Natural Gas Boilers

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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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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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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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Vent Type Learn More
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
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Medium Learn More
Medium
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.
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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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Efficiency (%)
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Low NOx Emissions Learn More
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. Low NOx appliances emit less than 40 ng/J (nanogram per Joule) of NOx.
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 910K BTU Gross Input, 764K BTU DOE Capacity, 664K BTU Net IBR Capacity.
Item#: 163390
Model#: 133081310
Brand: Weil-McLain
$15,418.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1040K BTU Gross Input, 873K BTU DOE Capacity, 759K BTU Net IBR Capacity.
Item#: 163392
Model#: 133091310
Brand: Weil-McLain
$16,906.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1170K BTU Gross Input, 982K BTU DOE Capacity, 854K BTU Net IBR Capacity.
Item#: 163394
Model#: 133101310
Brand: Weil-McLain
$19,149.00
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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.
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1300K BTU Gross Input, 1092K BTU DOE Capacity, 950K BTU Net IBR Capacity.
Item#: 163396
Model#: 133111310
Brand: Weil-McLain
$20,979.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1430K BTU Gross Input, 1201K BTU DOE Capacity, 1044K BTU Net IBR Capacity.
Item#: 163398
Model#: 133121310
Brand: Weil-McLain
$22,552.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1690K BTU Gross Input, 1419K BTU DOE Capacity, 1234K BTU Net IBR Capacity.
Item#: 163400
Model#: 133141310
Brand: Weil-McLain
$26,323.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 1950K BTU Gross Input, 1638K BTU DOE Capacity, 1424K BTU Net IBR Capacity.
Item#: 163402
Model#: 133161310
Brand: Weil-McLain
$29,330.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 2210K BTU Gross Input, 1856K BTU DOE Capacity, 1614K BTU Net IBR Capacity.
Item#: 163404
Model#: 133181310
Brand: Weil-McLain
$32,692.00
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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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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 2470K BTU Gross Input, 2074K BTU DOE Capacity, 1803K BTU Net IBR Capacity.
Item#: 163406
Model#: 133201310
Brand: Weil-McLain
$36,055.00
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Sale: $1,785.00
On Sale Through 06/24
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