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Williamson-Thermoflo Boilers

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Williamson-Thermoflo offers a wide selection of boilers in a variety of fuel types, mediums, and vent types to fit all of your needs. Shop our selection and find your new Williamson-Thermoflo boiler here.
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Model Number GSA-150-N-IP is the Number 1 Seller
Learn More About GSA-150-N-IP
Model GSA-150-N-IP is a Recommended Product
Williamson-Thermoflo GSA-150 - 94K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-150-N-IP
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 150K BTU Gross Input, 125K BTU DOE Capacity, 94K BTU Net IBR Capacity.
17% 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 (2)
$2,549.00
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Model Number GWA-070-N-T-S2 is the Number 2 Seller
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.
13% 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&A (6)
$1,599.00
Factory-Direct
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Model Number GWA-105-N-T-S2 is the Number 3 Seller
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.
8% 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&A (5)
$1,759.00
Backordered
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Est. Ship Date Oct 31
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Backorder
Model Number GWA-210-N-T-S2 is the Number 4 Seller
Learn More About GWA-210-N-T-S2
Model GWA-210-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-210 - 175K BTU - 82.4% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-210-N-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 210K BTU Gross Input, 175K BTU DOE Capacity, 151K BTU Net IBR Capacity. Includes Circulator.
8% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$2,469.00
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Model Number GSA-200-N-IP is the Number 5 Seller
Learn More About GSA-200-N-IP
Model GSA-200-N-IP is a Recommended Product
Williamson-Thermoflo GSA-200 - 125K BTU - 82.8% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-200-N-IP
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.
8% 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 (2)
$3,115.00
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Learn More About GSA-250-N-IP
Model GSA-250-N-IP is a Recommended Product
Williamson-Thermoflo GSA-250 - 157K BTU - 83.0% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-250-N-IP
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 250K BTU Gross Input, 209K BTU DOE Capacity, 157K BTU Net IBR Capacity.
8% 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 (2)
$3,479.00
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Learn More About GWA-140-N-T-S2
Model GWA-140-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-140 - 117K BTU - 82.5% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-140-N-T-S2
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.
4% 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&A (5)
$1,999.00
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Learn More About GWA-070-L-T-S2
Model GWA-070-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-070 - 58K BTU - 83.0% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-070-L-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.
4% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$1,599.00
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Learn More About GWA-140-L-T-S2
Model GWA-140-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-140 - 117K BTU - 82.5% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-140-L-T-S2
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.
4% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$1,979.00
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Learn More About GWA-210-L-T-S2
Model GWA-210-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-210 - 175K BTU - 82.4% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-210-L-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 210K BTU Gross Input, 175K BTU DOE Capacity, 151K BTU Net IBR Capacity. Includes Circulator.
4% Buy This
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$2,469.00
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Learn More About GSA-300-N-IP
Model GSA-300-N-IP is a Recommended Product
Williamson-Thermoflo GSA-300 - 180K BTU - 82.4% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-300-N-IP
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Disassembled. Ratings: 299K BTU Gross Input, 247K BTU DOE Capacity, 180K 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(5)
Q&A (2)
$3,935.00
Factory-Direct
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Learn More About GSA-125-N-IP
Williamson-Thermoflo GSA-125 - 78K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-125-N-IP
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 125K BTU Gross Input, 104K BTU DOE Capacity, 78K 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(3)
Q&A (2)
$2,425.00
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Learn More About GWI-063-L-T-S2
Williamson-Thermoflo GWI-063 - 53K BTU - 83.3% AFUE - Hot Water Propane Boiler - Power Vent
Model: GWI-063-L-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 63K BTU Gross Input, 53K BTU DOE Capacity, 46K BTU Net IBR Capacity. Includes Circulator.
4% Buy This
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$2,025.00
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Learn More About OWT-3-T-S2-W-W
Williamson-Thermoflo OWT-3 - 114K BTU - 85.0% AFUE - Hot Water Oil Boiler - Chimney Vent - Burner Sold Separately
Model: OWT-3-T-S2-W-W
Floor Mounted, Cast Iron Boiler. Ships Packaged. Ratings: 0.95 GPH Gross Input, 114K BTU DOE Capacity, 99K BTU Net IBR Capacity. Includes Circulator.
4% Buy This
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$2,079.00
Only 1 In-Stock
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Learn More About OSB-4-P-S2-W-W
Williamson-Thermoflo OSB-4 - 108K BTU - 84.0% AFUE - Steam Oil Boiler - Chimney Vent - Burner Sold Separately
Model: OSB-4-P-S2-W-W
Floor Mounted, Cast Iron Boiler. Ships Disassembled. Ratings: 1.20 GPH Gross Input, 144K BTU DOE Capacity, 108K BTU Net IBR Capacity.
4% Buy This
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Q&A (2)
$2,499.00
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Learn More About GWA-245-N-T-S2
Model GWA-245-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-245 - 202K BTU - 82.2% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-245-N-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 245K BTU Gross Input, 202K BTU DOE Capacity, 176K BTU Net IBR Capacity. Includes Circulator.
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$2,599.00
Was 
$2,699.00
SAVE $100.00
Only 2 In-Stock
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Learn More About GWA-052-L-T-S2
Model GWA-052-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-052 - 43K BTU - 83.0% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-052-L-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.
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$1,569.00
Only 1 In-Stock
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Learn More About GWA-245-L-T-S2
Model GWA-245-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-245 - 202K BTU - 82.2% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-245-L-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 245K BTU Gross Input, 202K BTU DOE Capacity, 176K BTU Net IBR Capacity. Includes Circulator.
4.7 out of 54.7 out of 54.7 out of 54.7 out of 54.7 out of 5(13)
Q&A (5)
$2,699.00
Factory-Direct
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Learn More About GSA-075-N-IP
Model GSA-075-N-IP is a Recommended Product
Williamson-Thermoflo GSA-075 - 47K BTU - 83.0% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-075-N-IP
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 75K BTU Gross Input, 62K BTU DOE Capacity, 47K BTU Net IBR Capacity.
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(5)
Q&A (2)
$1,899.00
Was 
$2,215.00
SAVE $316.00
Only 2 In-Stock
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Learn More About FS-120 COMBI
Williamson-Thermoflo FS-120 - 109K BTU - 92.2% AFUE - Combi Gas Boiler - Direct Vent
Model: FS-120 COMBI
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 109K BTU DOE Capacity, 94K BTU Net IBR Capacity. Includes Circulator.
3.0 out of 53.0 out of 53.0 out of 53.0 out of 53.0 out of 5(2)
Q&A (2)
$2,339.00
Was 
$2,439.00
SAVE $100.00
Only 3 In-Stock
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Learn More About GWC-140-N-T-S2
Williamson-Thermoflo GWC-140 - 130K BTU - 91.4% AFUE - Hot Water Gas Boiler - Direct Vent
Model: GWC-140-N-T-S2
Floor Mounted, Condensing Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 140K BTU Gross Input, 130K BTU DOE Capacity, 113K BTU Net IBR Capacity. Includes Circulator.
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
Q&A (1)
$4,029.00
Factory-Direct
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Learn More About FS-120
Williamson-Thermoflo FS-120 - 109K BTU - 92.4% AFUE - Hot Water Gas Boiler - Direct Vent
Model: FS-120
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 120K BTU Gross Input, 109K BTU DOE Capacity, 95K BTU Net IBR Capacity.
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
Q&A (1)
$2,129.00
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Learn More About FS-80 COMBI
Williamson-Thermoflo FS-80 - 73K BTU - 92.4% AFUE - Combi Gas Boiler - Direct Vent
Model: FS-80 COMBI
Wall Mounted, Condensing Boiler with Modulating Gas Valve. Ships Packaged. Ratings: 80K BTU Gross Input, 73K BTU DOE Capacity, 63K BTU Net IBR Capacity. Includes Circulator.
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5(1)
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Learn More About GWC-070-N-T-S2
Williamson-Thermoflo GWC-070 - 65K BTU - 91.9% AFUE - Hot Water Gas Boiler - Direct Vent
Model: GWC-070-N-T-S2
Floor Mounted, 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.
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$3,259.00
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.
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