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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 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.
14% 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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On Sale Ends 04/30
$1,765.00
Was 
$2,065.00
SAVE $300.00
Only 3 In-Stock
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Model Number CB199DV-LP is the Number 2 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.
11% 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 04/30
$1,870.00
Was 
$2,170.00
SAVE $300.00
Only 4 In-Stock
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Model Number EB-MX-15 is the Number 3 Seller
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.
7% 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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Model Number 383100050 is the Number 4 Seller
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.
6% 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)
$2,419.00
In-Stock
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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.
6% 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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On Sale Ends 04/30
$1,819.30
Was 
$2,599.00
SAVE $779.70
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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.
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)
Q&A (1)
$1,720.00
Only 2 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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On Sale Ends 04/30
$1,870.00
Was 
$2,170.00
SAVE $300.00
Only 2 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.
4% 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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On Sale Ends 04/30
$1,765.00
Was 
$2,065.00
SAVE $300.00
Only 3 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.
3% 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
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.
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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On Sale Ends 04/30
$2,151.88
Was 
$2,339.00
SAVE $187.12
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Learn More About ZWB35-3
Model ZWB35-3 is a Recommended Product
Bosch Greenstar Combi 131 - ZBW35 - 117K BTU - 95.0% AFUE - Combi Gas Boiler - Direct Vent
Model: ZWB35-3
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 132K BTU Gross Input, 117K BTU DOE Capacity, 103K 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(5)
Q&A (1)
$3,199.00
Factory-Direct
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Learn More About 383100040
Weil-McLain AquaBalance™ AB-120-C - 112K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: 383100040
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% 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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$2,289.00
Only 2 In-Stock
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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.
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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$2,585.18
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.
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)
Q&As (3)
$2,519.00
Factory-Direct
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Learn More About NRCB180DV-LP
Noritz NRCB180 - 100k BTU - 95% AFUE - Combi Propane Boiler - Direct Vent
Model: NRCB180DV-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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On Sale Ends 04/30
$2,023.08
Was 
$2,199.00
SAVE $175.92
Only 1 In-Stock
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Learn More About 383500738
Weil-McLain Ultra 399 - 364 BTU - 91.7% Thermal Efficiency - Hot Water Gas Boiler - Direct Vent
Model: 383500738
Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 399K BTU Gross Input, 365K BTU DOE Capacity, 317K 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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$6,421.27
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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.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(8)
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Model 383100010 is a Closeout
Closeout
$1,999.00
Was 
$2,109.00
SAVE $110.00
Only 1 In-Stock
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Learn More About ZWB42-3
Model ZWB42-3 is a Recommended Product
Bosch Greenstar Combi 151 - ZBW42 - 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.
2% 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&As (2)
$3,399.00
Factory-Direct
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Learn More About EMB-H-5
Electro Industries EMB-H-5 - 4.5 kW - 15K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EMB-H-5
Wall Mounted Boiler with Modulating Operation. Ships Packaged.
2% 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)
$969.00
Factory-Direct
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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 K2-100
Model K2-100 is a Recommended Product
Burnham K2WT-100 - 92K BTU - 93.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: K2-100
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 100K BTU Gross Input, 92K BTU DOE Capacity, 80K BTU Net IBR Capacity. Includes Taco 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)
Q&As (2)
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On Sale Ends 04/30
$1,728.30
Was 
$2,469.00
SAVE $740.70
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Learn More About 383700007
Weil-McLain WM97+ 110 CT - 101K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383700007
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 101K BTU DOE Capacity, 88K 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(1)
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$3,469.00
In-Stock
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Learn More About EMB-H-7
Electro Industries EMB-H-7 - 7 kW - 24K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EMB-H-7
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
Factory-Direct
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Learn More About EB-MX-10
Electro Industries EB-MX-10 - 10 kW - 34K BTU - Hot Water Electric Boiler - 240V - 1 Phase
Model: EB-MX-10
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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$1,476.00
Factory-Direct
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