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Natural Gas Boilers

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Natural gas boilers come in both hot water and steam mediums, and have a variety of different venting options to fit your needs. Shop our selection of natural gas boilers from the top manufacturers and find one for your home.
Burnham - 30% Off Select Boilers
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Model Number CB180DV-NG is the Number 1 Seller
Learn More About CB180DV-NG
Noritz CB180 - 100k BTU - 95.1% AFUE - Combi Gas Boiler - Direct Vent
Model: CB180DV-NG
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 100K BTU Gross Input, 92K BTU DOE Capacity, 80K BTU Net IBR Capacity. Includes Circulator.
12% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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$1,765.00
Was 
$2,065.00
SAVE $300.00
Only 4 In-Stock
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Model Number 381357806 is the Number 2 Seller
Learn More About 381357806
Model 381357806 is a Recommended Product
Weil-McLain CGa-5-PIDN - 117K BTU - 83.5% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357806
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 117K BTU DOE Capacity, 102K BTU Net IBR Capacity. Includes Circulator.
7% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(31)
Q&As (3)
$2,034.51
In-Stock
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Model Number 381357804 is the Number 3 Seller
Learn More About 381357804
Model 381357804 is a Recommended Product
Weil-McLain CGa-4-PIDN - 88K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357804
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 Circulator.
6% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(26)
Q&As (3)
$1,818.81
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Model Number 381357808 is the Number 4 Seller
Learn More About 381357808
Model 381357808 is a Recommended Product
Weil-McLain CGa-6-PIDN - 146K BTU - 83.2% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357808
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 146K BTU DOE Capacity, 127K BTU Net IBR Capacity. Includes Circulator.
6% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(26)
Q&As (2)
$2,328.91
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Model Number K2-120 is the Number 5 Seller
Learn More About K2-120
Model K2-120 is a Recommended Product
Burnham K2WT-120 - 111K BTU - 94.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: K2-120
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 111K BTU DOE Capacity, 97K BTU Net IBR Capacity. Includes Taco Circulator.
5% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
Q&As (2)
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$1,819.30
Was 
$2,599.00
SAVE $779.70
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Learn More About 383100050
Weil-McLain AquaBalance™ AB-155-C - 144K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: 383100050
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 144K BTU DOE Capacity, 125K BTU Net IBR Capacity. Includes Circulator.
4% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(6)
Q&A (1)
$2,419.00
In-Stock
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Learn More About CB199DV-NG
Noritz CB199 - 120k BTU - 95.1% AFUE - Combi Gas Boiler - Direct Vent
Model: CB199DV-NG
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 109K BTU DOE Capacity, 95K BTU Net IBR Capacity. Includes Circulator.
4% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(3)
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$1,870.00
Was 
$2,170.00
SAVE $300.00
Only 1 In-Stock
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Learn More About 381357800
Model 381357800 is a Recommended Product
Weil-McLain CGa-25-PIDN - 44K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357800
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 52K BTU Gross Input, 44K BTU DOE Capacity, 38K BTU Net IBR Capacity. Includes Circulator.
3% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(26)
Q&As (3)
$1,512.11
In-Stock
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Learn More About 381357802
Model 381357802 is a Recommended Product
Weil-McLain CGa-3-PIDN - 59K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357802
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 70K BTU Gross Input, 59K BTU DOE Capacity, 51K BTU Net IBR Capacity. Includes Circulator.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(27)
Q&As (3)
$1,670.52
In-Stock
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Learn More About GWA-105-N-T-S2
Model GWA-105-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-105-N-T-S2
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 Circulator.
2% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(15)
Q&As (5)
$1,619.00
Factory-Direct
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Learn More About 382200611
Weil-McLain GV90+4 - 97K BTU - 91.2% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 382200611
Floor Mounted, Cast Iron Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 97K BTU DOE Capacity, 84K BTU Net IBR Capacity. Includes Circulator.
2% Buy This
4.4 out of 54.4 out of 54.4 out of 54.4 out of 54.4 out of 5(5)
Q&As (2)
$3,003.07
In-Stock
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Learn More About K2WTC-135B-6T00
Burnham K2 - 112K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: K2WTC-135B-6T00
Wall Mounted Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Domestic Hot Water Priority. Includes Taco Circulator. Low Nox. Ratings: 120K BTU Gross Input, 112K BTU DOE Capacity, 97K BTU Net IBR Capacity.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(3)
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$2,299.00
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Learn More About NRCB199DV-NG
Noritz NRCB199 - 120k BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: NRCB199DV-NG
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% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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$2,339.00
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Learn More About MI-05-SPRK-WPC-N
Peerless MI-05 - 115K BTU - 82.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: MI-05-SPRK-WPC-N
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 115K BTU DOE Capacity, 100K BTU Net IBR Capacity.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$2,179.00
Only 4 In-Stock
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Learn More About 381357810
Model 381357810 is a Recommended Product
Weil-McLain CGa-7-PIDN - 175K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357810
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 210K BTU Gross Input, 175K BTU DOE Capacity, 152K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(28)
Q&As (3)
$2,583.38
In-Stock
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Learn More About 381357866
Model 381357866 is a Recommended Product
Weil-McLain CGi-6-PIN - 140K BTU - 83.3% AFUE - Hot Water Gas Boiler - Power Vent
Model: 381357866
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 167K BTU Gross Input, 140K BTU DOE Capacity, 122K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(14)
Q&As (2)
$2,530.41
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Learn More About 383800004
Weil-McLain ECO 110 - 101K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383800004
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 101K BTU DOE Capacity, 88K BTU Net IBR Capacity.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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$2,585.18
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Learn More About ZBR28-3
Bosch Greenstar 100 - ZBR28 - 89K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ZBR28-3
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 101K BTU Gross Input, 89K BTU DOE Capacity, 79K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
Q&As (3)
$2,485.00
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Learn More About ZBR42-3
Bosch Greenstar 151 - ZBR42 - 134K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ZBR42-3
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 152K BTU Gross Input, 134K BTU DOE Capacity, 117K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(2)
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$3,199.00
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Learn More About 7738003478
Buderus GC144/4 - 87K BTU - 85.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 7738003478
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 103K BTU Gross Input, 87K BTU DOE Capacity, 76K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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$2,161.00
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Learn More About K2WT-120A-4G00
Burnham K2WT-120 - 111K BTU - 94.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: K2WT-120A-4G00
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 111K BTU DOE Capacity, 97K BTU Net IBR Capacity. Includes Grundfos Circulator.
1% Buy This
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On Sale Ends 06/30
$1,819.30
Was 
$2,599.00
SAVE $779.70
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Learn More About 381357864
Model 381357864 is a Recommended Product
Weil-McLain CGi-5-PIN - 100K BTU - 83.3% AFUE - Hot Water Gas Boiler - Power Vent
Model: 381357864
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 119K BTU Gross Input, 100K BTU DOE Capacity, 87K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(16)
Q&As (2)
$2,248.09
In-Stock
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Learn More About 113081388
Model 113081388 is a Recommended Product
Weil-McLain CGa-8-PIDN - 204K BTU - 82.7% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 113081388
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 245K BTU Gross Input, 204K BTU DOE Capacity, 177K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(15)
Q&A (1)
$3,082.91
In-Stock
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Learn More About 381357856
Model 381357856 is a Recommended Product
Weil-McLain CGi-25-PIN - 42K BTU - 84.0% AFUE - Hot Water Gas Boiler - Power Vent
Model: 381357856
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 50K BTU Gross Input, 42K BTU DOE Capacity, 37K BTU Net IBR Capacity. Includes Circulator.
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$1,688.00
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