How Much Does a Boiler Replacement Cost in 2024?

Replacing a boiler usually costs between $3,500 and $8,500, depending on many factors.

Replacing a boiler usually costs between $3,500 and $8,500, depending on the brand, size, and type you choose. On average, homeowners should expect to pay around $6,000 for a new boiler installation, including labor and materials.

If you want an energy-efficient oil boiler, you are looking at spending at least $12,500 in total. It’s important to note that adding extra piping or gas line work can increase the overall cost of replacing your boiler. But if you’re just swapping out an old boiler for a standard one, it might only cost you around $1,100.

A low-end boiler might cost less upfront, but you will pay more in the long run. Higher-end boilers with higher energy ratings will offer better value in the long run by reducing your overall energy consumption.

Combi gas boiler
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Average Boiler Replacement Costs

National Average Cost$6,000
Typical Price Range$3,500 – $8,500
Extreme Low-End Cost$1,100
Extreme High-End Cost$12,000

When replacing a boiler, the final bill depends on several factors, such as the type of boiler, labor costs, installation supplies, and materials, as well as the brand and model of the new boiler. Generally, boilers cost anywhere between $3,500 and $8,500 or more to purchase and install.

A new boiler installation costs on average $6,000 nationwide, including the unit itself, materials, and labor. However, large and efficient boilers with a high BTU may cost up to $12,500, while minor projects can cost as little as $1,100 on average. 

Keep in mind that boiler installation is not a job homeowners can do on their own. Hiring a licensed and experienced contractor familiar with boiler installation is essential to ensure the job is done correctly and safely. Additionally, some states require permits to install or replace a boiler, so check your local building codes before beginning the project.

Boiler Replacement Cost Estimator by Home Size

The size of your home also plays an essential role in determining the total cost of your boiler replacement. A larger home with more rooms and multiple stories will need a more powerful boiler to heat the entire house. This will cost more than a small, one-story home with minimal square footage.

For instance, a boiler for a 1,500-square-foot home could cost between $4,500 and $6,800, which would require a 45,000 BTU system. For a 3,000-square-foot home, the boiler needs to be more powerful and could cost between $9,300 and $15,500 for a 90,000 BTU system.

*Note: The BTU rating is the amount of energy it takes to heat 1 pound of water by 1 degree Fahrenheit. The higher the BTU rating, the more powerful and expensive the boiler will be.

Here is a breakdown of the average cost by BTU rating and home size:

Home SizeBTU NeededAverage Overall Cost 
1,000 sq. ft.30,000 – 45,000$3,100 – $6,500
1,500 sq. ft.45,000 – 68,000$4,500 – $6,800
2,000 sq. ft.60,000 – 90,000$6,300 – 10,000
2,500 sq. ft.75,000 – 113,000$5,600 – $8,600
3,000 sq. ft.90,000 – 135,000$9,300 – $15,500

Other Factors That Affect Cost

A boiler replacement is a relatively complex project that involves a variety of different aspects. Some factors that may affect the final cost include the brand and type of unit, additional piping or gas line work, and labor.

Cost of Boiler by Fuel Type 

The cost of a boiler is largely dependent on the type of fuel it uses. Fuel options include oil, gas, and electricity, each with its associated operating and installation costs.

Oil boilers tend to be one of the most expensive options, as they require a large tank to store the fuel and have higher running costs. On the other hand, the electric ones are usually cheaper to install, being suitable for small properties without access to natural gas mains.

Electric Boiler Cost

The average cost of an electric boiler ranges from $1,700 to $8,000. An electric boiler is a good option if you are looking for a boiler with low maintenance and installation costs. It is easy to install, operate, and maintain.

Electric boilers can be costly to run since they require a lot of electricity to function. Moreover, the heat output of electric boilers is not as powerful as other fuel-based boilers. Therefore, these may not be the most suitable choice for larger households.

Gas Boiler Cost

A gas boiler is a popular choice for many homeowners because it is an efficient and cost-effective way to heat the home. Typically, the total price of a gas boiler installation runs between $3,900 and $11,000.

Gas boilers use natural gas to heat water that circulates throughout the home, providing consistent warmth and comfort. These boilers operate much like a furnace, using a pilot flame to ignite the gas and maintain the desired temperature.

Propane Boiler Cost

Propane boilers offer many advantages over other types of boilers, such as energy efficiency and cost savings. Propane is a clean-burning fuel source that is becoming increasingly popular with homeowners looking to save money on their energy bills.

The average cost of a propane boiler installation is around $3,500 and $10,500, depending on the size and power of the unit and local labor costs. Additionally, you may need to purchase separate propane tanks or piping for the system if your home does not already have them.

Oil Boiler

An oil boiler is a great option for those who don’t have access to natural gas or propane. It uses fuel oil that is burned in a combustion chamber to produce hot water or steam.

An oil boiler is typically more expensive than a gas boiler, but the cost can be offset by lower energy costs. On average, an oil boiler’s price ranges from $4,100 to $8,300, depending on the boiler’s size and efficiency.

Outdoor Wood Boiler Cost

A wood boiler is a heating device designed to burn wood fuel in order to generate heat. Wood boilers are typically used as an alternative to traditional gas and oil heaters and provide many of the same benefits, such as energy efficiency, cost savings, and environmental friendliness.

Wood boilers are typically constructed from heavy-duty steel or cast iron and feature an insulated firebox that is designed to keep the heat generated by the fire contained. The average cost of a wood boiler is around $5,800 to $15,000 in total.

Hot Water vs. Steam Water Boiler

The installation cost of a hot water boiler is typically between $1,300 and $4,600, while the installation of a steam boiler is usually more expensive, averaging between $2,800 and $7,500. This price includes the boiler itself, associated labor costs, and installation materials.

Hot Water Boiler$1,300 – $4,600
Steam Water Boiler$2,800 – $7,500

Hot water boilers are used to heat water to a specific temperature and then send it through pipes to different areas of the house. On the other hand, steam boilers are designed to create steam, which is then distributed through radiators and baseboard convectors.

Pros and Cons

Hot Water BoilerSteam Water Boiler
✔ Highly efficient in producing hot water
✔ Utilizes a pump to circulate hot water, improving efficiency

✗ More expensive to run
✗ Maintenance costs for additional parts
✗ Heat transfer is less efficient than other options
✔ High energy efficiency in heat transfer
✔ Suitable for extreme cold climates or older buildings with poor insulation

✗ May require more space for installation due to larger system size

Combi Boiler

A combi boiler, also known as a combination boiler, is an efficient and compact heating solution for small to medium-sized homes. It combines both the central heating and hot water systems in one unit, providing a space-saving option that can heat up your home quickly and efficiently. You can expect to pay between $2,500 to $5,500 for a combi boiler installation.

Combi boilers work by taking cold water from your main supply and heating it up to the temperature required. The boiler will then use a pump to distribute the hot water around your home, allowing you to have hot water whenever you need it.

System Boiler

The cost of a system boiler varies depending on its size and features but typically starts at around $2,100, with larger models costing up to $6,800 in total.

System boilers are a great option for households with multiple bathrooms, as they simultaneously provide central heating and hot water to all taps. They work by storing hot water in a cylinder until it is needed, meaning there is less chance of running out of hot water during busy times.

Standard Boiler

Standard boilers are the most common boiler type and can provide hot water throughout a home via radiators. This type of boiler requires two tanks and typically uses natural gas, oil, or electricity as fuel. On average, standard boilers cost between $2,300 and $7,000, including installation. This type of boiler is ideal for large homes with multiple bathrooms.

Standard boilers are sometimes referred to as “conventional” boilers. If you plan on replacing an old boiler with a standard boiler, you may need to upgrade your radiators and other components to ensure they are compatible with the new system.

High-Efficiency Boiler

High-efficiency boilers have advanced features such as a modulating burner, precise control systems, and condensing technology which helps to recycle heat. The cost of installing a high-efficiency boiler e is typically between $3,500 and $12,000 in total.

High-efficiency boilers are designed to save energy, generate lower emissions and reduce operating costs. High-efficiency boilers are available in both gas-fired and oil-fired models, with efficiency ratings of up to 95%.

Condensing Boiler vs. Non-condensing Boiler Cost

On average, a condensing boiler will cost around $2,500 to $7,000, while a non-condensing boiler will cost $1,200 to $5,000 in total.

Condensing boilers are more efficient and tend to be pricier upfront. They also require bigger flues, more ventilation, and a higher capacity pump to handle the increased flow of hot water. But the extra upfront costs can be worth it in the long run.

Condensing boilers can save you money on fuel bills and reduce carbon emissions due to their higher efficiency rating of up to 95%. In comparison, standard non-condensing boilers usually range from 80% to 88% efficiency. Over the lifetime of a boiler, condensing models are often more cost-effective than non-condensing.

*Note: The AFUE (Annual Fuel Utilization Efficiency) rating is a measure of boiler efficiency expressed as a percentage, indicating the ratio of energy supplied to the amount actually used. The higher the rating, the more efficient the boiler.

New Boiler Cost by Brand

The brand of boiler you choose for your replacement project can significantly affect the total cost. For example, Lennox boilers have higher efficiency ratings and more extended warranties, but they tend to be pricier than other brands. Lennox boiler costs range from around $1,700 to $6,500, and that includes only the unit.

Navien is another reliable brand with a range of options and warranties. A Navien boiler typically costs between $1,800 and $4,600, without labor costs for installation.

The cost of a boiler is affected by features, size, and efficiency. Below is a list of average prices for some popular boiler brands:

BrandAverage Cost
Navien$1,800 – $4,600
Burnham$1,500 – $5,500
Crown$1,600 – $4,700
Lennox$1,700 – $6,500
Utica$1,400 – $6,500
Peerless$1,600 – $6,000

Labor Cost

Replacing an old boiler is a significant undertaking and requires the expertise of professionals to ensure that the job is done correctly. This project includes labor costs for removing the existing boiler and installing the new one, along with any associated piping and wiring.

Old Boiler Removal and Disposal Cost

Getting rid of an outdated boiler can be quite a job, mainly if it is in a hard-to-reach spot or is large and heavy. It needs specific tools and knowledge to take away the boiler and dispose of it in an environmentally friendly way.

The cost of removing and disposing of an old boiler typically ranges from $150 to $400. The exact amount may depend on how difficult it is to take out the old boiler and the transport distance.

New Boiler Installation Cost 

Plumbers typically charge an hourly rate between $70 and $150 for labor when installing a new boiler, with the entire project likely to cost between $1,750 and $3,200. This cost may vary depending on the complexity of the project and any extra services required.

When installing a new boiler, there are several related services to consider. These could be necessary or optional, depending on your situation. For instance, HVAC professionals may offer a maintenance and tune-up plan for the boiler. Additionally, they may install additional features such as a thermostat or a generator.

Boiler Maintenance Cost

Regular boiler maintenance ensures your boiler operates efficiently and safely. Boiler maintenance will typically cost between $75 and $125 per hour and may include inspecting the boiler, cleaning it, and making minor repairs.

The cost of an annual boiler service ranges from $190 to $480, depending on the boiler’s size, age, condition, and whether any parts need replacing.

Regular HVAC system maintenance can help reduce unexpected breakdowns and costly repairs. The average cost for an HVAC maintenance visit ranges from $85 to $170.

Boiler Repair Cost

Boiler repair could cost anywhere from $200 to $800, depending on how complicated the repair is. Repairs could include replacing a part, cleaning the boiler, or more extensive repairs like replacing the heat exchanger or burner.

It’s essential to have a professional check your HVAC system regularly so they can find and fix any issues before they become significant problems. In some cases, replacing the unit may be more cost-effective than repairing it, especially if the repairs are extensive. On average, HVAC system repair costs can range from $180 to $580 for basic repairs.

Wall-mounted Boiler

The national average cost of installing a wall-mounted boiler is between $3,000 and $5,000, including the unit itself, materials, and labor. Wall-mounted boilers are an excellent option for homes that don’t have enough space for a floor-mounted boiler, and they can be safely installed on an interior wall. 

When installing a wall-mounted boiler, consider the size of the room and ensure there is enough space for proper ventilation and access to the controls.


A thermostat can be a great way to control the temperature in your home. Plus, some modern thermostats can even control multiple zones and can help you save energy by automatically adjusting the temperature when you’re away or asleep. Generally, a thermostat could cost anywhere from $120 to $330, including materials and labor.


Installing a generator is a smart way to ensure that you always have a reliable power source in case of an outage. Installing a generator is also a wise investment, as it has the potential to increase your property value and make your home more attractive.

Generators are available in various sizes and price points, so you can find one to meet your specific needs. On average, a generator costs between $6,000 and $20,000, including installation. A professional HVAC technician can help you determine the best type of generator for your home and budget.

Boiler Cost vs. Furnace Cost

When choosing the right type of heating system, it’s important to understand the differences between boilers and furnaces. Both types of HVAC units can provide reliable and efficient heating.

Boilers are water-based systems that heat the air in a home using hot water or steam and require additional components such as radiators, convector units, or in-floor radiant systems. Boilers are usually more expensive to install but offer even and consistent heating with precise temperature control. Generally, boiler installation costs between $3,500 and $8,500.

Furnaces are air-based systems that use a combustion process to heat air and distribute it through ductwork. Furnaces are more affordable and quicker to install but can be noisy and have temperature fluctuations. Furnace installation costs between $2,000 and $4,500 in total. 

New Boiler Cost vs. Boiler Replacement Cost

The cost of replacing an old boiler or installing a new one can be similar, usually ranging from $3,500 to $8,500. This estimate includes the unit itself, labor costs, and any additional materials or parts needed. The specific price depends on the type of boiler you choose and its size, complexity, and energy efficiency. 

There may be factors related to the installation process that can affect the final cost, whether installing a new boiler or replacing an old one. For example, when replacing an old boiler, you may need to replace or repair existing pipes, replace the oil tank, or install new gas pipes.

You may also need to consider the cost of a new thermostat and other controls, as well as any additional labor costs associated with the installation.

In the table below, you’ll find a breakdown of the potential costs associated with new boiler installation or replacement:

TaskAverage Cost
Old Boiler Removal$150 – $400
New Boiler Unit$1,750 – $5,300
Installation Labor $1,750 – 3,200
Install Condensation Drain$260 – $650
Permits$50 – $300
Propane Tank Installation (only if necessary)$1,200 – $3,400
Oil Tank Replacement (only if necessary)$800 – $4,500
Oil Contamination Soil Test (only if necessary)$550 – $1,300
Hot-Water Heater/Storage Tank with Installation (only if necessary)$1,300 – $4,500
Cost to Fix Leaking Pipes (only if necessary)$150 – $600
Water heater storage tank repair (only if necessary)$200 – $800
Thermostat Cost (only if necessary)$120 – $330
Gas Line Hookup$450 – $2,400
Gas-Fired Equipment$5,000 – $6,000
Gas Line Installation$600 – $1,500
Chimney Liner$2,000 – $6,000
New Natural Gas to Propane Conversion Kit$120 – $400
Installing New Plumbing Pipes $500 – $2,000
Home Radiators $150 – $1,500/unit

Boiler Replacement Cost by Location

The national average cost to replace a boiler is between $3,500 and $8,500, but the price can vary greatly depending on where you live. Labor rates and material costs are higher in some states than others, and factors like local taxes, regulations, and labor costs can all affect the overall cost of a project.

For instance, a boiler installation in New York City may cost more than double what it would cost in rural areas. Before hiring an HVAC professional, get quotes from several local companies so you can compare prices and get the best deal.

FAQ About Boiler Replacement

Can I replace a boiler myself?

No, you should not attempt to replace a boiler yourself. Installing or replacing a boiler requires specialized technical knowledge and experience. It is best to hire a professional HVAC technician who can ensure the job is done safely and correctly.

What type of boiler is best for my home?

When selecting the right boiler for your home, there are several factors to consider, such as size and efficiency. Boiler size is mainly determined by the size of your home and how many hot water outlets you require. An HVAC contractor can help you choose the most suitable boiler size for your home.

Additionally, a Manual J load calculation should be done to determine the size of the boiler needed for your home, considering climate, insulation levels, construction materials, and window/door size and orientation. On average, a Manual J calculation costs between $300 and $700. 

How often should you replace a boiler?

In general, boilers will last up to 15 years with proper maintenance. Keep in mind that boilers older than 10 years may not be as energy efficient and require more repairs. 

Are old boilers dangerous?

Yes, old boilers can be dangerous. Older models are more likely to be weakened from corrosion, develop leaky valves, and have other problems that may cause a fire or other damage. It’s essential to have an HVAC technician inspect your boiler regularly to ensure it is safe and energy efficient. 

Boiler Costs and Where to Find an HVAC Pro

The cost of installing a new boiler or replacing an old one can range from $3,500 and $8,500 in total. The type of boiler you choose and its size, complexity, and energy efficiency can all affect the final cost. Additionally, labor rates and material costs vary by state, so get quotes from contractors in your area to find the best price. HVAC Gnome connects you to the best HVAC professionals near you.

Note: HVAC Gnome may get a referral fee for matching you with contractors in your area.

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Luminita Toma

Luminita Toma is a nature-loving writer who simply adores anything pretty, from colorful flower gardens to chic interior design. After plenty of research on landscaping and home improvement, she’s got a keen eye for what makes a home beautiful. When she’s not sharing what she’s learned, there’s nothing she enjoys more than chilling with her friends, hitting the theatre, or traveling.