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Natural Gas Boilers

307 Products
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DOE Heating Capacity (BTU) Learn More
DOE Heating Capacity (BTU)
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.
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Net I=B=R Capacity (BTU) Learn More
Net I=B=R Capacity (BTU)
I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.
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Maximum Input Capacity (BTU) Learn More
Maximum Input Capacity (BTU)
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
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AFUE (%) Learn More
AFUE (%)
AFUE (Annual Fuel Utilization Efficiency) measures the efficiency of combustion equipment over the entire heating season, and is calculated by dividing the amount of energy that is actually heating your home by the total energy contained in the fuel used by the boiler/furnace.
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Vent Type Learn More
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
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Medium Learn More
Medium
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.
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Modulating/Staging Learn More
Modulating/Staging
Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control.
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Ultra Low NOx Emissions Learn More
Ultra Low NOx Emissions
NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx.
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Efficiency (%)
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Low NOx Emissions Learn More
Low NOx Emissions
NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Low NOx appliances emit less than 40 ng/J (nanogram per Joule) of NOx.
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Product Line
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DHW Production Learn More
DHW Production
DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.
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Product Height (Inches)
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Sale: $1,729.00
On Sale Through 06/24
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Sale: $1,785.00
On Sale Through 06/24
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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.
Item#: 82299
Model#: NRCB180DV-NG
Brand: Noritz
Originally $2,600.00$1,700.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Grundfos Circulator and LWCO. Ratings: 103K BTU Gross Input, 87K BTU DOE Capacity, 76K BTU Net IBR Capacity.
Item#: 102567
Model#: 204EN-G0
Brand: Burnham
$3,024.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Taco Circulator and LWCO. Ratings: 103K BTU Gross Input, 87K BTU DOE Capacity, 76K BTU Net IBR Capacity.
Item#: 102568
Model#: 204EN-T0
Brand: Burnham
$2,818.00
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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.
Item#: 94361
Model#: 383100050
Brand: Weil-McLain
$2,675.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 100k BTU Gross Input, 85k BTU DOE Capacity, 74k BTU Net IBR Capacity. Includes Circulator.
Item#: 109081
Model#: 381359074
Brand: Weil-McLain
$2,632.75
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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.
Item#: 58491
Model#: 383900000
Brand: Weil-McLain
$6,204.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Included Grundfos Circulator and LWCO. Ratings: 172K BTU Gross Input, 145K BTU DOE Capacity, 126K BTU Net IBR Capacity.
Item#: 102571
Model#: 206EN-G0
Brand: Burnham
$3,595.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 172K BTU Gross Input, 142K BTU DOE Capacity, 107K BTU Net IBR Capacity.
Item#: 24035
Brand: Crown Boiler Co.
$3,742.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve and Hydrolevel sensors. Ships Packaged. Ratings: 105K BTU Gross Input, 87K BTU DOE Capacity, 65K BTU Net IBR Capacity.
Item#: 37816
Model#: PIN4SNI-HE2
Brand: Burnham
$3,691.00
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Floor Mounted, Cast Iron Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 97K BTU DOE Capacity, 84K BTU Net IBR Capacity. Includes Circulator.
Item#: 49647
Model#: 382200611
Brand: Weil-McLain
$3,915.00
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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.
Item#: 79377
Model#: 383500735
Brand: Weil-McLain
$4,068.00
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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.
Item#: 82121
Model#: 383900005
Brand: Weil-McLain
$3,614.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 155K BTU Gross Input, 144K BTU DOE Capacity, 125K BTU Net IBR Capacity.
Item#: 94358
Model#: 383100055
Brand: Weil-McLain
$2,695.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 67k BTU Gross Input, 56k BTU DOE Capacity, 49k BTU Net IBR Capacity. Includes Circulator.
Item#: 109079
Model#: 381359072
Brand: Weil-McLain
$2,479.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 200k BTU Gross Input, 170k BTU DOE Capacity, 148k BTU Net IBR Capacity. Includes Circulator.
Item#: 109087
Model#: 381359080
Brand: Weil-McLain
$3,684.00
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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.
Item#: 37392
Model#: ZWB28-3A
Brand: Bosch Thermotechnology
$3,072.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 103K BTU Gross Input, 85K BTU DOE Capacity, 64K BTU Net IBR Capacity.
Item#: 24031
Brand: Crown Boiler Co.
$3,091.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 138K BTU Gross Input, 113K BTU DOE Capacity, 85K BTU Net IBR Capacity.
Item#: 24033
Brand: Crown Boiler Co.
$3,100.00
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Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 276K BTU Gross Input, 229K BTU DOE Capacity, 172K BTU Net IBR Capacity.
Item#: 24041
Brand: Crown Boiler Co.
$4,739.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 94K BTU DOE Capacity, 81K BTU Net IBR Capacity. Includes Circulator.
Item#: 79376
Model#: 383500734
Brand: Weil-McLain
$3,428.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 230K BTU Gross Input, 207K BTU DOE Capacity, 183K BTU Net IBR Capacity. Includes Circulator.
Item#: 79378
Model#: 383500736
Brand: Weil-McLain
$4,990.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 299K BTU Gross Input, 270K BTU DOE Capacity, 234K BTU Net IBR Capacity. Includes Circulator.
Item#: 79379
Model#: 383500737
Brand: Weil-McLain
$6,759.00
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