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Natural gas steam boilers are one of the most common types of boilers used in America. Find your new natural gas steam boiler from our wide selection today.
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Net I=B=R Capacity (BTU)
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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)
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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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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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81 (25)
82 (55)
83 (6)
Efficiency (%)
77 (3)
82 (3)
Vent Type
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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.
Chimney Vent (88)
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Bermuda (17)
EG (15)
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DHW Production
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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.
Available (11)
No (75)
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Weil-McLain EG-45-S-PIDN - 94K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118454300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 150K BTU Gross Input, 125K BTU DOE Capacity, 94K BTU Net IBR Capacity.
14% Buy This
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$3,128.40
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Burnham IN5 - 86K BTU - 82.0% AFUE - Steam Gas Boiler - Chimney Vent - Packaged with Trim
Model: PIN5SNI-ME2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 115K BTU DOE Capacity, 86K BTU Net IBR Capacity.
9% Buy This
(2)
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$3,199.00
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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.
9% Buy This
(1)
$2,450.00
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Crown Boiler Bermuda - 149K BTU - 82.2% AFUE - Steam Gas Boiler - Chimney Vent
Model: BSI241ENPZZPSU
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 241K BTU Gross Input, 199K BTU DOE Capacity, 149K BTU Net IBR Capacity.
9% Buy This
(1)
$3,249.05
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Burnham IN4PVNI - 65K BTU - 82.2% AFUE - Steam Gas Boiler - Power Vent - Packaged with Trim
Model: IN4PVNI-M2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 105K BTU Gross Input, 87K BTU DOE Capacity, 65K BTU Net IBR Capacity.
9% Buy This
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$2,962.00
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Burnham IN6 - 108K BTU - 82.1% AFUE - Steam Gas Boiler - Chimney Vent - Packaged with Trim
Model: PIN6SNI-ME2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 144K BTU DOE Capacity, 108K BTU Net IBR Capacity.
5% Buy This
(3)
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$3,599.00
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2% Check Discount
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Weil-McLain EG-65-S-PIDN - 157K BTU - 83.0% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118654300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 250K BTU Gross Input, 209K BTU DOE Capacity, 157K BTU Net IBR Capacity.
5% Buy This
(2)
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$4,192.20
Only 1 In-Stock
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Weil-McLain EG-75-S-PIDN - 185K BTU - 82.4% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118754300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 299K BTU Gross Input, 247K BTU DOE Capacity, 185K BTU Net IBR Capacity.
5% Buy This
(2)
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$4,239.95
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Crown Boiler Bermuda - 43K BTU - 81.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: BSI069ENPZZPSU
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 69K BTU Gross Input, 57K BTU DOE Capacity, 43K BTU Net IBR Capacity.
5% Buy This
(1)
$2,099.99
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2% Check Discount
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Crown Boiler Bermuda - 64K BTU - 82.0% AFUE - Steam Gas Boiler - Chimney Vent
Model: BSI103ENPZZPSU
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.
5% Buy This
(1)
$2,300.00
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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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Crown Boiler Bermuda - 107K BTU - 82.1% AFUE - Steam Gas Boiler - Chimney Vent
Model: BSI172ENPZZPSU
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.
5% Buy This
(1)
$3,100.00
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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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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 EG-35-S-PIDN - 62K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118354300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 100K BTU Gross Input, 83K BTU DOE Capacity, 62K BTU Net IBR Capacity.
5% Buy This
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$2,560.51
Only 1 In-Stock
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2% Check Discount
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Weil-McLain EG-75-S-PIDN-T - 185K BTU - 82.4% AFUE - Steam Gas Boiler - Chimney Vent - With Tankless Opening
Model: 118755300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 299K BTU Gross Input, 247K BTU DOE Capacity, 185K BTU Net IBR Capacity.
5% Buy This
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(2)
$4,609.80
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Weil-McLain PEG-55-S-PIDN - 125K BTU - 82.8% AFUE - Steam Gas Boiler - Chimney Vent
Model: 119554325
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 200K BTU Gross Input, 167K BTU DOE Capacity, 125K BTU Net IBR Capacity.
5% Buy This
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$3,744.03
Only 2 In-Stock
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ProSelect® Force™ Boilers - 128k BTU - 82.1% AFUE - Steam Gas Boiler - Chimney Vent
Model: FORCESTEAM07NH
Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 207K BTU Maximum Input Capacity, 171K BTU DOE Capacity, 128K BTU Net IBR Capacity.
5% Buy This
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$2,535.05
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2% Check Discount
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Crown Boiler Bermuda - 107K BTU - 82.1% AFUE - Steam Gas Boiler - Chimney Vent - 2,000 to 7,000 Ft. Altitude
Model: BSI172ENPZZP7U
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.
5% Buy This
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$3,025.92
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Burnham IN4 - 65K BTU - 82.0% AFUE - Steam Gas Boiler - Chimney Vent - Trim Sold Separately
Model: KIN4LNI-LE2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 105K BTU Gross Input, 87K BTU DOE Capacity, 65K BTU Net IBR Capacity.
(4)
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$2,379.00
Only 1 In-Stock
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2% Check Discount
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Burnham IN6 - 108K BTU - 82.1% AFUE - Steam Gas Boiler - Chimney Vent - Trim Sold Separately
Model: KIN6LNI-LE2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 175K BTU Gross Input, 144K BTU DOE Capacity, 108K BTU Net IBR Capacity.
(4)
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(2)
$3,899.00
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2% Check Discount
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Weil-McLain EG-55-S-PIDN-T - 125K BTU - 82.8% AFUE - Steam Gas Boiler - Chimney Vent - With Tankless Opening
Model: 118555300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 200K BTU Gross Input, 167K BTU DOE Capacity, 125K BTU Net IBR Capacity.
(1)
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(1)
$3,926.71
Only 1 In-Stock
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Crown Boiler Bermuda - 180K BTU - 77.5% Thermal Efficiency - Steam Gas Boiler - Chimney Vent
Model: BSI311ENPZZPSU
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 310K BTU Gross Input, 240K BTU DOE Capacity, 180K BTU Net IBR Capacity.
(1)
$4,127.89
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2% Check Discount
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Weil-McLain EG-40-S-PIDN - 78K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118404300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 125K BTU Gross Input, 104K BTU DOE Capacity, 78K BTU Net IBR Capacity.
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$2,923.27
Only 1 In-Stock
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Weil-McLain EG-50-S-PIDN - 109K BTU - 82.8% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118504300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 175K BTU Gross Input, 145K BTU DOE Capacity, 109K BTU Net IBR Capacity.
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$3,357.91
Only 1 In-Stock
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2% Check Discount
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Weil-McLain EG-50-S-PIDN-T - 109K BTU - 82.8% AFUE - Steam Gas Boiler - Chimney Vent - With Tankless Opening
Model: 118505300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 175K BTU Gross Input, 145K BTU DOE Capacity, 109K BTU Net IBR Capacity.
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$3,654.91
Only 1 In-Stock
Free Shipping & Lift Gate
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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
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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 EG-55-S-PIDN - 125K BTU - 82.8% AFUE - Steam Gas Boiler - Chimney Vent
Model: 118554300
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 200K BTU Gross Input, 167K BTU DOE Capacity, 125K BTU Net IBR Capacity.
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(2)
$3,629.71
Only 1 In-Stock
Free Shipping & Lift Gate
×
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
×
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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