Natural Gas Boilers
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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.
$3,207.00
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 144K BTU DOE Capacity, 108K BTU Net IBR Capacity.
$4,457.00
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 210K BTU Gross Input, 173K BTU DOE Capacity, 130K BTU Net IBR Capacity.
$4,975.00
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 245K BTU Gross Input, 202K BTU DOE Capacity, 152K BTU Net IBR Capacity.
$5,530.00
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 125K BTU Gross Input, 103K BTU DOE Capacity, 77K BTU Net IBR Capacity.
$4,993.00
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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.
$5,190.00
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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.
$6,289.00
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Floor Mounted, Cast Iron Boiler with Conversion Included. Ships Packaged. Ratings: 140K BTU Gross Input, 120K BTU DOE Capacity, 104K BTU Net IBR Capacity. Includes Circulator.
$4,105.00
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Floor Mounted, Cast Iron Boiler with Conversion Included. Ships Packaged. Ratings: 105K BTU Gross Input, 90K BTU DOE Capacity, 78K BTU Net IBR Capacity. Includes Circulator.
$3,529.00
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INSFS110S - Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 102K BTU DOE Capacity, 89K BTU Net IBR Capacity.
$4,057.00
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INSFS155S - Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity.
$4,269.00
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INSFS199S - Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 199K BTU Gross Input, 184K BTU DOE Capacity, 159K BTU Net IBR Capacity.
$4,652.00
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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.
$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.
$19,149.00
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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.
$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.
$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.
$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.
$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.
$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.
$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.
$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.
$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.
$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.
$32,692.00
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Displaying Products 145 - 168 (of 294)
Tools & Articles
About Natural Gas Boilers
Shop a wide assortment of natural gas boilers from top brands like ProSelect, Weil-McClain, and Noritz.
Shop by Medium:
Choose between hot water and steam boilers. When replacing an old boiler, you need to identify whether it used hot water or steam to find the right replacement. Steam-fired boilers will have a small glass tube, called a sight glass, mounted on the side of the boiler. Hot water boilers will not have a sight glass but are likely to have other accessories installed nearby, such as a pump or expansion tank.
Shop by Vent Type:
We offer boilers with one of three different venting configurations.
- Chimney-vented boilers eject spent combustion gases through a vertical stack or chimney.
- Power-vented boilers use a built-in blower to push spent gases outside. They offer the flexibility to vent through a sidewall or the ceiling without needing to use a chimney.
- Direct vent boilers pull air for combustion directly from outside the house. This means the entire combustion process is “sealed” from the indoors, and you are not exhausting the air you had already heated. They are particularly great for tight places, like closets or rooms without much air flow.
Shop by Efficiency:
Home boilers are typically available in efficiency ratings ranging from 80% - 96% Annual Fuel Utilization Efficiency (AFUE). A boiler's AFUE rating estimates the percentage of fuel that is converted into usable heat for the home. By comparing AFUE ratings, you can get an idea of how much a boiler may cost to operate. Condensing boilers are the most efficient because they use a secondary heat exchanger to collect heat from exhaust gases and repurpose it to preheat incoming water.
Staging/Modulation
Boilers can also save energy through staging or modulation.
- Staging boilers have two or more distinct levels of heat output called stages. The boiler will operate at the lowest stage that meets your home’s heating needs.
- Modulating boilers can produce any heat output between a defined minimum and maximum level for constant, even heat.
What are Combi Boilers?
A combination (combi) boiler combines a boiler and tankless domestic water heater into one, compact unit. There is no hot water tank. Instead, the boiler circulates hot water through a heat exchanger, which in turn heats incoming cold water on demand. The heated domestic water then flows to fixtures throughout the home.