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Natural Gas Hot Water Boilers

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Natural gas hot water boilers are one of the most popular types of boilers in the country. We carry a full selection of natural gas hot water boilers from the top brands in the industry. Find yours today.
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Model Number 381357804 is the Number 1 Seller
Learn More About 381357804
Model 381357804 is a Recommended Product
Weil-McLain CGa-4-PIDN - 88K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357804
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 88K BTU DOE Capacity, 77K BTU Net IBR Capacity. Includes Circulator.
9% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(26)
Q&As (3)
$1,760.00
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Model Number 381357806 is the Number 2 Seller
Learn More About 381357806
Model 381357806 is a Recommended Product
Weil-McLain CGa-5-PIDN - 117K BTU - 83.5% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357806
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 117K BTU DOE Capacity, 102K BTU Net IBR Capacity. Includes Circulator.
9% Buy This
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(30)
Q&As (3)
$1,970.00
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Model Number CB180DV-NG is the Number 3 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.
9% 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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View All Natural Gas Hot Water Boilers on Sale
On Sale Ends 04/30
$1,765.00
Was 
$2,065.00
SAVE $300.00
Only 5 In-Stock
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Model Number CB199DV-NG is the Number 4 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.
5% 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
$1,870.00
Was 
$2,170.00
SAVE $300.00
Only 2 In-Stock
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Model Number 381357800 is the Number 5 Seller
Learn More About 381357800
Model 381357800 is a Recommended Product
Weil-McLain CGa-25-PIDN - 44K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357800
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 52K BTU Gross Input, 44K BTU DOE Capacity, 38K 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(26)
Q&As (3)
$1,497.00
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Learn More About 383100005
Weil-McLain AquaBalance™ WMB-155 - 143K BTU - 94.4% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383100005
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 143K BTU DOE Capacity, 124K BTU Net IBR Capacity.
4% 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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$2,139.00
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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.
4% 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
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Learn More About 381357808
Model 381357808 is a Recommended Product
Weil-McLain CGa-6-PIDN - 146K BTU - 83.2% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357808
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 146K BTU DOE Capacity, 127K 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(26)
Q&As (2)
$2,268.95
In-Stock
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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.
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)
Q&As (2)
View All Natural Gas Hot Water Boilers on Sale
On Sale Ends 03/31
$1,819.30
Was 
$2,599.00
SAVE $779.70
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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.
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)
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$2,289.00
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Learn More About 381357810
Model 381357810 is a Recommended Product
Weil-McLain CGa-7-PIDN - 175K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357810
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 210K BTU Gross Input, 175K BTU DOE Capacity, 152K 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(28)
Q&As (3)
$2,529.00
In-Stock
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Learn More About EVG 399
Model EVG 399 is a Recommended Product
Weil-McLain EVG 399 - 383K BTU - 96.5% AFUE - Hot Water Gas Boiler - Direct Vent
Model: EVG 399
Floor/Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 399K BTU Gross Input, 383K BTU DOE Capacity, 333K 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(3)
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$7,445.95
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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.
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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$2,339.00
Only 2 In-Stock
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Learn More About 381357802
Model 381357802 is a Recommended Product
Weil-McLain CGa-3-PIDN - 59K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381357802
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 70K BTU Gross Input, 59K BTU DOE Capacity, 51K 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(27)
Q&As (3)
$1,652.00
In-Stock
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Learn More About GWA-052-N-T-S2
Model GWA-052-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-052 - 43K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-052-N-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 52K BTU Gross Input, 43K BTU DOE Capacity, 37K BTU Net IBR Capacity. Includes Circulator.
2% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(14)
Q&As (5)
$1,389.00
Factory-Direct
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Learn More About 381357937
Model 381357937 is a Recommended Product
Weil-McLain CGi-4-PIN - 76K BTU - 85.0% AFUE - Hot Water Gas Boiler - Power Vent
Model: 381357937
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 90K BTU Gross Input, 76K BTU DOE Capacity, 66K 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)
$2,059.00
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
4.5 out of 54.5 out of 54.5 out of 54.5 out of 54.5 out of 5(6)
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$3,499.00
In-Stock
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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.
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)
$3,199.00
Factory-Direct
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Learn More About 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
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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$2,029.00
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Learn More About 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
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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$1,929.00
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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.
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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$6,231.00
Only 1 In-Stock
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Learn More About GWA-105-N-T-S2
Model GWA-105-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-105-N-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 88K BTU DOE Capacity, 77K BTU Net IBR Capacity. Includes Circulator.
1% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(15)
Q&As (5)
$1,619.00
Only 1 In-Stock
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Learn More About 381357866
Model 381357866 is a Recommended Product
Weil-McLain CGi-6-PIN - 140K BTU - 83.3% AFUE - Hot Water Gas Boiler - Power Vent
Model: 381357866
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 167K BTU Gross Input, 140K BTU DOE Capacity, 122K 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(14)
Q&As (2)
$2,496.00
In-Stock
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Learn More About GWA-070-N-T-S2
Model GWA-070-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-070 - 58K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-070-N-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 70K BTU Gross Input, 58K BTU DOE Capacity, 50K BTU Net IBR Capacity. Includes Circulator.
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4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(14)
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$1,449.00
Factory-Direct
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Free Shipping & Lift Gate
Learn More About Free Freight *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 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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