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How Much Does It Cost To Repair A Boiler?

Typical Range: $185 - $585

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Repairing your boiler will cost about $371 on average. Most homeowners spend between $185 and $585. The location of the unit, broken parts, and several other factors can drive that the price above $1,000 in some situations.Most water-based heating systems need regular maintenance and repair to continue working efficiently. These systems are relatively efficient but not always easy to fix. Hiring the right professional is essential to fix these complex systems and keep your home comfortable.

On This Page:

  1. Service & Repair Prices
  2. Common Issues
  3. Part Replacements
  4. Cleaning
  5. Maintenance Cost Factors
  6. How Do Boilers Work and Who Fixes Them?
  7. DIY vs. Hiring a Pro

Boiler Repair Cost Calculator

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National Average
Typical Range
$185 - $585
Low End - High End
$95 - $1,027

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Cost data is based on actual project costs as reported by 3,603 HomeAdvisor members in .

Boiler Service and Repair Price Comparison

Common issues will range from $300 and $500 to restore full functionality. Most professionals charge by the hour and add replacement material costs. Some charge a materials-included flat-rate for the project. Prices can exceed the average price based on the factors discussed in this guide.Hourly prices average between $60 and $80, but will change depending on:
  • Nature of the problem
  • Geographic location
  • Seasonal demand
  • Appointment timing
  • Boiler type

Gas Boiler

Gas-fired units typically cost between $100 and $400 to repair. They are common in households with access to a gas main line. This option is reliable, and issues are most commonly related to the expansion tank or water circulation pump. Leaks occasionally become a problem, and should be resolved quickly.


Expect to spend between $200 and $500 to fix your oil-fired product. Especially in rural areas where gas main lines are not available, oil boilers are a common alternative. They are more energy efficient, but are usually more expensive to repair than gas. Clogged burner nozzles or fuel pipes are the most common problems. The heat exchanger can crack due to the heat.


When repairs are necessary, prices range between $200 and $400. Electric boilers are not as powerful or energy-efficient as oil or gas. Its benefits include simple installation, space-saving size, and less maintenance.

Need Your Boiler Fixed? Hire a Pro.

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Common Issues Requiring Repair

Individual units usually perform reliably for years because they have few mechanical parts. The most common problems occur in the expansion tank or a circulator. Problems can include no heat, poor heat production or leaks. Potential causes include improper water levels, mineral deposits, or a pilot or burner ignition malfunction.
ProblemPotential CauseDIY Material CostPro Repair Cost
Won't runIgnitor switch$50 - $1,500$200 - $2,000
Heats incorrectlyMineral deposits$10 - $40$140 - $250
Increased energy useFaulty circulator, ductwork, radiators$150 - $350$250 - $500
Clanking noisesFaulty expansion tank$40 - $130$100 - $250
Water or gas leaksFaulty pipes, valves, or circulator$140 - $400$200 - $600
Most home improvement stores sell DIY kits that allow you to restore the problem yourself. Don't try to fix a hot water system unless you're sure about the problem at hand and how to solve it. When in doubt, hire a professional. This will keep you and your home safe when working with electrical systems, gas, or water.

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Replacement Costs – Valves, Tank & Other Boiler Parts

For some parts, replacement is better than repair. In each case below, a new part will typically save on costs and is safer than trying to work with the existing, damaged, or worn-down part.
Average Replacement Boiler Part Costs
PartFunctionEstimated Cost
Zone ValveControls the flow of water or steam$60 - $100
Diverter ValveProvides heat to the radiators$100 - $150
Gas ValveControls the flow of gas to the burner$100 - $200
Expansion TankProvides cushion for expanding water when heated$40 - $60 (gas), $90 - $130 (oil), $55 - 80 (electric)
PipeTransports water and fuel to and from boiler$10 - $30 per linear foot
Circulator PumpPumps heated water through the house$140 - $200
Ignitor SwitchLights the burner to turn your fuel into heat$20 - $70

Replacing individual parts allows you to increase the sustainability of your system. Eco-friendly boilers and radiators allow you to drive down your energy expenses, while making your home environmentally friendly. An energy-saving, eco-friendly expansion tank or circulator can add up to 20 percent to the lowest price in the chart above.

Repairing or replacing individual parts becomes less affordable when multiple parts break down at the same time, or your system is older and no longer efficient, it might be time to think about a new unit. In that case, start by researching the cost to install a new boiler.

Find a Boiler Repair Service Near You.

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Boiler Cleaning Costs

Cleaning your product is relatively simple. It costs between $150 and $300 per professional service. Left alone, it can turn from a crucial HVAC appliance to an unreliable and potentially dangerous unit in your home. Regular cleaning and tune-ups ensures that no minerals build up and the system will run reliably when needed.Prices vary depending on your location, the accessibility and type of product. Clean it at least once per year, ideally after the most high-usage winter season. Biannual cleanings are recommended for colder climates or longer cold periods in fall and spring.

Average Maintenance Cost Factors

The best way to keep prices down is to perform regular check-ups on your system. Most problems that occur are "nickel and dime" expenses that quickly add up. It's usually less expensive and less of a hassle to fix your boiler than it is to replace it.Most products last 20 years or more. By keeping the unit in working order, you won't find yourself in a cold shower facing an emergency that needs an immediate fix. Some insurance agencies offer "boiler insurance" that can help you alleviate the costs accrued over time.Most technicians will charge a flat hourly fee between $60 and $80, regardless of individual maintenance required. You may have to miss a day of work to let the repairman in. Typical activities include:
  • Cleaning and repairing blocked air vents and flues
  • Checking and maintaining an adequate water level
  • Fixing any small gas, fuel, or water leaks around the unit
  • De-scaling hard water to improve efficiency and reduce attrition
  • Flushing water from the product to clean and maintain its efficiency

Annual Services

Perform all the above maintenances at least once per year. This typically costs between $200 and $350. When possible, schedule an appointment with an HVAC professional after winter to make sure everything about your unit is in working order. Some companies offer yearly contracts that include annual maintenance activities like the above.


The average cost for boiler inspections alone is between about $100 and $200. Even if you choose to tackle maintenance activities on your own, you should hire a professional to get an inspection once each year. During the inspection, the technician will thoroughly check your hot water system to make sure each part is functioning properly.

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How does a Boiler System Work?

A hot-water heating system consists of a heater with water, a network of pipes to distribute the water, and radiators or radiant flooring that heat each room. Controls include a combination gauge that lets you check the internal temperature and pressure and lets you know when the product needs water or is malfunctioning.A pressure-reducing valve takes care of the water automatically in some models. Others have an expansion tank that needs air to charge and prevent the liquid from boiling. Newer systems usually have the expansion tank on the basement ceiling near the unit. They include a purge valve to release water and let in air as needed. Older systems sometimes have the expansion tank in the attic and include a gauge glass like that on a steam boiler.

Who Fixes a Boiler?

Heating systems are so common in most homes. So, you will find an extensive range of companies specifically focused on install, repair, and maintenance. Look for specialized HVAC professionals who have experience and expertise in exactly the type of product that sits in your home.Most states require licenses for professionals and companies looking to work on residential or commercial products. Licensed pros are known as boiler technicians, specifically qualified to work with your unit safely and effectively. They’ve had specialized training, passed a comprehensive exam, and get regular renewals.

Find Licensed Boiler Pros Near You.

DIY or Hire a Pro?

Homeowners can complete some maintenance on their own. For instance, you can buy DIY cleaning kits to clean debris and de-scale your water.Let a pro complete complex fixes or check-ups on your boiler. Even small mistakes can lead to potentially dangerous situations, regardless of whether electricity, gas or oil powers the product. Professional technicians can diagnose the cause of a problem. The repair becomes more effective, while extending the boiler’s life and saving money in the long run. Whenever possible, work with a professional for peace of mind, a reliable fix and your own safety.


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mosella craig More than 1 year ago
Thank you home advisor for giving me the estimated cost for my boiler repair. It gave me an idea of what my out of pocket cost would be. Also, thank you for the common issues section, all of it was useful and very informative.
Delsirene Scott More than 1 year ago
Thanks for such prompt response on the project cost! How much will my project cost? I also need to find a pro who will work on the project asap! Thanks in advance!
richard bell More than 1 year ago
Jacqueline Higgins More than 1 year ago
Thank you for providing this information it was very helpful in letting me know what to expect.

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