How Much Does It Cost to Flush a Water Heater? [2026 Data]

Your average water heater flush cost falls around $160, with most prices ranging from $110 to $200 depending on several factors. If your water heater sounds like a new garage band’s drum solo and is accompanied by lukewarm temps, it’s probably time to flush your water heater. Here’s a close look at the different aspects that can impact your water heater flush cost to help you budget.

Water Heater Flush Cost Breakdown 

The cost to flush a water heater can depend on the type of water heater, tank size, materials, labor, and more. Use the following breakdown to help you navigate the cost of your water heater flush. 

Types

Choosing the best water heater type for your home is already a decision that can impact costs, but maintenance costs like flushing your water heater can also be affected by which one you choose. Overall, tankless water heaters cost $75 to $100 more to flush than tank water heaters due to the different water heater components. 

Tank Size

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. 

Your water heater’s capacity can increase or decrease the time it takes to wait for the water to cool, drain the tank, flush the tank with cool water, and refill it during the flushing process. This means that larger water heater tanks could cost more to flush if you hire a plumber who charges by the hour. The number of people in your home affects the size of your tank, so larger households may cost more to flush a water heater than smaller households. 

Here’s a closer look at water heater sizes and the typical price range that goes along with each size.

Labor

Plumbers cost anywhere between $45 and $200 per hour, depending on experience. Not all plumbers charge by the hour, however. Some plumbers charge a flat rate fee ranging from $100 to $400. 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.

Level of Expertise

Again, the more experience your plumber has, the more you may end up paying to flush your water heater. Apprentice plumbers charge the least, master plumbers charge the most, and journey-level plumbers charge somewhere in between.

• Apprentice: $45–$90 per hour

• Journey-level: $70–$120 per hour

• Master: $90–$200 per hour

Location

Regions with harder water may need more frequent water heater flushing to keep sediment out of the tank. You can learn how to test water hardness to see how hard your tap water is and determine how often you should flush your water heater. 

Water Heater Flush Cost by Type

Choosing between a tankless vs. tank water heater is already a decision that can impact upfront costs, but long-term maintenance costs like flushing your water heater can come with additional expenses worth considering. 

Tank Water Heater Flush Cost

Your conventional water heater is a tank-style water heater. The cost to flush a tank water heater ranges between $75 and $150. These water heaters are cheaper to flush overall because of how simple the process is. However, flushing your tank means you'll need to refill the entire tank with water and use energy to heat the new water once it's full. 

A tank water heater costs between $600 and $2,500 to install, and its cheaper price tag for flushing the tank means you’ll save in maintenance and upfront costs. However, tank water heaters are less efficient than their tankless water heater counterparts. 

Tankless Water Heater Flush Cost

Overall, tankless water heaters cost more to flush than traditional water heaters. This is because they are more complex than traditional water heaters and may need more frequent flushing to help curb limescale and sediment buildup. As such, you’ll spend anywhere between $150 and $250 on average to flush your tankless water heater.

Tankless water heaters cost between $1,400 and $3,800 to install, but their energy efficiency means you could conserve anywhere from 8% to 34% more energy than your traditional storage tank water heater, according to Energy Saver. 

Water Heater Flush Ongoing Expenses

On top of your up front cost for flushing a water heater, you also have several ongoing expenses to keep in mind, including maintenance and repair costs.

Maintenance 

A one-time visit could cost more than a contract with a local water heater company. Some professionals offer discounts on annual, seasonal, or monthly contracts. Investing in routine maintenance for your water heater can also help you catch issues as soon as they arise. 

During a routine water heater tune-up, your pro may offer to flush your water heater, inspect the heater, and repair your unit as needed. You may even receive discounts on Services by signing up for a plan. 

Repairs

Repairing a water heater costs between $225 to $1,000 on average, depending on the scope of the repair. Tankless water heaters fall at the higher end of the price point on average, though a water heater leak in your tank can stack up in cost. If your pro notices issues with your water heater while conducting a routine inspection, then they might need to repair your water heater on top of flushing the system. 

Why You Should Hire a Water Heater Flushing Pro

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.

Cost of Common Water Heater Flush Add-Ons

If you decide to work with a plumber to flush your water heater, they might offer additional services—sometimes at discounted rates if you bundle them together. Most plumbers are happy to check your home for leaks, install water softeners, inspect wells, and more. Here are just some of the services your local pro may provide. If you have plumbing concerns or questions, be sure to discuss add-on services with your pro. 

• Water softener installation cost: $200–$6,000 

• Well inspection cost: $250–$550

• Pipe leak repair cost: $300–$850

• Plumbing repair cost: $75–$4,000

• Toilet installation cost: $225–$550

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

• Reducing your water consumption 

• Replacing the anode rod every three to five years

• Investing in a water softener system to prevent minerals from developing in the first place

How Angi Gets Its Cost Data

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. 

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