In 2026, the national average cost to flush a water heater is $160. Most homeowners pay between $110 and $200, with the spread driven by tank size, water heater type, and local labor rates. If your water heater is making noise or delivering lukewarm water, it's likely time to schedule a flush.
Water Heater Flush Cost: What Determines the Price?
The cost to flush a water heater depends on several factors, including the type of water heater, tank size, materials, and labor. Here is a breakdown of how each factor affects the price.
Types
The type of water heater you own is one of the biggest factors in your flush cost, with tankless models running $75 to $100more than tank-style units due to their complex components. Flushing costs vary by water heater type, as shown in the breakdown below:
Water Heater Type
Average Cost Range in 2026
Average Cost in 2026
Tank water heater
$75–$150
$115
Tankless water heater
$150–$250
$200
Guide to Water Heater Installation
Tank Size
Tank size directly affects your flush cost, with a 30-gallon tank averaging $90 to $120 and a 70-gallon tank running $180 to $250. Larger tanks take longer to cool, drain, and refill, increasing labor time for plumbers who charge by the hour. Household size determines tank capacity, so larger families with bigger tanks should expect to pay more. Water heater flushing costs vary by tank size and number of residents, as shown in the breakdown below:
Number of Residents
Water Heater Capacity (Gallons)
Price Range in 2026
1–2
30–40
$90–$120
2–4
40–50
$120–$150
3–5
50–60
$150–$180
5+
60–80
$180–$250+
Labor
Plumbers cost$45 to $200 per hour depending on experience, though some charge a flat rate of $100 to $400 instead. Since flushing a water heater typically takes one to three hours, expect to spend $45 to $600 in total labor if you hire a professional. Your local plumber may also apply a minimum service charge, so confirm that detail when requesting a quote.
Level of Expertise
Your plumber's experience level shapes the hourly rate you pay, ranging from $45 to $90 per hour for apprentice plumbers, $70 to $120 per hour for journey-level plumbers, and $90 to $200 per hour for master plumbers.
Location
Where you live can affect how often you need to flush your water heater, since regions with harder water accumulate sediment faster and may require more frequent service. You can learn how to test water hardness to gauge your tap water's mineral content and use that information to determine how often you should flush your water heater.
Water Heater Flush Cost by Type: What Changes the Price?
Vladimir Gerasimov / iStock / Getty Images
Choosing between a tankless vs. tank water heater affects not only your upfront installation cost but also your long-term maintenance expenses, including what you pay each time you flush the system.
Tank Water Heater Flush Cost
Flushing a tank water heater costs $75 to $150, making it the more affordable option because the process is straightforward. Keep in mind that each flush requires refilling the entire tank and reheating the new water, which adds to your energy use. A tank water heater costs$600 to $2,500 to install, so the lower flush cost means you save on both upfront and ongoing maintenance expenses, though tank models are less energy-efficient than tankless alternatives.
Tankless Water Heater Flush Cost
Flushing a tankless water heater costs $150 to $250 on average, more than a tank-style unit, because the more complex components and greater susceptibility to limescale buildup require additional care. Tankless water heaters cost$1,400 to $3,800 to install, but their energy efficiency can offset that investment by conserving 8% to 34% more energy than traditional storage-tank models, according to Energy Saver.
Water Heater Flush Ongoing Costs: What to Budget For Later
Beyond the one-time cost of a flush, budgeting for ongoing water heater expenses, including routine maintenance and potential repairs, helps you avoid higher costs down the road.
Maintenance
A one-time service visit often costs more than signing up for an annual, seasonal, or monthly maintenance contract with a local water heater company, since many professionals offer discounts for ongoing plans. During a routine tune-up, your pro may flush the water heater, inspect the unit, and perform any needed repairs. Signing up for a plan can unlock additional discounts on those services.
Repairs
Repairing a water heater costs$225 to $1,000 on average depending on the scope of work, with tankless models and water heater leaks tending toward the higher end. If your pro spots an issue during a routine inspection, repair costs may be added on top of the flush fee.
Hiring a local water heater flushing pro may cost more upfront, but it ensures your system is cleaned safely and effectively. Over time, sediment can build up in your water heater, reducing efficiency, shortening its lifespan, and potentially causing damage. Professionals have the tools, training, and experience to flush your water heater thoroughly, helping maintain optimal performance and prevent costly repairs.
Here's why it's ideal to hire a water heater flushing pro
Flushing a water heater may seem simple, but it requires technical knowledge and safety precautions. Here are some of the top reasons to work with a pro:
Technicians can safely drain and flush both tank-style and tankless water heaters without causing leaks or damage.
Pros can remove sediment buildup more effectively using professional tools and techniques.
Working with a pro ensures proper reinstallation and pressure checks to prevent malfunctions.
Professionals can spot related issues, such as corrosion, leaks, or faulty valves, before they become major problems.
Hiring a pro helps maintain efficiency, extend the life of your water heater, and reduce energy costs.
If you want to DIY prep for a water heater flush
While flushing is best left to professionals for thorough results, some prep work can make the process smoother:
Clear the area around the water heater to provide easy access.
Note any performance issues, unusual noises, or leaks to share with the technician.
Turn off power or gas supply as directed before the appointment.
Ensure you have access to a drain or bucket if needed for preliminary drainage.
Water Heater Flush Additional Costs: What to Budget For
When a plumber visits to flush your water heater, they often offer additional services at discounted rates when bundled together, covering everything from leak checks to water softener installation. Common add-on costs include:
If you have any plumbing concerns, discuss add-on services with your pro during the appointment.
How You Can Save Money While Flushing a Water Heater
Flushing a water heater can add up, especially if you have very hard water or a high demand for hot water. Fortunately, there are several steps you can take to lower the cost of flushing a water heater, including the following:
Flushing your water heater yourself
Purchasing a flush kit for your tankless water heater
Staying on top of your water heater maintenance
Hiring a handyperson or apprentice plumber to save on hourly rates
Asking around for at least three quotes from local plumbing contractors to find the most competitive rates
Investing in a water softener system to prevent minerals from developing in the first place
Next Steps: Finalize Your Project With a Water Heater Pro
Be ready to discuss with a pro what type of water heater you have, including tank size and fuel type, as this affects the tools and procedure needed for flushing.
If there is room left in your budget, ask your pro about add-ons like inspecting the anode rod, checking valves, or performing a full system maintenance.
Be prepared for unexpected costs, such as corrosion, sediment buildup, or minor leaks that may be discovered during the flushing process.
Plan for access and workspace needs, making sure the area around the water heater is clear and that nearby drains are available for the pro to work safely.
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
Frequently Asked Questions
Yes, flushing your water heater prevents mineral deposits from collecting in your water heater unit, which can negatively impact your system. Mineral buildup can prevent your water heater from heating up properly and cause your unit to become less efficient. This can hike up your electricity bill or even shorten the life span of your water heater.
You should flush your water heater at least once a year, with some experts recommending a schedule of every six to 12 months (e.g., once in the spring and fall). The ideal frequency depends on several factors.
If your area has hard water with high mineral concentrations, you should flush the heater more often—typically every four to six months. Additionally, a water heater that is used frequently may require more frequent flushing than one that is used less often.
Regular flushing is important because it removes sediment buildup from the bottom of the tank. This maintenance helps improve the heater's efficiency, extend its lifespan, and prevent issues like clogs, overheating, and increased energy consumption. You can either learn to perform this task yourself or arrange for a service plan with a professional plumber.
It might be time to flush your water heater if you hear strange noises coming from the tank, reduced hot water flow, or discoloration in the water. These signs usually indicate a sediment buildup in the tank, which can impair your heater’s performance. Regular flushing will help remove this sediment, improve your water heater’s efficiency, and extend its operational life. You should flush your water heater one to two times per year to prevent sediment buildup.
Water heater services reviews from real Angi homeowners in Columbus, OH
5.0★ avg. • 7 total reviews
Marwan T.
5.0
10/2026
If you’re good people wanting to do business with good people, hire Matt. He is a consummate professional and utterly competent. He installed a water heater in my home at a price that beat competitors by hundreds of dollars with a promise to support the unit for its life (even after its 6 yr...
Mike Z.
5.0
11/2025
As usual with ECO, tech Jordan was outstanding, very professional, very knowledgeable, and very thorough with repairs made to tankless water heaters. Very highly recommend ECO!!!
Michael S.
5.0
07/2021
Did a great job replacing the ice maker and water regulator on my refrigerator. He was quick and thorough, very friendly and professional. If I needed a heart transplant I'd want him to do it!!!
Maria C.
5.0
05/2020
We had a gutter blockage that was causing water to sheet down the side of the house and ultimately it started to come in at a window (need mortar people next). Called around 7:30am, and he responded by 8am. He was able to come out the same morning and do a look over and clean out. He also...
Brad S.
5.0
04/2020
Scott checked our large crawl space for mold and water infiltration and recommended a viable solution. The crew was efficient and they cleaned up well after the job. The job was expensive but I am confident that I won't have to deal with the problem again. Highly recommend.
Ann S.
5.0
08/2019
They were the most through inspecting the water system in my house. Even going the extra mile to get the water professionally tested for contamination.
Thomas M.
5.0
12/2017
Very well. Have already used them again to fix hot water heater
Mike B.
5.0
08/2017
The Paul Davis team was very professional and went the extra mile to take care of my water damage. The work was very high quality and done in a timely manner. I would highly recommend their services.
Gene S.
5.0
07/2015
Honesty is hard to find in business today. GBR met me today at a 3 story building regarding my being told that I needed to tuckpoint the brick because of water leaks. The owners took the time to evaluate the situation and advised me that I did not need their service at all. They pointed me...
Stewart W.
1.0
03/2015
They unclogged the drain and sent me a bill for more than 4 times what I paid before. I called the Water Works to ask why the bill was so high and that they should have gotten my authorization before assuming they could make expensive decisions like that on my behalf and for their benefit....
Scott Dylan Westerlund has been writing about homes and real estate for almost ten years. In addition to Angi and HomeAdvisor, he's written for Today's Homeowner, Homedit.com, Flyhomes, and HomeLight.
The homeowners guide to water heater services
From average costs to expert advice, get all the answers you need to get your job done.
Looking to replace or upgrade your water heater? Use this water heater replacement cost guide to see what the work will cost and what factors affect your total.
Running out of hot water too quickly or hearing strange noises when you call for hot water? Use this water heater repair cost guide to see what a fix will cost.
You may wonder: How often should you drain your water heater? This guide explains how often you should flush your water heater to optimize its performance.
Your water heater is a powerhouse until it’s not! Use this guide on how to flush a tankless water heater to keep it running smoothly and providing hot water.
Service Olympians
Greene's Plumbing Services
Eco Plumbers, Electricians, and HVAC Technicians
AdvantaClean of Dublin
Hague Water Conditioning, Inc.
Paul Davis Restoration
GBR Masonry Inc
The Waterworks
