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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 GWA-105-N-T-S2 is the Number 1 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.
50% 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)
$1,599.00
Factory-Direct
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Model Number GSA-075-N-IP is the Number 2 Seller
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.
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)
$1,869.00
Was 
$2,215.00
SAVE $346.00
Only 1 In-Stock
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Model Number GSA-200-N-IP is the Number 3 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.
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)
$3,115.00
Only 1 In-Stock
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Model Number OWT-3-T-S2-W-W is the Number 4 Seller
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.
17% Buy This
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$2,079.00
Only 1 In-Stock
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Learn More About GWA-175-N-T-S2
Model GWA-175-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-175 - 145K BTU - 82.2% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-175-N-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 145K BTU DOE Capacity, 126K 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)
$2,259.00
Only 1 In-Stock
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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)
$2,399.00
Was 
$2,699.00
SAVE $300.00
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)
$2,289.00
Was 
$2,439.00
SAVE $150.00
Only 3 In-Stock
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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)
Q&A (2)
$2,189.00
Was 
$2,339.00
SAVE $150.00
Only 2 In-Stock
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Learn More About GWI-047-L-T-S2
Williamson-Thermoflo GWI-047 - 40K BTU - 83.0% AFUE - Hot Water Propane Boiler - Power Vent
Model: GWI-047-L-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 48K BTU Gross Input, 40K BTU DOE Capacity, 35K BTU Net IBR Capacity. Includes Circulator.
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$1,649.00
Was 
$1,899.00
SAVE $250.00
Only 2 In-Stock
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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.
67% 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
Backordered
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Est. Ship Date Jan 05
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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.
50% 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
Backordered
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Est. Ship Date Jan 05
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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.
33% 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
Backordered
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Est. Ship Date Jan 05
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Learn More About GWA-052-N-T-S2
Model GWA-052-N-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-052 - 43K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-052-N-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.
17% 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)
$1,469.00
Backordered
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Est. Ship Date Jan 05
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2% Check Discount
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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.
17% 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)
$1,569.00
Backordered
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Est. Ship Date Jan 03
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Learn More About GWA-105-L-T-S2
Model GWA-105-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-105-L-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.
17% 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)
$1,759.00
Backordered
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Est. Ship Date Jan 05
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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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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.
17% 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
Backordered
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Est. Ship Date Jan 05
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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.
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)
$3,479.00
Backordered
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Est. Ship Date Jan 05
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Learn More About OWB-3-T-S2-W
Williamson-Thermoflo OWB-3 - 114K BTU - 85.0% AFUE - Hot Water Oil Boiler - Chimney Vent - Burner Sold Separately
Model: OWB-3-T-S2-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.
17% Buy This
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$1,899.00
Backordered
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Est. Ship Date Jan 05
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2% Check Discount
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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.
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
Backordered
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Est. Ship Date Jan 05
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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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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.
4.7 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
Backordered
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Est. Ship Date Jan 05
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Free Shipping & Lift Gate
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Learn More About GWA-175-L-T-S2
Model GWA-175-L-T-S2 is a Recommended Product
Williamson-Thermoflo GWA-175 - 145K BTU - 82.2% AFUE - Hot Water Propane Boiler - Chimney Vent
Model: GWA-175-L-T-S2
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 175K BTU Gross Input, 145K BTU DOE Capacity, 126K 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)
$2,259.00
Backordered
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Est. Ship Date Jan 05
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Free Shipping & Lift Gate
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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.
4.7 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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Est. Ship Date Jan 05
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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
Backordered
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Est. Ship Date Jan 05
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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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Learn More About GSA-100-N-IP
Model GSA-100-N-IP is a Recommended Product
Williamson-Thermoflo GSA-100 - 62K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
Model: GSA-100-N-IP
Floor Mounted, Cast Iron Boiler with Single Stage Gas Valve. Ships Packaged. Ratings: 100K BTU Gross Input, 83K BTU DOE Capacity, 62K 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)
$2,285.00
Backordered
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Est. Ship Date Jan 05
Freight Icon
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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