Steam Boilers

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Net I=B=R Capacity (BTU) Learn More
Net I=B=R Capacity (BTU)
I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.
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DOE Heating Capacity (BTU) Learn More
DOE Heating Capacity (BTU)
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.
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Maximum Input Capacity (BTU) Learn More
Maximum Input Capacity (BTU)
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
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AFUE (%) Learn More
AFUE (%)
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace.
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Fuel Type Learn More
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
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Product Line
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DHW Production Learn More
DHW Production
DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.
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Product Height (Inches)
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Modulating/Staging Learn More
Modulating/Staging
Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control.
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Ultra Low NOx Emissions Learn More
Ultra Low NOx Emissions
NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx.
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Product Width (Inches)
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Product Depth (Inches)
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Input Rate (GPH)
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 124K BTU DOE Capacity, 93K BTU Net IBR Capacity.
Item#: 150679
Brand: Burnham
$5,146.60
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 200K BTU Gross Input, 165K BTU DOE Capacity, 124K BTU Net IBR Capacity.
Item#: 150681
Brand: Burnham
$5,907.95
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 250K BTU Gross Input, 206K BTU DOE Capacity, 155K BTU Net IBR Capacity.
Item#: 150682
Brand: Burnham
$6,720.90
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 350K BTU Gross Input, 283K BTU DOE Capacity, 212K BTU Net IBR Capacity.
Item#: 163379
Model#: 133044315
Brand: Weil-McLain
$9,225.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 400K BTU Gross Input, 324K BTU DOE Capacity, 243K BTU Net IBR Capacity.
Item#: 163381
Model#: 133044310
Brand: Weil-McLain
$9,225.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
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Free Lift Gate
*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 520K BTU Gross Input, 421K BTU DOE Capacity, 316K BTU Net IBR Capacity.
Item#: 163383
Model#: 133054310
Brand: Weil-McLain
$10,621.00
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 650K BTU Gross Input, 526K BTU DOE Capacity, 395K BTU Net IBR Capacity.
Item#: 163385
Model#: 133064310
Brand: Weil-McLain
$12,673.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 780K BTU Gross Input, 631K BTU DOE Capacity, 473K BTU Net IBR Capacity.
Item#: 163387
Model#: 133074310
Brand: Weil-McLain
$14,249.00
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 910K BTU Gross Input, 737K BTU DOE Capacity, 553K BTU Net IBR Capacity.
Item#: 163389
Model#: 133084310
Brand: Weil-McLain
$16,082.00
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*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges map apply, see our full shipping policy for more details.
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1040K BTU Gross Input, 842K BTU DOE Capacity, 632K BTU Net IBR Capacity.
Item#: 163391
Model#: 133094310
Brand: Weil-McLain
$17,569.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1170K BTU Gross Input, 947K BTU DOE Capacity, 710K BTU Net IBR Capacity.
Item#: 163393
Model#: 133104310
Brand: Weil-McLain
$19,678.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1300K BTU Gross Input, 1053K BTU DOE Capacity, 793K BTU Net IBR Capacity.
Item#: 163395
Model#: 133114310
Brand: Weil-McLain
$21,619.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1430K BTU Gross Input, 1158K BTU DOE Capacity, 880K BTU Net IBR Capacity.
Item#: 163397
Model#: 133124310
Brand: Weil-McLain
$23,193.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1690K BTU Gross Input, 1368K BTU DOE Capacity, 1054K BTU Net IBR Capacity.
Item#: 163399
Model#: 133144310
Brand: Weil-McLain
$26,940.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1950K BTU Gross Input, 1579K BTU DOE Capacity, 1226K BTU Net IBR Capacity.
Item#: 163401
Model#: 133164310
Brand: Weil-McLain
$29,947.00
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Free Lift Gate
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 2210K BTU Gross Input, 1790K BTU DOE Capacity, 1390K BTU Net IBR Capacity.
Item#: 163403
Model#: 133184310
Brand: Weil-McLain
$33,310.00
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Free Lift Gate
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 2470K BTU Gross Input, 2000K BTU DOE Capacity, 1553K BTU Net IBR Capacity.
Item#: 163405
Model#: 133204310
Brand: Weil-McLain
$36,673.00
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*This product qualifies for Free Lift Gate Service. Items over 100lbs normally ship via semi-truck. Select this service if you need the product lowered to the ground curbside. To learn more about Lift Gate Service, read our shipping policy.
Factory-Direct