How often should I replace the anode rod in my water heater?

Author: Mallie Friesen  |  Last update: Wednesday, April 9, 2025

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.

How do I know when my anode rod needs replacing?

Poor water heater performance can sometimes stem from an anode rod that's overdue for replacement. If you notice signs of poor performance, such as discolored or rusty water, sulfuric or rotten egg smells, popping sounds from the tank, or high heating bills, inspect your water rod to determine if it needs replacement.

How do you know if your anode rod is bad?

Top 3 Signs of Anode Rod Failure
  • Rusty or Disintegrating Anode Rod. Regular inspection of the anode rod is crucial to identifying signs of failure. ...
  • Foul Smell or Discolored Water. Another sign of anode rod failure is foul-smelling water or discolored water, often appearing brownish or rusty. ...
  • Noisy Water Heater.

How much does a plumber charge to replace an anode rod?

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.

What happens if you don't replace the anode rod in a water heater?

The anode rod attracts corrosive elements, such as oxygen and hydrogen sulfide, which would otherwise corrode the walls of your hot water tank.

How often do you recommend changing water heater anode rods?

What is the life expectancy of an anode rod?

The frequency of anode rod replacement can vary based on factors like water quality, the volume of water usage and the type of rod used. However, most professionals recommend inspecting the anode rod every one to three years and replacing it every four to five years.

How often should I flush my water heater?

Should you drain your hot water heater every year? Yes, but that's really just the bare minimum. You should really drain and flush your water heater twice-per-year: once in the spring, and then again in the fall. The reason why comes back to what a water heater is flushing out: minerals and sediment.

How much does it cost to replace a 40 gallon water heater?

For example, the average 40-gallon water heater installation cost runs between $1,000 and $2,500, while its 80-gallon counterpart runs between $2,650 and $3,910.

What is the life expectancy of a water heater?

While today's water heaters are better designed than older models, they still require regular maintenance in order to prolong their lives. With regular inspection, draining, and flushing, you can expect a gas water heater to last anywhere from 8-12 years and an electric water heater to last anywhere from 10-15 years.

Do water heaters have 2 anode rods?

Installation and Positioning: Anode rods are typically screwed into the top of the water heater tank. Most residential water heaters have one, but larger tanks or those with higher hot water demand may have two. It's crucial for the effectiveness of the rod that it remains fully submerged in water.

How do I know which anode rod to buy?

Selecting your new anode rod should be based on your water's condition and your budget. For example, to get rid of bacteria causing your water to smell foul, go with a zinc/aluminum or electric anode rod. For the most economical choice, magnesium is the way to go – but be ready to replace it again in a few short years.

How long does it take to replace an anode rod?

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.

What is the white stuff on the anode rod?

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.

What is the best anode rod?

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.

What does a bad anode rod smell like?

This bacteria can produce hydrogen sulfide gas, which has a distinctive "rotten egg" smell. In some cases, the anode rod can also become clogged with minerals and other debris, which can further contribute to the problem.

Does replacing the anode rod extend the life of a water heater?

Instead, the anode rod gradually corrodes in place of the steel tank, extending the water heater's lifespan. In most cases, owners will need an anode rod replacement only about once every 3 to 5 years.

What is the longest lasting water heater brand?

Its award-winning construction makes the Rheem® Marathon® water heater the most durable electric water heater ever made. And its industry-best warranty makes it a smart purchase you can count on for years to come.

Can a tank water heater last 20 years?

The life expectancy of a hot water tank varies depending on its size, how often it is used, and how well it is maintained. A standard 40-gallon tank will last between 10 and 15 years while larger tanks (50 gallons) have a lifespan of up to 20 years.

Why do plumbers charge so much to replace water heater?

This is because the process of installing a new water heater can be quite complex and often requires the use of special tools and equipment. Additionally, the cost of labor for this type of project can be quite high.

How long of a shower can you take with a 40-gallon water heater?

For instance, a typical shower uses about 10 gallons of hot water. So, if you have a 40-gallon hot water tank, you should be able to get four average-length showers out of your hot water tank. This also depends on how much hot water you use for other things.

What happens if you never flush your water heater?

Over time, the number of sediment increases, leading to problems with the water heater. Sediment can begin the process of corrosion and can clog the valves inside the water heater tank, leading to leaks and other issues. Both of these problems decrease efficiency and can result in costly repairs.

Should I flush a 15 year old water heater?

If neither you nor a professional have flushed your water within the last five years, Water Heaters Now recommends not flushing it yourself.

How much does a plumber charge to flush a water heater?

The national average cost to flush a water heater is $160, but prices can vary in increments based on the tank size. A 30-gallon tank will cost between $90 and $120 on average, while a 70-gallon tank could cost anywhere between $180 and $250.

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