Should I flush a 15 year old water heater?

Author: Dr. Julian Runte  |  Last update: Thursday, January 22, 2026

If neither you nor a professional have flushed your water within the last five years, Water Heaters Now recommends not flushing it yourself. If you flush a water heater that already has a significant sediment buildup, it can actually cause more problems.

What happens if you don't flush your water heater?

Shortened Lifespan: A water heater that isn't flushed regularly may experience corrosion and other damage more quickly, leading to a shorter overall lifespan. Water Quality Issues: Sediment can affect the taste and quality of the water, potentially leading to discolored or foul-smelling water.

Is 15 years old for a water heater?

Water Heater Lifespan

If your tank water heater is more than 10 years old, it may be time to consider replacing it. With proper maintenance, a tank water heater tank should last six to 12 years. A tankless water heater can last for more than 20 years. Check your water heater's warranty for the most accurate timelines.

Is it bad to drain an old water heater?

Yes, it is generally recommended to drain your hot water heater once a year. This maintenance task helps remove sediment buildup, which can affect the efficiency and lifespan of the heater. Here are some benefits of annual draining:

Should you replace a 16 year old water heater?

It's generally a good idea to replace a water heater before it fails if it's reaching the end of its expected lifespan (usually around 10-15 years). Replacing it proactively can prevent potential water damage and inconvenience when it does fail.

Does a Water Heater Really Need to be Drained and Flushed?

Can a 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.

How do you know when a hot water heater needs to be replaced?

6 Signs It's Time to Replace Your Water Heater
  1. If your Water Heater is 10 years old or Showing Signs of Age. ...
  2. You are Experiencing Discoloured Water. ...
  3. Your Water Heater makes Unusual Noises. ...
  4. The Hot Water Tank is Leaking. ...
  5. There is Inadequate Heating. ...
  6. There is Sediment or Sand Build Up in your Water Heater Tank.

Is it better to flush or drain your water heater?

It is recommended that you flush your water heater at least once per year. Doing so will help to prevent the potential problems that sediment can bring over time. Typically, it takes one to two hours to flush a water heater. The size of your tank will impact the amount of time it takes to drain.

How do I know if my water heater needs to be flushed?

Keep an eye out for debris suddenly showing up in your water. If you notice sediment or any brown sludge coming out of your faucet, that's probably an indication that it's time for a water heater flush. If you see any of these signs, it's a good indication that your water heater needs maintenance.

How do you flush an old water heater?

Flushing your water heater
  1. Turn the cold water valve (water supply) off. ...
  2. Turn the power off.
  3. Attach a garden hose to the drain valve (water spigot) at the bottom of the water heater. ...
  4. Open a hot water tap on the main floor in your house (or on a higher floor than your water tank). ...
  5. Open the hot water tank drain valve.

What brand water heaters last the longest?

Bradford White water heaters are known for their durability and sturdy construction, providing lasting performance for years. In business since 1881, the company has a long reputation for selling quality products for both residential and commercial use.

Does age of water heater affect home insurance?

Age of the Water Heater: Insurance companies may reduce coverage for water heaters beyond a certain age, typically around 12-20 years. Older water heaters are more prone to leaks, corrosion, and other issues, increasing the risk of damage.

Should you 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. If you flush a water heater that already has a significant sediment buildup, it can actually cause more problems.

How much does it cost to flush a water heater?

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.

How do I know if my hot water heater is full of sediment?

Symptoms of Sediment in Your Hot Water Heater
  1. There is no hot water.
  2. The water temperature fluctuates.
  3. Popping or rumbling noises coming from the tank.
  4. Your hot water looks rusty and smells bad.
  5. There are small leaks near the water heater drain valve.
  6. Water takes a long time to heat up.

What happens if a water heater is not flushed?

-Reduced Efficiency: As scaling collects at the bottom of the tank, your water heater will become less effective at heating the water in the tank. -Corrosion: If your water heater goes long enough without a proper flush, you could also have corrosion attacking the tank itself, weakening its structural integrity.

How often should I change the anode rod in my 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.

What are the signs of water heater going bad?

Water heaters show several signs of going bad, including lack of hot water, temperature fluctuations, decreased water pressure, strange noises, rotten egg smell, visible leaks, rusty or discolored water, and increased energy bills. If your water heater is over 10 years old, it may be time to consider a replacement.

Will a plumber flush a hot water heater?

Expect your local plumber to have a minimum charge for servicing your water heater. It takes around one to three hours to flush a water heater, so you'll spend between $45 and $600 if you hire a professional.

Do I need to turn off gas to flush a water heater?

Step 1: Turn Off the Heating Source

You should turn off your water heater's heat source before flushing it to reduce the risk of scalds.

How long to run water to flush a water heater?

On average, flushing a water heater takes about one to two hours, depending on the tank size and the amount of sediment to be removed. This is slightly longer than it takes to drain the tank as you add another step to the process.

How long does it take for a plumber to replace a hot water heater?

Once you decide to (or are forced to) replace your current water heater, there are a few decisions you need to make to get the process started. If there are no issues or complications, a licensed plumber should be able to complete the process in 2-3 hours.

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.

Is a tankless water heater better?

Because tankless water heaters are more efficient, they cost less money to operate. This can save you money in the long run since utility bills are lower than with a tank water heater. Many people find that the cost savings in energy usage eventually makes up for the higher initial cost of a tankless heater.

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