How Much Does Boiler Replacement Cost in Baltimore? [2025 Data]

Boiler replacement costs in Baltimore average $5,473, and most homeowners pay between $3,131 and $7,914. Your price will depend mostly on the size of your home, which dictates the boiler size you need, as well as the fuel type you plan on using. Most homes in the city use natural gas for heat, but electric boilers are also somewhat popular and cost up to 50% less.

Boiler Replacement Cost Factors

Some homeowners in Baltimore, MD, pay as little as $400 to replace their boilers, but prices can climb as high as $11,000. You should consider all of the cost factors below to get an accurate estimate for your boiler replacement costs.

Size

Boiler size or capacity—measured in British Thermal Units (BTUs)—is the most important cost factor to consider when it’s time to replace your boiler. You should have an HVAC tech size your boiler for you, but a good rule of thumb in Baltimore’s relatively moderate climate is to aim for 45 BTUs per square foot of living space. The average home in Baltimore is 1,450 square feet, which means the average boiler needs to be 65,000 BTUs.

You can estimate the cost of your boiler by your home’s square footage and boiler capacity using the table below. However, call an HVAC pro in Baltimore, MD, for the most accurate estimate.

Fuel Type

The most common fuel used for boilers in Baltimore, MD, is natural gas, but electric boilers are also quite popular. The fuel type you choose will have a major impact on both your ongoing costs and how much you pay for a new boiler.

• Oil boiler: Oil burns hotter than gas, so oil boilers provide more heat and are better in colder climates. 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, and a little over 60% of all homes in Baltimore use natural gas for heating. 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 in moderate climates like the one in Baltimore, they can be sufficient and can cost up to 50% less than gas boilers.

• Wood: Large, outdoor, wood-fueled boilers are good options for rural areas that have easy access to wood. These are virtually non-existent in Baltimore.

System Type

Boilers are 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 your taps. Standard units are one of the most popular choices for homeowners in large homes and those with 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 your 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, making them ideal for cold climates.

Climate Zone

The capacity of your boiler (in BTUs) depends on your region and climate. Warmer climates make it much easier to heat water, even for larger houses, so fewer BTUs are required. You can estimate your necessary BTUs by finding out which climate zone you live in. Baltimore is located in climate zone 4, which means most homes will need an average of 45 BTUs per square foot of living space. Make sure to have a pro size your system, though.

HVAC Pro Costs

Hiring an HVAC professional in Baltimore to handle your boiler replacement will mean paying an average of $2,700 in labor costs, which means labor alone accounts for 50% of your total. Labor costs are higher in Baltimore than they are in most other cities, in large part because the cost of living in the city is close to 13% higher than the national average.

Labor for boiler replacement is expensive, but the city only allows certified professionals to handle the work, so there’s no legal way around hiring a pro. Even if there was, it would still be wise to hire an expert since they ensure your boiler is sized appropriately and installed properly to avoid problems and potentially deadly venting issues.

The City of Baltimore charges permit fees for boiler replacement, which you should factor into your total. The cost is based on the BTU rating of the boiler you’re installing, and for most residential systems, the total permit fee will be $30. If you need a new gas line installed for a gas boiler, you’ll need another permit for that work, which will add $25 to your permit costs.

Does Boiler Replacement Increase Home Value?

Yes, replacing your boiler will increase your home value because a new heating system will give buyers more confidence that they’re buying a home that won’t leave them with unexpected repair and replacement costs after closing. On average, you can expect a new boiler to provide a return on investment (ROI) of 60% to 80%, which means an average value bump of between $3,300 and $4,400 in Baltimore.

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 survey 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. 

Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.