How Much Does Boiler Service Cost in 2025?
Boiler service costs an average of $425
Average boiler service costs range from $190 to $659, with most homeowners spending an average of $425.
Your final bill depends on the boiler type, the specific problem, labor, and parts, so build these variables into your budget up front.
Professional boiler service keeps your heating system running safely and efficiently by covering repairs, cleaning, and routine checks.
Scheduling timely professional service helps you avoid major breakdowns, preserve efficiency, and extend your boiler’s life, saving you money over time.
This article was updated using automation technology and thoroughly reviewed for accuracy by HomeAdvisor Editor Ryan Noonan.
Boiler service is still a smart investment in keeping your heating system running efficiently. On average, you’ll spend $425 on boiler service costs, with most repairs averaging between $190 and $659. The exact price depends on your system’s type, size, location, quality, and how often you schedule service, so plan ahead and work with a qualified pro.
Boiler Repair Cost Factors
Budget for your boiler service costs by understanding the factors that impact the total cost of repairs and maintenance.
Boiler Type and Size
What you pay largely comes down to your boiler’s fuel source—gas, oil, or electric. The size of your boiler is also part of the equation, with larger homes requiring boilers with more British thermal units (BTUs) than those suited for smaller homes.
Labor
Pros charge a flat $150 to $300 for labor, or $75 to $130 per hour. Expect higher rates for emergency, after-hours, weekend, or holiday calls. Ask about annual service contracts; they often lower per-visit costs compared with one-time calls. Talk to your local boiler repair pro for a detailed quote based on your boiler.
Repair Problem
Repair prices hinge on the exact problem, needed parts, and time on site. Below are common issues a pro can tackle.
| Repair Problem | Average Materials Cost | Average Labor Cost |
|---|---|---|
| Faulty ignitor switch | $25–$150 | $100–$200 |
| Faulty expansion tank | $40–$130 | $100–$250 |
| Faulty circulator, ductwork, radiators | $150–$350 | $250–$500 |
| Faulty pipes or valves | $150–$400 | $200–$600 |
Boiler Repair Costs by Fuel Source
Boiler repair costs vary depending on the fuel source that powers your unit. Here are the repair costs associated with each type of boiler.
| Fuel Source | Average Repair Cost |
|---|---|
| Gas | $100–$400 |
| Electric | $200–$450 |
| Oil | $200–$500 |
Gas
Gas boiler repairs run $100 to $400. Because gas boilers are common, parts are easy to find and fairly affordable. If yours is more than 10 years old and needs frequent fixes, replacement could be the smarter move.
Common gas boiler problems include:
Damaged transformers or igniters
Damaged water circulation pump
Expansion tank issues
Issues with temperature, pressure, or gas regulator valves
Broken fuel lines
Malfunctioning heat exchanger
Loose wiring connections
Air in the system pipes
Electric
Electric boiler repairs cost $200 to $450. As these systems gain popularity, parts and qualified technicians have become easier to find, driving repair prices down compared with years past.
Common electric boiler problems include:
No hot water
Low pressure
Inefficient circulating pump
Electrical wiring issues
Heat exchanger issues
Malfunctioning thermostat
Trapped air or clogs in radiators
Water leaks
Oil
Oil boiler repairs average $200 to $500. While less common today, you’ll still see them in older New England homes and other rural areas, and pros can source parts without much trouble.
Oil boilers are more energy-efficient than most boiler types, but oil boiler repair costs tend to be higher on average. If your technician recommends replacement, budget $4,800 to $9,000 in boiler installation costs.
Common oil boiler problems include:
Malfunctioning oil burners and transformers
Heat exchanger cracks
Clogged heating oil pump
Clogged burner nozzles
Corroded or clogged fuel pipes
Loose wiring connections
Damaged valves
Air in the fuel line
Issues with the chimney flue
Boiler Replacement Costs by Part
Boiler replacement costs range from $10 to $800 for each part alone. Labor adds another $150 to $300. A technician will need to replace a few parts for most boiler repairs. A new part will save on costs in each case below and is safer than working with the existing, damaged, or worn‐down part.
When multiple components break down, repairing or replacing individual parts becomes less affordable. If that’s the case, it might be time to consider a new unit.
| Replacement Part | Average Cost (All-In) |
|---|---|
| Zone valve | $200–$500 |
| Expansion tank (gas) | $200–$550 |
| Expansion tank (oil) | $250–$530 |
| Expansion tank (electric) | $200–$550 |
| Coil | $500–$1,000 |
| Circulating pump | $300–$1,000 |
| Gas valve | $300–$1,100 |
| Radiator Valve | $180–$330 |
| Fan | $200–$500 |
| Transformer | $180–$500 |
| Flue | $300–$700 |
Zone Valve
A zone valve is an integral part of the boiler system, controlling how much water or steam flows into each room of the house. A zone valve replacement, including labor, costs $200 to $500.
Expansion Tank
The expansion tank provides cushioning for expanding water when heated. Prices vary by the boiler type, but a boiler expansion tank replacement costs $200 to $550, installed. The size of the boiler can also ultimately determine the cost.
Coil
Replacing a boiler coil, which transfers heat from the burner to the water, costs between $500 and $1,000, including labor. If hard water minerals have clogged the coil, the technician might also need to replace piping connections, valves, and gaskets, which can add to the cost.
Circulating Pump
A circulating pump (also called a circulator pump) can be an expensive repair, costing an average of $300 to $1,000, including labor. This part pumps heated water through the house. Brand, size, and speed all affect the overall cost. Replacing a faulty circulating pump is crucial because if it isn’t working, your boiler will be creating hot water or steam for no reason.
Gas Valve
The gas valve controls the flow of gas to the burner. A gas valve replacement costs upwards of $1,100, including labor, and depending on the project. The work involves shutting off natural gas to remove and reconnect lines, so a pro must handle this process for safety reasons.
Radiator Valve
A radiator valve is an essential part that controls how much hot water enters each radiator. You can buy one for $10 to $60 at a hardware store. However, a technician’s diagnosis and installation of the replacement valve will cost approximately $180 to $330.
Fan
The fan pushes combustion fumes outside through the flue. A technician will charge $200 to $500 to install a new boiler fan. Brand and size are the two largest factors affecting the cost.
Transformer
The transformer supplies power to the boiler. If you need to replace the transformer for your boiler, expect to pay $180 to $500. Additional work, like rewiring or installing a new thermostat, can add to the cost.
Flue
The flue carries combustion fumes outside of the home. Replacing the flue can vary in price, from $300 to $700. The boiler type will affect the overall replacement cost:
Oil boilers must connect to chimneys since they need stainless steel vents.
Gas boilers give you more options for venting, including metal ducts and even PVC pipes.
Electric boilers don’t produce fumes, so you won’t need to install vents. This is one key way that electric boilers make boiler repair costs more affordable.
Additional Boiler Services
Your boiler service pro can tackle some other common tasks in addition to fixing your unit’s main components and performing routine maintenance.
Gas and Oil Boiler Cleaning
Gas and oil boiler cleaning costs $150 to $350 as part of an overall service. Regular cleaning is crucial; neglecting it can turn your boiler into an unreliable and potentially dangerous appliance.
Flushing
Flushing removes sediment and minerals that build up in the boiler and the lines, which can harm the tank and cause overheating and corrosion. Boiler flushing costs anywhere from $200 to $600, depending on the boiler size and the length of pipes running through your home.
Without regular cleaning, your boiler can become unreliable and even dangerous, leading to costly repairs or replacements. Annual service contracts often include flushing as an option.
Budgeting for Boiler Service
Consider these cost-saving strategies to make your boiler servicing more wallet-friendly:
Ask your boiler service pro if they offer an annual maintenance contract, which often offers a discounted price per visit.
Stay on top of regular maintenance to identify issues promptly and avoid escalating problems and costs in the future.
Get quotes from three local boiler repair pros to ensure competitive pricing.
DIY vs. Hiring a Boiler Repair Pro
Hire a professional for repairs, routine maintenance, and inspections. Without specialized training, you can miss small issues that turn into costly problems, and even minor mistakes can create safety hazards, no matter the fuel source.
A local boiler pro keeps the work safe and helps your system last longer. Schedule an appointment with a top-rated boiler repair pro to keep your system safe and efficient.
How HomeAdvisor Gets Its Cost Data
No place is more important than your home, which is why HomeAdvisor connects homeowners with local pros to transform their houses into homes they love. To help homeowners prepare for their next project, HomeAdvisor provides readers with accurate cost data and follows strict editorial guidelines. We surveyed thousands of real customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from 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.
Frequently Asked Questions
A boiler that suddenly provides less heat or hot water, shows an orange or yellow flame, makes banging or whistling sounds, or posts erratic pressure readings is signaling trouble. These early warnings help you avoid a full breakdown and keep your home safe. If you spot any of them, shut the unit off and call a qualified pro for an inspection.
Common boiler issues include malfunctioning oil burners, failed transformers, cracks in the heat exchanger, clogged pumps or fuel lines, loose wiring, and damaged valves. Low fuel or gas supply can also stop the system. Catching these problems during routine service keeps the unit safe and efficient and prevents more expensive repairs later.
Start by noting your unit’s age and take note of the scope of the issues. Boilers last 15 to 20 years, so if yours is 15 years or older and needs frequent, costly repairs—or the warranty has lapsed—replacing your boiler often makes more financial sense and improves safety and efficiency.
Skipping routine maintenance raises the risk of carbon monoxide leaks, sudden shutdowns, and expensive repairs, or even a full replacement that can top $6,000. Regular service keeps small problems from snowballing, protects your family’s safety, and extends the system’s life. Check carbon monoxide detectors often and schedule annual boiler tune-ups.
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