Anode rods generally can last about three to five years but it really depends mostly on the quality of your water and how much water travels through your water heater.
The frequency of anode rod replacement depends on several factors, such as water quality, usage patterns, and the type of anode rod installed. In most cases, we recommend inspecting and potentially replacing the anode rod every 3 to 5 years.
Visual inspection. Check your water heater and water anode rod for corrosion and rust at least once per year. If the rod appears heavily worn and degraded to its core wire, it's ready for replacement.
An important part of your water heater, it moves cold replacement water to the bottom of the tank when you use hot water; otherwise, both will mix and reduce the water temperature. Anode Rod Replacement: While an anode rod costs between $20 and $50, a plumber can replace it for $50 to $150.
The rods can deteriorate in as little as 3 to 5 years, depending on many factors, including the hardness or softness of the water. Without a working anode rod, the water heater tank will be vulnerable to rust, corrosion, and other damaging effects of chemicals and minerals in the water supply.
They protect the tank by attracting corrosive elements, ensuring the integrity of the water heater's interior. Even in areas with soft water, the presence of oxygen and other natural elements can lead to corrosion, making the anode rod indispensable.
Most anode rods are sacrificial, meaning they are designed to corrode (instead of your water heater lining). Because they are meant to break down, they wear out every few years and need to be replaced.
Expect a pro to charge you between $75 and $200 to come to your home to flush your water heater, depending on where you live. While this cost deters many homeowners from performing this annual maintenance, it can extend the water heater's lifespan by years, making it worth the additional cost.
Note: If your anode rod is on the top of the heater, you will only need to allow the tank to drain about a quart or 1/2 a gallon of water. If the anode is located on the side, drain the tank until the water is below the anode rod port.
All water heaters have a minimum of one anode rod. Some water heaters have longer warranties because they have two anode rods. If there are two anode rods, that is because one is attached to a hex head at the top and the other is a combination anode attached to the hot water outlet.
Most homeowners should flush their water heaters every 6 months or so, but if you have extremely hard water, you may want to do it more often. Flushing your hot water heater could be necessary as often as every few months depending on the mineral content of your local water supply.
Your sacrificial anode may last longer, but if it's been more than 5 years since a human being even set eyes on it then you're long overdue for an inspection. That's because, in some cases in particularly mineral-rich water, the anode rod will last less than a single year – although 3-5 years of life is about average.
If your tank-style water heater can't maintain a steady supply of hot water, it might indicate the rod is bad. A deteriorating anode rod cannot manage the electrolysis process in the tank effectively, causing uneven heating of the cold water entering the tank.
If you suspect your water heater is more than 10 years old—it is time to consider replacing it before you're left with an emergency decision. To determine the age of your water heater, you'll need to identify the Brand Name and Serial Number for your unit.
In any case, water heater anode rods are essential for protecting your tank from corrosion, but they eventually wear out after around 3-5 years, depending on many factors including the hardness or softness of your water.
Magnesium rods are better for areas with soft water, while aluminum rods are ideal for hard water areas. The best water heater anode rod will depend on the specific conditions of your home's water supply.
However, most professionals recommend inspecting the anode rod every one to three years and replacing it every four to five years. If your water supply has a high mineral content or if your water heater usage is heavy, these timelines may need to be shortened.
While sacrificial anode rods are critical to the health of your water heater tank, they can sometimes create issues with smelly water. For example, a corroded aluminum or magnesium sacrificial anode rod is a common cause behind water having a rotten-egg smell.
If neither you nor a professional have flushed your water within the last five years, Water Heaters Now recommends not flushing it yourself.
Labor Cost to Install Water Heater
In general, plumbers cost $45 to $200 per hour, while electricians cost $50 to $100 per hour. Expect the following average price ranges for labor alone: Replacing a tank-style water heater: $150–$450. Replacing a tankless water heater: $600–$1,850.
In other words, it “sacrifices” itself to extend the life of the water heater. Most water heater manufacturers will recommend inspecting the condition of the sacrificial anode every one (1) to three (3) years and replacing it when it has been consumed more than 50%.
How Often Should You Replace an Anode Rod? The longevity of an anode rod depends on water quality, usage, and the material. But generally, an anode rod replacement must be done every three to five years. Check your water heater regularly to determine whether or not your anode rod needs to be replaced.
Collection of Calcium Carbonate
It is not abnormal for calcium carbonate to collect on the exterior of an anode rod in a water heater. These white minerals keep the rod from corroding. While this may be beneficial under any other circumstance, the whole point of the anode rod is to corrode to keep the water tank safe.
Magnesium is a leading anode material given its ability to best protect the steel tank. It “gives up” electrons more freely than aluminum. In some situations where water is more conductive, i.e. softened water or lower pH levels, this sacrificial process is accelerated; in those cases, aluminum is a better choice.