Natural Gas Boilers
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 138K BTU Gross Input, 113K BTU DOE Capacity, 85K BTU Net IBR Capacity.
$3,100.00
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Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 172K BTU Maximum Input Capacity, 142K BTU DOE Capacity, 107K BTU Net IBR Capacity.
$3,756.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Taco Circulator and LWCO. Ratings: 138K BTU Gross Input, 116K BTU DOE Capacity, 101K BTU Net IBR Capacity.
$3,278.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 245K BTU Gross Input, 205K BTU DOE Capacity, 178K BTU Net IBR Capacity. Includes Taco Circulator.
$3,709.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 88K BTU DOE Capacity, 77K BTU Net IBR Capacity. Includes Taco Circulator.
$2,440.00
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Wall Mounted, Condensing Boiler with Zero Governor Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 138K BTU DOE Capacity, 120K BTU Net IBR Capacity. Includes Circulator.
$2,165.00
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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.
$2,479.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 550K BTU Gross Input, 517K BTU DOE Capacity, 450K BTU Net IBR Capacity.
$13,971.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 74K BTU DOE Capacity, 64K BTU Net IBR Capacity. Includes Circulator.
$3,927.00
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Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 272K BTU Maximum Input Capacity, 227K BTU DOE Capacity, 197K BTU Net IBR Capacity.
$3,347.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Grundfos Circulator and LWCO. Ratings: 207K BTU Gross Input, 174K BTU DOE Capacity, 151K BTU Net IBR Capacity.
$4,252.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Grundfos Circulator and LWCO. Ratings: 69K BTU Gross Input, 58K BTU DOE Capacity, 50K BTU Net IBR Capacity.
$2,716.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 145K BTU DOE Capacity, 126K BTU Net IBR Capacity.
$4,584.00
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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.
$2,793.79
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 139K BTU DOE Capacity, 121K BTU Net IBR Capacity. Includes Circulator.
$3,974.76
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 199K BTU Gross Input, 184K BTU DOE Capacity, 160K BTU Net IBR Capacity. Includes Circulator.
$4,300.09
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Floor Mounted, Cast Iron Boiler with Step-opening Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 115K BTU DOE Capacity, 86K BTU Net IBR Capacity.
$3,808.28
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Taco Circulator and LWCO. Ratings: 140K BTU Gross Input, 117K BTU DOE Capacity, 102K BTU Net IBR Capacity.
$2,775.60
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 90K BTU Gross Input, 84K BTU DOE Capacity, 73K BTU Net IBR Capacity. Includes Circulator.
$2,800.00
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Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 112K BTU DOE Capacity, 97K BTU Net IBR Capacity. Includes Circulator.
$2,582.00
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Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 111K BTU DOE Capacity, 97K BTU Net IBR Capacity. Includes Circulator.
$2,700.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 112K BTU DOE Capacity, 97K BTU Net IBR Capacity.
$3,389.00
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Floor Mounted, Cast Iron Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 70K BTU Gross Input, 65K BTU DOE Capacity, 56K BTU Net IBR Capacity. Includes Circulator.
$3,888.00
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Floor Mounted, Cast Iron Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 130K BTU DOE Capacity, 113K BTU Net IBR Capacity. Includes Circulator.
$5,012.57
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Displaying Products 25 - 48 (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.