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How Much Are Gas Boiler Prices?

Typical Range: $2,994 - $8,214

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Gas Boiler Prices

Gas boilers cost $5,597 on average, with a typical range of $2,994 and $8,214. Price depends mostly on efficiency and output as well as brand. You'll pay about $2,000 to $3,000 for a unit with 50,000 to 100,000 BTUs and an AFUE of 82 to 85 percent. Appliances with higher output and efficiency usually cost $3,000 or more.

Boilers provide effective heating with technology that is more than 100 years old. This system uses a heat source, like natural gas, to warm water. Some products allow homeowners to get warmth and hot water from one appliance.

It's important to get the right boiler for your needs. Consider these factors as you make a decision.

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National Average $5,597
Typical Range $2,994 - $8,214
Low End - High End $500 - $12,000

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Cost data is based on actual project costs as reported by 808 HomeAdvisor members in .

High-Efficiency Gas Boiler Prices by AFUE

The $5,200 average for a gas boiler depends on the efficiency of the appliance. Most units have an efficiency measured in AFUE. Standard models are 80 to 85 percent AFUE, and high-efficiency models start at 90 percent AFUE.

Gas Boiler Prices by AFUE

What Is AFUE?

AFUE stands for Annual Fuel Utilization Efficiency, and you'll need to know how it works when you shop for a boiler, furnace or water heater. It's a percentage you get when you compare input to output. For example, if you buy a model with 82 percent AFUE, this means that 82 percent of the energy gets converted into heat.

Energy Star Gas Boilers

In order to earn an Energy Star designation, gas boilers must have an AFUE of 90 percent or higher. This classification lets you know that the product meets U.S. Department of Energy standards for higher efficiency compared to most current options you can buy.

Residential Gas Boiler Prices by Brand

With a typical range of $2,750 to $7,700, the price you'll pay depends partially on the brand. Many companies produce appliances of various types. Here are several top manufacturers of residential gas boilers, along with pricing on popular models.


In business for more than 125 years, Weil-McLain offers an extensive line of gas boilers for residential and commercial use.

Weil-McLain Gas Boiler Prices
CGa-4-PIDN$1,900-$2,70077,00084 percent
383100055$2,000-$3,000144,00095 percent
GV90+4$3,000-$4,00097,00094 percent
EVG 155$3,500-$4,500143,00095 percent


Slant-Fin offers a wide range of residential and commercial boilers. The company designs each model to fit into small spaces.

Slant-Fin Gas Boiler Prices
VHS-90EP$2,30065,00082.8 percent
S-150EDP$2,500110,00084.4 percent
GXHA-160EDP$3,50098,00082 percent

Other Major Brand Prices

Many manufacturers produce boilers for residential use. Other common brands include:

  • Westinghouse: $1,900 to $2,300
  • Triangle Tube: $2,100 to $4,100
  • Utica: $3,000 to $5,000
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Residential Gas Boilers Prices by Size

Boilers cost $1,900 to $8,000, mostly related to output. When you choose a product, you'll start by considering the size you need. Size may refer to the dimensions of the appliance as well as its output, typically measured in BTUs.

Gas Boiler Prices by BTUs

What Are BTUs?

Most residential gas boilers range from 44,000 to 150,000 BTUs in heating output. Boilers measure output in British Thermal Units (BTUs).

You may see units with an output of 400,000 or more BTUs. These are generally designed for commercial or industrial use.

Keep in mind that each appliance lists BTUs for input and output. A unit with 100,000 BTUs input and 95 percent AFUE would have an output of 95,000 BTUs.

How to Choose a Gas Boiler

You can get a rough estimate of the output in BTUs you need based on your climate and the square footage of your house:

  • Cold Climate/Older Home: 50 BTUs per square foot
  • Moderate Climate/Newer House: 35 BTUs per square foot
  • Hot Climate: 20 BTUs per square foot

For example, a 2,500 square foot house in a cold climate need one with an output of at least 125,000 BTUs. Remember that the output you need depends on a lot of factors, like insulation and the age of your home. Talk to a pro to get an accurate estimate for your home's heating load.

Wall Mounted Gas Boilers

Dimensions and location also affect the type of boiler you choose. Many wall mounted options are only about six inches thick. This means that even if you decide to hide it in your hall closet, it's not going to take up much room. Installing it in places like the kitchen or laundry room makes it easier to access for routine maintenance.

Gas Boiler Installation

The cost to install a boiler ranges from $3,500 to $7,800. The total depends on the price of the unit, as well as the labor needed to remove and replace.

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Additional Cost Considerations

On top of the cost of the gas boiler and installation, you may need to add $1,050 to $3,900 to the final price. These depend on your location and the kind of heating system you had previously.

Additional Costs
Oil Tank Removal$500-$1,600


Permit prices typically range from $50 to $300, depending on where you live. Research your local government's rules for utilities to find out how much you'll need to pay.

Removal of Old Oil Tank

The price to remove a fuel storage tank ranges from $500 to $1,600. If you're converting to natural gas from oil, you may need to pay for this service to remove and dispose of the old tank.

Local Gas Steam Boiler Price & Companies

Buying or replacing a boiler is a complicated project that requires a professional. For more information about products available in your area, search for boiler installation services near you.


How long do gas boilers last?

Gas boilers have a life expectancy of 10 to 30 years, depending on type and upkeep. Cast iron models are less efficient but tend to last longer.

How do steam boilers work?

A steam boiler runs heated fuel through water to boil it into vapor. The system directs the steam to a part of the home, like a radiator. As the vapor cools, it turns back into liquid and returns to the appliance.

Is a furnace the same as a boiler?

Furnaces operate similarly to boilers, but they are not the same thing. A furnace heats air to send through ductwork, while a boiler heats water.

Is it cheaper to heat with propane or electric?

While installing an electric boiler costs less than propane, the price you pay for heating depends on your region and the season. Electric units usually have an AFUE of 99 to 100 percent, but bills for the energy may be higher.

Will a natural gas boiler run on propane?

If you want to run a natural gas boiler on propane, you'll need to convert it. This usually requires hiring a boiler repair company near you.

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