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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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DOE Heating Capacity (BTU)
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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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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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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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AFUE (%)
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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
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 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
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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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.
7% Buy This
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$2,159.00
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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
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$1,769.00
Only 2 In-Stock
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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.
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$1,865.00
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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.
4% Buy This
(9)
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$2,329.00
In-Stock
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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
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$2,009.00
Only 3 In-Stock
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Weil-McLain CGi-5-PIN - 102K BTU - 84.0% AFUE - Hot Water Gas Boiler - Power Vent
Model: 381359006
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 119k BTU Gross Input, 102k BTU DOE Capacity, 89k BTU Net IBR Capacity. Includes Circulator.
3% Buy This
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$2,459.99
Only 2 In-Stock
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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
(13)
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$2,099.00
In-Stock
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Crown Boiler Bermuda - 85K BTU - 82.0% AFUE - Steam Gas Boiler - Chimney Vent
Model: BSI138ENPZZPSU
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.
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$2,450.00
Factory-Direct
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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.
2% Buy This
(9)
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$2,239.00
Factory-Direct
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2% Check Discount
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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
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$5,099.00
Only 5 In-Stock
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2% Check Discount
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Weil-McLain EVG 399 - 383K BTU - 96.5% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900002
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
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$8,409.00
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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
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Weil-McLain CGa-4-PIDN - 85K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381359074
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.
2% Buy This
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$1,899.99
In-Stock
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Weil-McLain CGa-7-PIDN - 170K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381359080
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.
2% Buy This
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$3,061.00
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2% Check Discount
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Weil-McLain CGa-8-PIDN - 198K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 113081460
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 233k BTU Gross Input, 198k BTU DOE Capacity, 172k BTU Net IBR Capacity. Includes Circulator.
2% Buy This
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$3,139.99
In-Stock
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Weil-McLain Ultra 230 - 207K BTU - 94.1% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383500736
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.
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$4,199.00
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Buderus GC144/4 - 87K BTU - 85.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 7738503408
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 103K BTU Gross Input, 87K BTU DOE Capacity, 76K BTU Net IBR Capacity. Includes Circulator.
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$2,199.00
Backordered
Est. Ship Date Jan 19
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Triangle Tube Instinct - 102K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: INS110S
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 110K BTU Gross Input, 102K BTU DOE Capacity, 89K BTU Net IBR Capacity.
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$1,999.00
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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.
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$2,099.00
Only 3 In-Stock
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Weil-McLain CGa-3-PIDN - 56K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381359072
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.
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$1,820.62
In-Stock
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Weil-McLain CGa-6-PIDN - 141K BTU - 84.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: 381359078
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 166k BTU Gross Input, 141k BTU DOE Capacity, 123k BTU Net IBR Capacity. Includes Circulator.
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$2,579.09
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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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Weil-McLain ECO® Tec 199-H - 184K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900156
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 199K BTU Gross Input, 184K BTU DOE Capacity, 160K BTU Net IBR Capacity. Includes Circulator.
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$3,171.85
In-Stock
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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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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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Weil-McLain ECO® Tec 80-H - 75K BTU - 95% AFUE - Hot Water Gas Boiler - Direct Vent
Model: 383900153
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 74K BTU DOE Capacity, 64K BTU Net IBR Capacity. Includes Circulator.
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$2,452.80
Factory-Direct
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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
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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.
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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.
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$2,059.00
Only 2 In-Stock
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*This product qualifies for
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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
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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.
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