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Condensing Hot Water Boilers

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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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Fuel Type Learn More
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
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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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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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Product Width (Inches)
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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#: 37393
Model#: ZBR28-3
Brand: Bosch Thermotechnology
$3,394.00
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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.
Item#: 49649
Model#: 382200613
Brand: Weil-McLain
$5,789.00
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Floor Mounted, Cast Iron Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 70K BTU Gross Input, 65K BTU DOE Capacity, 56K BTU Net IBR Capacity. Includes Circulator.
Item#: 49650
Model#: 382200610
Brand: Weil-McLain
$4,179.00
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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
$6,574.00
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Floor/Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 299K BTU Gross Input, 280K BTU DOE Capacity, 243K BTU Net IBR Capacity. Includes Circulator.
Item#: 58492
Model#: 383900001
Brand: Weil-McLain
$8,804.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 72K BTU DOE Capacity, 63K BTU Net IBR Capacity. Includes Circulator.
Item#: 58576
Brand: Burnham
$4,266.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 96K BTU DOE Capacity, 83K BTU Net IBR Capacity. Includes Circulator.
Item#: 58578
Brand: Burnham
$4,687.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 136K BTU DOE Capacity, 118K BTU Net IBR Capacity. Includes Circulator.
Item#: 58580
Brand: Burnham
$5,385.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 210K BTU Gross Input, 194K BTU DOE Capacity, 169K BTU Net IBR Capacity. Includes Circulator.
Item#: 58582
Brand: Burnham
$6,021.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 285K BTU Gross Input, 262K BTU DOE Capacity, 228K BTU Net IBR Capacity. Includes Circulator.
Item#: 64872
Brand: Burnham
$8,255.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 399K BTU Gross Input, 377K BTU DOE Capacity, 328K BTU Net IBR Capacity.
Item#: 64873
Brand: Burnham
$10,699.00
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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.
Item#: 68714
Model#: ZWB35-3
Brand: Bosch Thermotechnology
$4,218.00
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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.
Item#: 68735
Model#: ZBR21-3
Brand: Bosch Thermotechnology
$3,069.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 71K BTU DOE Capacity, 62K BTU Net IBR Capacity. Includes Circulator.
Item#: 79374
Model#: 383500732
Brand: Weil-McLain
$3,721.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 71K BTU DOE Capacity, 62K BTU Net IBR Capacity. Includes Circulator.
Item#: 79375
Model#: 383500733
Brand: Weil-McLain
$3,721.00
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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
$5,568.00
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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.
Item#: 79380
Model#: 383500738
Brand: Weil-McLain
$9,534.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 102K BTU DOE Capacity, 89K BTU Net IBR Capacity. Includes Circulator.
Item#: 79460
Model#: PA110
Brand: Triangle Tube
$4,241.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 153K BTU Gross Input, 142K BTU DOE Capacity, 123K BTU Net IBR Capacity. Includes Circulator.
Item#: 79461
Model#: PA155
Brand: Triangle Tube
$5,255.00
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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.
Item#: 79462
Model#: PA250
Brand: Triangle Tube
$6,754.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 299K BTU Gross Input, 278K BTU DOE Capacity, 242K BTU Net IBR Capacity. Includes Circulator.
Item#: 79463
Model#: PA299
Brand: Triangle Tube
$8,245.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 399K BTU Gross Input, 379K BTU DOE Capacity, 330K BTU Net IBR Capacity.
Item#: 79464
Model#: PA399
Brand: Triangle Tube
$10,444.00
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Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 99K BTU DOE Capacity, 86K BTU Net IBR Capacity. Includes Circulator.
Item#: 79466
Model#: PEA110
Brand: Triangle Tube
$5,013.00
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Floor Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 750K BTU Gross Input, 702K BTU DOE Capacity, 610K BTU Net IBR Capacity.
Item#: 79525
Model#: 383600331
Brand: Weil-McLain
$17,455.00
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In-Stock