Chimney Vent Natural Gas Hot Water 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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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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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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Energy Star Listed
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 67k BTU Gross Input, 56k BTU DOE Capacity, 49k BTU Net IBR Capacity. Includes Circulator.
Item#: 109091
Model#: 381359100
Brand: Weil-McLain
$2,552.93
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 67k BTU Gross Input, 56k BTU DOE Capacity, 49k BTU Net IBR Capacity. Includes Circulator.
Item#: 109092
Model#: 381359101
Brand: Weil-McLain
$2,552.93
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 100k BTU Gross Input, 85k BTU DOE Capacity, 74k BTU Net IBR Capacity. Includes Circulator.
Item#: 109093
Model#: 381359103
Brand: Weil-McLain
$2,793.79
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 133k BTU Gross Input, 113k BTU DOE Capacity, 98k BTU Net IBR Capacity. Includes Circulator.
Item#: 109094
Model#: 381359104
Brand: Weil-McLain
$3,144.60
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 133k BTU Gross Input, 113k BTU DOE Capacity, 98k BTU Net IBR Capacity. Includes Circulator.
Item#: 109095
Model#: 381359105
Brand: Weil-McLain
$3,144.60
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 166k BTU Gross Input, 141k BTU DOE Capacity, 123k BTU Net IBR Capacity. Includes Circulator.
Item#: 109096
Model#: 381359106
Brand: Weil-McLain
$3,616.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 166k BTU Gross Input, 141k BTU DOE Capacity, 123k BTU Net IBR Capacity. Includes Circulator.
Item#: 109097
Model#: 381359107
Brand: Weil-McLain
$3,615.09
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 200k BTU Gross Input, 170k BTU DOE Capacity, 148k BTU Net IBR Capacity. Includes Circulator.
Item#: 109098
Model#: 381359108
Brand: Weil-McLain
$4,019.01
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 200k BTU Gross Input, 170k BTU DOE Capacity, 148k BTU Net IBR Capacity. Includes Circulator.
Item#: 109099
Model#: 381359109
Brand: Weil-McLain
$4,019.01
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 233k BTU Gross Input, 198k BTU DOE Capacity, 172k BTU Net IBR Capacity. Includes Circulator.
Item#: 109212
Model#: 113081460
Brand: Weil-McLain
$4,367.69
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Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 170K BTU Maximum Input Capacity, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity.
Item#: 111066
Brand: ProSelect Force Boilers
$2,529.00
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Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 238K BTU Maximum Input Capacity, 199K BTU DOE Capacity, 173K BTU Net IBR Capacity.
Item#: 111069
Brand: ProSelect Force Boilers
$3,075.00
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Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 204K BTU Maximum Input Capacity, 170K BTU DOE Capacity, 148K BTU Net IBR Capacity.
Item#: 111070
Brand: ProSelect Force Boilers
$2,734.00
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In-Stock
Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 38K BTU Maximum Input Capacity, 32K BTU DOE Capacity, 28K BTU Net IBR Capacity.
Item#: 111076
Brand: ProSelect Force Boilers
$1,783.00
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In-Stock
Floor Mounted, Cast Iron Boiler with Gas Valve. Ships Packaged. Ratings: 70K BTU Gross Input, 59K BTU DOE Capacity, 51K BTU Net IBR Capacity. Includes Circulator.
Item#: 150646
Model#: 303BNI-G
Brand: Burnham
$2,941.00
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Floor Mounted, Cast Iron Boiler with Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 88K BTU DOE Capacity, 77K BTU Net IBR Capacity. Includes Circulator.
Item#: 150647
Model#: 304BNI-G
Brand: Burnham
$3,207.00
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In-Stock
Floor Mounted, Cast Iron Boiler with Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 117K BTU DOE Capacity, 102K BTU Net IBR Capacity. Includes Circulator.
Item#: 150648
Model#: 305BNI-G
Brand: Burnham
$3,592.00
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In-Stock
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 350K BTU Gross Input, 294K BTU DOE Capacity, 256K BTU Net IBR Capacity.
Item#: 163380
Model#: 133041315
Brand: Weil-McLain
$8,541.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 400K BTU Gross Input, 336K BTU DOE Capacity, 292K BTU Net IBR Capacity.
Item#: 163382
Model#: 133041310
Brand: Weil-McLain
$8,541.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 520K BTU Gross Input, 436K BTU DOE Capacity, 379K BTU Net IBR Capacity.
Item#: 163384
Model#: 133051310
Brand: Weil-McLain
$9,936.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 650K BTU Gross Input, 546K BTU DOE Capacity, 475K BTU Net IBR Capacity.
Item#: 163386
Model#: 133061310
Brand: Weil-McLain
$12,010.00
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Factory-Direct
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 780K BTU Gross Input, 655K BTU DOE Capacity, 570K BTU Net IBR Capacity.
Item#: 163388
Model#: 133071310
Brand: Weil-McLain
$13,586.00
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Factory-Direct
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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Factory-Direct
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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Factory-Direct