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 SHADW150HNZ1SU is a Hot Seller
Learn More About Crown Boiler Co. SHADW150HNZ1SU
Crown Boiler Shadow - 142k BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent - Up to 2,000 ft. Altitude
Model: SHADW150HNZ1SU
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity.
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On Sale Ends 03/31
$1,449.00
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$2,898.00
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Model Number E75CRP is a Recently Added Product
Learn More About Rinnai E75CRP
Rinnai
Rinnai E-Series - 69K BTU - 95.5% AFUE - Propane Combi Boiler - Direct Vent
Model: E75CRP
Wall Mounted, Condensing Combi Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 75K BTU Gross Input, 69K BTU DOE Capacity, 60K BTU Net IBR Capacity. Includes Circulator.
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Model E75CRP is a Closeout
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$1,324.00
Was 
$2,790.00
SAVE $1,466.00
Only 4 In-Stock
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Model Number CB180DV-NG is the Number 1 Seller
Learn More About Noritz CB180DV-NG
Noritz CB180 - 92K 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.
42% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(10)
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On Sale Ends 03/31
$1,059.00
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$2,116.63
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Model Number CB199DV-NG is the Number 2 Seller
Learn More About Noritz CB199DV-NG
Noritz CB199 - 109K 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.
33% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(10)
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On Sale Ends 03/31
$1,129.00
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$2,260.13
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Model Number NRCB199DV-LP is the Number 3 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.
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(7)
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$2,099.00
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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Model Number 383100030 is the Number 4 Seller
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.
2% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 03/31
$1,909.00
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$2,009.00
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Model Number NRCB199DV-NG is the Number 5 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.
2% Buy This
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5(7)
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$2,329.00
Only 2 In-Stock
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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.
1% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 03/31
$2,051.00
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$2,159.00
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Learn More About Weil-McLain 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
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(12)
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On Sale Ends 03/31
$1,956.00
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$2,059.00
SAVE $103.00
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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.
1% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 03/31
$1,994.00
Was 
$2,099.00
SAVE $105.00
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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
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 Weil-McLain EVG 110
Weil-McLain EVG 110 - 101K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900005
Floor/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.
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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On Sale Ends 03/31
$2,897.00
Was 
$3,049.00
SAVE $152.00
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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 383100045
Weil-McLain AquaBalance™ AB-120-H - 112K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383100045
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 112K BTU DOE Capacity, 97K BTU Net IBR Capacity.
1% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 03/31
$1,772.00
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$1,865.00
SAVE $93.00
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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.
1% Buy This
4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5(13)
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On Sale Ends 03/31
$1,681.00
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$1,769.00
SAVE $88.00
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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 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
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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.
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
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Learn More About Electro Industries 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
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-12
Electro Industries EB-MX-12 - 11.5 kW - 39K BTU - Hot Water Electric Boiler - 208/240V - 1 Phase
Model: EB-MX-12
Wall Mounted Boiler with Modulating Operation. Ships Packaged. Includes Outdoor Reset Capability.
1% Buy This
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$1,682.00
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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-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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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
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)
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$2,649.00
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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 Burnham K2-150
Burnham K2WT-150 - 141K BTU - 95.0% AFUE - Hot Water Gas Boiler - Direct Vent
Model: K2-150
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 141K BTU DOE Capacity, 123K 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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$2,799.00
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Learn More About Weil-McLain 383500735
Weil-McLain Ultra 155 - 139K BTU - 94% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383500735
Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 139K BTU DOE Capacity, 123K 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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On Sale Ends 03/31
$3,134.00
Was 
$3,299.00
SAVE $165.00
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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.
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
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*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.
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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.
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$2,299.00
In-Stock
Freight Icon
Free Shipping & Lift Gate
Learn More About Free Freight
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
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