friendly models, so replacement is required.

Powered anode vs. sacrificial - Side-by-side comparison

How do you install a powered anode rod on a water heater?

Installing a powered anode rod on a water heater is a straightforward process. These rods look almost the same as sacrificial anodes, with the addition of a terminal, wiring harness, and DC output module. The hex head and threads underneath make them easy to screw into the water heater tank, at the same location as a factory-installed anode.

To install a powered anode, you first need to turn off the power to the water heater and shut off the water supply. Then, you can remove the old sacrificial anode by unscrewing it. It's a simple process that requires minimal effort.

When installing the new powered anode, make sure to use Teflon tape to avoid enhancing corrosion due to the interaction of the stainless steel anode and the metal tank. The rectifier wiring harness has two lines; one is a grounding line that connects to the metal tank, while the other attaches to the top terminal on the anode.

Once the anode is installed and the connections are established, you can resume power and plug in the DC output module to start protecting your water heater. Overall, installing a powered anode rod is a quick and easy way to extend the life of your water heater and improve its performance.

Instructions

Here are the general steps to install a powered anode rod on a water heater:

1. Turn off the power to the water heater.
2. Shut off the water supply to the water heater.
3. Drain some water from the water heater to reduce the pressure inside the tank.
4. Remove the old sacrificial anode rod from the water heater tank.
5. Clean the area around the anode rod opening and make sure it is free from any debris or corrosion.
6. Install the new powered anode rod into the same opening and tighten it securely using a socket wrench.
7. Connect the rectifier wiring harness to the top of the anode rod, ensuring that the grounding line connects to the metal tank.
8. Turn on the water supply and refill the tank.
9. Turn on the power to the water heater.
10. Plug in the DC output module to start the anode rod's protection.

It is essential to follow the manufacturer's instructions that come with the powered anode rod for proper installation. If you are unsure about any of the steps, it is always best to consult a professional plumber.

So, are powered anode rods better?

If money is not an issue and you are looking for a long-term protection solution for your water heater, install a powered anode rod. Some manufacturers are confident about long-term rust protection and success in preventing a rotten egg smell.

Powered anodes are well worth the cost for most homeowners, but are not always the best solution for some.

Sacrificial anode rods also work well but are not that successful in controlling bacteria inside the tank; plus, they have to be replaced every 3-5 years. They are affordable, tested, and easy to install.

Either way, your tank-type water heater relies on an anode and must be functional all the time.

FAQ

How long do powered anode rods last?

Powered anode rods are designed to last for a long time, with some manufacturers claiming up to 20 years of use. Unlike sacrificial anodes, powered anodes do not deteriorate and do not need to be replaced every 3-5 years.

Can I install a powered anode rod myself?

Yes, installing a powered anode rod can be a DIY project, as long as you follow the manufacturer's instructions carefully.

Will a powered anode rod work in any type of water heater?

Powered anode rods are designed to work in most types of tank-type water heaters, including electric and gas models. However, it's always a good idea to check with the manufacturer to make sure that the anode is compatible with your specific water heater model.