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 NRCB199DV-LP is the Number 1 Seller
Learn More About Noritz NRCB199DV-LP
Noritz NRCB199 - 111K 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.
16% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(9)
View All Modulating Boilers on Sale
On Sale Ends 07/14
$1,931.08
Was 
$2,099.00
SAVE $167.92
Only 2 In-Stock
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Model Number 383100050 is the Number 2 Seller
Learn More About Weil-McLain 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.
9% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(12)
Q&A (1)
$2,159.00
In-Stock
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Model Number E110SRN is the Number 3 Seller
Learn More About Rinnai E110SRN
Rinnai
Rinnai E-Series - 101K BTU - 95.5% AFUE - Hot Water Gas Boiler - Direct Vent
Model: E110SRN
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 11K BTU Gross Input, 101K BTU DOE Capacity, 88K BTU Net IBR Capacity. Includes Circulator.
9% Buy This
4.0 out of 54.0 out of 54.0 out of 54.0 out of 54.0 out of 5(1)
Model E110SRN is a Closeout
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$1,321.00
Was 
$2,600.00
SAVE $1,279.00
Only 3 In-Stock
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Model Number NRCB199DV-NG is the Number 4 Seller
Learn More About Noritz NRCB199DV-NG
Noritz NRCB199 - 111K 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.
6% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(9)
View All Modulating Boilers on Sale
On Sale Ends 07/14
$2,142.68
Was 
$2,329.00
SAVE $186.32
Only 1 In-Stock
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Model Number EMB-H-9 is the Number 5 Seller
Learn More About Electro Industries 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.
5% 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)
$1,049.00
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Learn More About Weil-McLain 383100035
Weil-McLain AquaBalance™ AB-80-H - 75K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383100035
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 75K BTU DOE Capacity, 65K BTU Net IBR Capacity.
4% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
$1,769.00
Only 2 In-Stock
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Learn More About Triangle Tube 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.
4% Buy This
Write a Review
$4,689.00
In-Stock
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Learn More About Weil-McLain 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.
3% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
$2,099.00
Only 4 In-Stock
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Learn More About Weil-McLain 383100030
Weil-McLain AquaBalance™ AB-80-C - 75K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: 383100030
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 75K BTU DOE Capacity, 65K BTU Net IBR Capacity. Includes Circulator.
3% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
$2,009.00
Only 5 In-Stock
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Learn More About Crown Boiler Co. SHADW120HNZ10U
Crown Boiler Shadow - 112k BTU - 94% AFUE - Hot Water Gas Boiler - Direct Vent - 4,500 to 10,200 ft. Altitude
Model: SHADW120HNZ10U
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% Buy This
Write a Review
$1,100.00
Was 
$2,200.00
SAVE $1,100.00
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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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Learn More About Noritz NRCB180DV-LP
Noritz NRCB180 - 92K 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
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(9)
View All Modulating Boilers on Sale
On Sale Ends 07/14
$1,977.08
Was 
$2,149.00
SAVE $171.92
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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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Learn More About Weil-McLain 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.
2% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(4)
$5,099.00
Only 3 In-Stock
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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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Learn More About Triangle Tube 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.
2% Buy This
4.5 out of 54.5 out of 54.5 out of 54.5 out of 54.5 out of 5(2)
$2,039.00
Only 4 In-Stock
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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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Learn More About Buderus GB162-100
Buderus GB162-100 - 298K BTU - 96.1% AFUE - Hot Water Gas Boiler - Direct Vent
Model: GB162-100
Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 333K BTU Gross Input, 298K BTU DOE Capacity, 259K 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)
$7,029.00
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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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Learn More About Weil-McLain EVG 155
Weil-McLain EVG 155 - 143K BTU - 95.1% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900006
Floor/Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 143K BTU DOE Capacity, 124K 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)
$3,579.00
In-Stock
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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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Learn More About Triangle Tube INS199C
Triangle Tube Instinct - 184K 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.
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)
$2,299.00
In-Stock
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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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Learn More About Triangle Tube INS155S
Triangle Tube Instinct - 142K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: INS155S
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity.
2% Buy This
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$2,099.00
In-Stock
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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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Learn More About Crown Boiler Co. SHADW180HNZ1SU
Crown Boiler Shadow - 170k BTU - 94% AFUE - Hot Water Gas Boiler - Direct Vent - Up to 2,000 ft. Altitude
Model: SHADW180HNZ1SU
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 180K BTU Gross Input, 170K BTU DOE Capacity, 148K BTU Net IBR Capacity.
2% Buy This
Write a Review
$1,449.00
Was 
$2,898.00
SAVE $1,449.00
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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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Learn More About Noritz NRCB180DV-NG
Noritz NRCB180 - 92K BTU - 95% AFUE - Combi Gas Boiler - Direct Vent
Model: NRCB180DV-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
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(9)
View All Modulating Boilers on Sale
On Sale Ends 07/14
$1,977.08
Was 
$2,149.00
SAVE $171.92
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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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Learn More About Bosch Thermotechnology ZWB42-3
Model ZWB42-3 is a Recommended Product
Bosch Greenstar Combi 151 - 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
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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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Learn More About Electro Industries 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)
$1,509.00
Only 1 In-Stock
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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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Learn More About Electro Industries 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)
$1,689.00
In-Stock
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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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Learn More About Electro Industries EB-WX-27-2
Electro Industries EB-WX-27-2 - 27 kW - 92K BTU - Hot Water Electric Boiler - 208V - 3 Phase
Model: EB-WX-27-2
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)
$2,680.00
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Learn More About Bosch Thermotechnology ZBR21-3
Bosch Greenstar 79 - ZBR21 - 71K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: ZBR21-3
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 79K BTU Gross Input, 71K BTU DOE Capacity, 62K BTU Net IBR Capacity. Includes Circulator.
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$2,399.00
Factory-Direct
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Free Shipping & Lift Gate
*This product qualifies for Free Shipping anywhere in the contiguous US. Accessories may ship separately. Items over 100lbs shipped via semi-truck, be sure to select "Lift Gate" to lower the product to the ground curbside. Remote area surcharges may apply, see our full shipping policy for more details.
2% Check Discount Icon
2% Check Discount
Learn More About 2% Check Discount
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.
Add To Cart