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High Efficiency Gas Boilers

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Get more heat for less energy with a high efficiency gas boiler. We carry a wide selection of gas boilers from the top manufacturers in the industry. Shop now and find your perfect high efficiency gas boiler.
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Model Number INS110S is a Recently Added Product
Learn More About INS110S
Triangle Tube Instinct - 110K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: INS110S
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 102K BTU DOE Capacity, 89K BTU Net IBR Capacity.
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$1,999.00
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Model Number 383100020 is the Number 1 Seller
Learn More About 383100020
Weil-McLain AquaBalance™ WMB-120C - 109K BTU - 92.2% AFUE - Combi Gas Boiler - Direct Vent
Model: 383100020
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.
33% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(9)
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Model 383100020 is a Closeout
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On Sale Ends 10/31
$1,099.50
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$2,199.00
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Model Number 383100025 is the Number 2 Seller
Learn More About 383100025
Weil-McLain AquaBalance™ WMB-120 - 109K BTU - 92.2% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383100025
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 109K BTU DOE Capacity, 95K BTU Net IBR Capacity.
16% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(9)
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Model 383100025 is a Closeout
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On Sale Ends 10/31
$974.50
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$1,949.00
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Model Number 383100010 is the Number 3 Seller
Learn More About 383100010
Weil-McLain AquaBalance™ WMB-80C - 73K BTU - 92.4% AFUE - Combi Gas Boiler - Direct Vent
Model: 383100010
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 73K BTU DOE Capacity, 63K 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(10)
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Model 383100010 is a Closeout
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On Sale Ends 10/31
$1,054.50
Was 
$2,109.00
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Model Number K2WT-120A-4G00 is the Number 4 Seller
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.
6% 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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$1,299.50
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$2,599.00
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Model Number CB199DV-LP is the Number 5 Seller
Learn More About CB199DV-LP
Noritz CB199 - 120k BTU - 95.1% AFUE - Combi Propane Boiler - Direct Vent
Model: CB199DV-LP
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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$2,170.00
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Learn More About X-C120A-4L02
Burnham X-C120 - 112K BTU - 94.0% AFUE - Hot Water Gas Boiler- Direct Vent
Model: X-C120A-4L02
Wall Mounted, Condensing Boiler. Ships Packaged. Ratings: 120K BTU Gross Input, 111K BTU DOE Capacity, 97K BTU Net IBR Capacity.
3% 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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$1,110.00
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$2,220.00
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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.
3% 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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$2,170.00
Only 3 In-Stock
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Learn More About CB180DV-LP
Noritz CB180 - 100k BTU - 95.1% AFUE - Combi Propane Boiler - Direct Vent
Model: CB180DV-LP
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.
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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$2,065.00
Only 2 In-Stock
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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.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(7)
Q&A (1)
$2,419.00
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Learn More About NRCB199DV-LP
Noritz NRCB199 - 120k BTU - 95% AFUE - Combi Propane Boiler - Direct Vent
Model: NRCB199DV-LP
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.
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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$2,149.00
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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.
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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$2,149.00
Only 2 In-Stock
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Learn More About 382200613
Weil-McLain GV90+6 - 161K BTU - 91.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 382200613
Floor Mounted, Cast Iron Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 161K BTU DOE Capacity, 140K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5(7)
Q&A (2)
$3,874.86
Only 1 In-Stock
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Learn More About 382200612
Weil-McLain GV90+5 - 130K BTU - 91.4% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 382200612
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.
1% Buy This
4.5 out of 54.5 out of 54.5 out of 54.5 out of 54.5 out of 5(6)
Q&A (2)
$3,445.49
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Learn More About ZWB42-3
Model ZWB42-3 is a Recommended Product
Bosch Greenstar Combi 151 - ZWB42 - 134K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent
Model: ZWB42-3
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(5)
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$3,349.00
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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.
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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$2,065.00
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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.
1% Buy This
4.5 out of 54.5 out of 54.5 out of 54.5 out of 54.5 out of 5(6)
Q&A (2)
$3,003.07
Only 4 In-Stock
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Learn More About K2WTC-180B-6T02
Burnham K2 - 169K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: K2WTC-180B-6T02
Wall Mounted Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Domestic Hot Water Priority. Includes Taco Circulator. Low Nox. Ratings: 180K BTU Gross Input, 169K BTU DOE Capacity, 147K 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(3)
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$2,794.00
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Learn More About CC 125H
Triangle Tube CC 125H - 111K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: CC 125H
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 125K BTU Gross Input, 111K BTU DOE Capacity, 97K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
4.5 out of 54.5 out of 54.5 out of 54.5 out of 54.5 out of 5(2)
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$2,039.00
Only 5 In-Stock
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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&A (3)
$2,459.00
Only 2 In-Stock
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Learn More About K2-180
Burnham K2WT-180 - 167K BTU - 94.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: K2-180
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 180K BTU Gross Input, 167K BTU DOE Capacity, 148K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
3.0 out of 53.0 out of 53.0 out of 53.0 out of 53.0 out of 5(2)
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$2,999.00
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Learn More About 383800005
Weil-McLain ECO 155 - 143K BTU - 95.1% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383800005
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 143K BTU DOE Capacity, 124K 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(1)
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$2,848.47
Only 3 In-Stock
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Learn More About X-C100A-4L02
Burnham X-C100 - 92K BTU - 93.3% AFUE - Hot Water Gas Boiler - Direct Vent
Model: X-C100A-4L02
Wall Mounted, Condensing Boiler. Ships Packaged. Ratings: 100K BTU Gross Input, 92K BTU DOE Capacity, 80K BTU Net IBR Capacity.
1% Buy This
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On Sale Ends 10/31
$1,110.00
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$2,220.00
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Model Number INS155C is a Recently Added Product
Learn More About INS155C
Triangle Tube Instinct - 155K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: INS155C
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity. Includes Circulator.
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$2,199.00
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