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Modulating Boilers

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Modulating boilers continuously adjust your home's heating needs, resulting a consistent temperature and reduced fuel usage. Shop our wide selection of modulating boilers and find the perfect one for your home today.
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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.
29% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(13)
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Model 383100020 is a Closeout
Closeout
$1,319.40
Was 
$2,199.00
SAVE $879.60
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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.
20% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(12)
Q&A (1)
Model 383100025 is a Closeout
Closeout
$1,169.40
Was 
$1,949.00
SAVE $779.60
In-Stock
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Model Number CB199DV-NG is the Number 3 Seller
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.
8% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(4)
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View All Modulating Boilers on Sale
On Sale Ends 12/31
$1,129.00
Was 
$2,260.13
SAVE $1,131.13
In-Stock
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Model Number CB199DV-LP is the Number 4 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.
8% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(4)
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View All Modulating Boilers on Sale
On Sale Ends 12/31
$1,129.00
Was 
$2,260.13
SAVE $1,131.13
In-Stock
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Model Number 383100010 is the Number 5 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.
7% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(13)
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Model 383100010 is a Closeout
Closeout
$1,265.40
Was 
$2,109.00
SAVE $843.60
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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.
5% 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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View All Modulating Boilers on Sale
On Sale Ends 12/31
$1,059.00
Was 
$2,116.63
SAVE $1,057.63
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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.
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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On Sale Ends 12/31
$1,059.00
Was 
$2,116.63
SAVE $1,057.63
In-Stock
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Learn More About EMB-H-9
Electro Industries EMB-H-9 - 9 kW - 31K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EMB-H-9
Wall Mounted Boiler with Modulating Operation. Ships Packaged.
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)
Q&A (1)
$999.00
Only 3 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.
1% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(10)
Q&A (1)
$2,159.00
In-Stock
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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(3)
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$2,099.00
Only 4 In-Stock
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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(3)
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$2,329.00
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Learn More About 383100055
Weil-McLain AquaBalance™ AB-155-H - 144K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383100055
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 144K BTU DOE Capacity, 125K BTU Net IBR Capacity.
1% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(9)
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$2,059.00
Only 2 In-Stock
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Learn More About EB-MX-20
Electro Industries EB-MX-20 - 20 kW - 68K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EB-MX-20
Wall Mounted Boiler with Modulating Operation. Ships Packaged. Includes Outdoor Reset Capability.
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)
Q&A (1)
$1,720.00
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.
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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$2,299.00
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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 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.
1% Buy This
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$2,199.00
In-Stock
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Learn More About INS199C
Triangle Tube Instinct - 199K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: INS199C
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 199K BTU Gross Input, 184K BTU DOE Capacity, 159K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
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$2,299.00
In-Stock
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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)
Q&A (2)
$3,349.00
Only 4 In-Stock
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Learn More About EVG 299
Model EVG 299 is a Recommended Product
Weil-McLain EVG 299 - 280K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900001
Floor/Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 299K BTU Gross Input, 280K BTU DOE Capacity, 243K 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(4)
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$6,879.00
In-Stock
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Learn More About EB-MX-15
Electro Industries EB-MX-15 - 15 kW - 51K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EB-MX-15
Wall Mounted Boiler with Modulating Operation. Ships Packaged. Includes Outdoor Reset Capability.
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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$1,656.00
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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 PA250
Triangle Tube PA250 - 222K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: PA250
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 240K BTU Gross Input, 222K BTU DOE Capacity, 193K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
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$4,689.00
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Learn More About EVG 220
Model EVG 220 is a Recommended Product
Weil-McLain EVG 220 - 206K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900000
Floor/Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 220K BTU Gross Input, 206K BTU DOE Capacity, 179K 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(4)
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$5,099.00
In-Stock
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Learn More About EB-WX-27
Electro Industries EB-WX-27 - 27 kW - 92K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EB-WX-27
Wall Mounted Boiler with Modulating Operation. Ships Packaged. Includes Outdoor Reset Capability.
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)
Q&A (1)
$2,649.00
Only 2 In-Stock
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2% Check Discount
Learn More About 2% Check Discount Save 2% instantly by using our convenient "e-check" option or by simply mailing us a paper check. Yes, your order will be delayed slightly (5 business days). But, if you can wait, the savings are significant.
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