How Much Does Boiler Installation and Replacement Cost? [2026 Data]

In 2026, the national average cost for boiler installation is $5,913, based on 1,848 verified projects from Angi Pros. Most homeowners pay between $3,605 and $8,450, with the spread driven primarily by home size, fuel type, and installation complexity. You should also budget for permits costing $150 to $300, plus any gas line, electrical, or asbestos removal work your project may require.

Boiler Installation Cost: By House Size

Your home's square footage and required BTU capacity are the primary drivers of boiler installation cost. The table below breaks down estimated costs by home size and heating capacity:

Costs include materials and labor.

Boiler Replacement Cost: By Fuel Type

Fuel type has a major impact on both the upfront cost of a new boiler and your long-term operating expenses. The most common options are gas, propane, electric, oil, and wood, each with its own installation requirements and maintenance demands. Gas and propane are popular for their availability, while high-efficiency electric models suit smaller homes in warmer climates. Wood-fueled boilers are typically reserved for rural areas with easy access to fuel. Here is how costs break down by fuel type:

• Oil Boiler: Oil burns hotter than gas, so oil boilers are more efficient at heating homes. However, oil boilers require more maintenance than gas options, so keep things like long-term maintenance costs in mind before buying.

• Gas and Propane Boiler: Propane and natural gas are common options for heating homes. In addition to the unit price, installation costs $1,000 to $3,000 and requires new exhaust lines, drains, and fuel lines.

• Electric: Electric boilers are highly efficient and don't require some of the components that gas and oil boilers need, like exhaust vents. They take a long time to heat up but are an attractive option for tiny homes in warm climates.

• Wood: Large, outdoor, wood-fueled boilers are options in rural areas that have easy access to wood.

Boiler Replacement Cost: By System Type

Beyond fuel type, boilers also differ by system type, and that distinction affects both upfront cost and long-term performance. The four main system types are conventional, combination, system, and high-efficiency boilers, each suited to different home sizes and heating needs. High-efficiency models deliver the greatest long-term savings but carry a higher initial price. Here is how costs compare across system types:

Boilers are typically broken out by fuel type, but they can also vary in other ways—like their system types.

• Standard or Conventional Boilers: These boilers work by quickly heating water in pipes and sending it to taps. Standard units are among the most popular choices for homeowners in large homes and for floor heating systems.

• Combination Boilers: Combination boilers are popular because they'll give you access to hot water quickly. However, the supply tends to be limited due to the lack of a storage tank.

• System Boilers: These work by keeping high-pressure hot water in a sealed cylinder, where it can be sent to multiple taps within the home simultaneously.

• High-Efficiency Boilers: High-efficiency boilers are up to 98% efficient, which accounts for thousands of dollars in savings over the boiler's life. Standard boilers are around 80% efficient, ideal for cold climates.

Region and Climate

Your region and climate directly determine how many BTUs your boiler needs to heat your home effectively. Warmer climates require fewer BTUs even for larger houses, while frigid regions demand significantly more heating capacity. You can estimate your necessary BTUs by finding out which climate zone you live in.

Heating Contractor Costs: Hiring Rates

Hiring a heating contractor costs $100 to $250 for the initial assessment, and once work begins, you can expect an hourly rate of $100 to $250 per hour on top of parts and the boiler itself. Labor rates vary based on your location, the complexity of the installation, and the contractor's experience level. Getting multiple quotes before committing helps ensure you're paying a fair rate for your specific project.

Boiler Additional Costs: What to Budget For

Installing a boiler often involves additional costs beyond the unit and basic labor that can meaningfully affect your total budget. Permits, gas line work, ductwork, insulation upgrades, electrical improvements, and asbestos removal are all potential add-ons depending on your home's existing systems and condition. Accounting for these extras before you start helps you avoid surprises and plan your project accurately.

Permits

A permit is required before installing a boiler, and most permits range from $50 to $300, depending on your location and whether the installation is for an existing home or a new build. New builds tend to fall toward the higher end of that range. You may also need a separate inspection, which runs $40 to $75.

Here is a breakdown of typical permit and inspection costs:

Existing Boiler Removal

Removing your old boiler is a necessary part of any replacement project, and it's not a task a homeowner can safely handle alone. Removal costs vary based on boiler type—disconnecting gas lines is more complex than removing an electric unit. Boilers that are 50 years old or older carry additional risk due to potential asbestos, which can significantly increase removal costs.

Ductwork

Installing ductwork costs $3,000 to $7,500 for 300 linear feet, and larger homes may reach up to $15,000 for additional ducts. That said, when it comes to boilers vs. furnaces, boilers typically use water pipes rather than ducts, so most homeowners won't need to budget for new ductwork at all.

Upgrading Insulation

If your home needs new insulation, the cost to install insulation runs around $5,200. You may not need to replace insulation throughout the entire home—targeting key areas like the attic, crawl space, or basement can meaningfully reduce heat loss. Choosing to insulate your attic or other high-loss zones can also reduce how hard your boiler has to work, potentially allowing you to choose a smaller, less expensive unit.

New Gas Lines or Pipes

Installing new gas lines costs between $120 and $1,350, or $550 on average. If you already have gas lines in place, you can avoid this expense entirely. For new installations, expect to spend $15 to $25 per linear foot for labor and materials, with the final cost varying based on the pipe material you choose:

Electrical Upgrades

The cost to upgrade your electrical system depends on what work is needed to support your new boiler. Common electrical upgrades vary in price, so it helps to know what each one typically costs before budgeting your project:

• The cost to rewire a house: $1,500

• The cost to replace a circuit breaker box: $1,150

• Amp service upgrade cost: $1,350

Asbestos Removal

If asbestos is discovered during boiler removal, the cost to remove it averages $2,100, or $1,150 to $3,000 for a localized removal. Whole-home asbestos remediation can run $15,000 to $30,000. According to the Environmental Protection Agency (EPA), asbestos is a dangerous mineral that can cause cancer, so prompt action is essential if it's found in your home.

Thermostat Replacement

The cost to replace a thermostat averages $175, though the final price depends on the type of thermostat you choose for your boiler. Smart thermostats can run up to $300 on average and offer added convenience through remote temperature control and energy usage tracking.

Maintenance

Ongoing maintenance is an important cost to plan for after your boiler is installed, and several routine services help keep your system running efficiently. Here is a breakdown of common boiler maintenance services and their typical costs:

Boiler Cost by Size: How to Estimate Capacity

The price of your new boiler depends on your home's size, so knowing your square footage is the essential first step in calculating what you need. Boiler capacity is measured in BTUs (British Thermal Units), and you can find your required BTU rating by multiplying your home's square footage by the climate factor for your region. The table below shows the climate multipliers by region:

For example, if you live in a 2,000 square foot home in the mid-Atlantic, you'll multiply 2,000 by the higher end of the cold range (in this case, 50) to figure out that you need a boiler with a capacity of 100,000 BTUs.

How Much Does a Boiler Pro Cost?

If a boiler is improperly installed, it can become extremely dangerous. That's why you should always hire a local boiler installer to ensure a safe and efficient installation.

Here's Why It's Ideal to Hire a Boiler Pro

When you're ready for a new boiler, contact a boiler installer for the best results.

• Pros can advise on whether a gas or electric boiler is right for you and on what size boiler to install.

• Pros handle the dangerous aspects of boilers, like the extreme pressure involved, gas lines, and more.

• Boiler pros will ensure their work meets local building codes and guidelines for safe electricity, water line, and gas line installation, along with any necessary permits.

• Boiler pros will manage alterations needed to switch from a very older boiler to a new model, including taking care of new plumbing and indicating where electricians need to upgrade wiring.

• Pros will use professional tools to run boilers through water and temperature tests to make sure everything is functioning properly.

If You Want to DIY a Boiler Installation

You should never try to install a boiler yourself. But you can take care of some of the small related tasks to save time and money.

• Clean up around your boiler and remove all nearby objects to create as much room for the boiler pros as possible.

• Learn the location of your electrical and water shutoffs so you can show them to the installer.

• Empty old radiator and boiler water ahead of the installation.

• Make plans to be without heat for a day or so, depending on your project timeline.

Boiler Remodel Costs vs. Renovation Costs

Before committing to a full replacement, explore whether repairing your existing boiler makes financial sense—the cost of repairing your boiler runs $200 to $600, though some repairs can reach as much as $1,700. Compared to the $5,900 national average for a full replacement, keeping your current unit could be the more cost-effective choice. If your boiler is over 15 years old, replacement is generally the right call. For newer units, multiply the boiler's age by the repair cost—if the result exceeds $5,000, replacing it is the smarter investment.

Boiler Replacement Costs: Ways to Save

The initial costs of a new boiler can be high. These tactics will help you save when picking a new model.

• Compare several boiler installers: They may offer different quotes depending on availability, supply, and other considerations.

• Switch to a more efficient boiler: Boilers are measured by the AFUE (Annual Fuel Utilization Efficiency) rating, which is a percentage-based comparison. The bigger the number, the more efficient the boiler. Increasing your AFUE by 15% or more leads to significant savings over time.

• Stick to the same model: If saving on initial costs is a more important goal, look for the same brand and type of boiler. Switching to a different fuel source or a significantly different system requires new attachments, fuel lines, and more.

• Look for discounts and incentives: Some installers offer discounts for a first-time installation with their company, or a discount if you sign up for a maintenance plan. Also, summer is considered an off-season for boiler installation and may yield more discount options.

• Incentives and rebates: Federal and state governments can both offer rebates, as can local utility companies. Look up your address on the Energy Star website to see available incentives, and ask your installer what rebates are available in your area. A qualifying Energy Star-rated boiler can recoup 30% of the first $600 as a tax credit.

• Make an insulation plan: If your home lacks proper insulation, you may be able to upgrade your insulation and choose a smaller, less expensive boiler than before. It's an additional investment, but well worth it for long-term savings.

Will a New Boiler Increase Home Value?

Installing a new boiler can increase your home's value by about 4% since it'll likely be an attractive selling point for interested buyers. New homeowners will rest easy knowing they won't have to replace their boiler for several years, and that they can rely on heat and hot water in the meantime.

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’ve surveyed thousands of real Angi 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. 

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