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Williamson-Thermoflo GSA-250-N-IP GSA - 250,000 BTU - Steam Boiler - NG - 83% AFUE - Chimney Vented - Up to 2,000 Ft.

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Product Specifications
General Information
Product Line
Fuel Type
Natural Gas
Combustion Type
DHW Production
Single Stage
Mount Type
Minimum Altitude (Feet)
0 Feet
Maximum Altitude (Feet)
2000 Feet
Assembly Type
Maximum Input Capacity (BTU)
250000 BTU
DOE Heating Capacity (BTU)
209000 BTU
Net I=B=R Capacity (BTU)
157000 BTU
Efficiency (%)
83 %
Electrical Data
Voltage (Volts)
120 Volts
Frequency (Hertz)
60 Hertz
Supply Connection (Inches)
3 Inches
Return Connection (Inches)
2.5 Inches
Product Height (Inches)
41.875 Inches
Product Width (Inches)
41.5 Inches
Product Depth (Inches)
39.375 Inches
Product Weight (Pounds)
660 Pounds
Warranty Information
Parts Warranty (Years)
1 Year
Heat Exchanger Warranty (Years)
10 Years
Buying Guides
Model: GSA-250-N-IP
Allow 7-14 Business Days
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"Uncover warm possibilities" with Williamson-Thermoflo's GSA gas fired steam boiler. The highly efficient GSA-250-N-IP pumps out 250,000 BTUs with an AFUE (annual fuel utilization efficiency) rating of 83.0 percent. The GSA is also designed with a generous heating surface and an automatic vent damper to maintain that efficiency. This factory-packaged boiler is equipped with many features, such as a spark (intermittent) pilot system, cast-iron sections, and an insulated heavy-gauge steel jacket. The GSA is also easily serviced with all controls in reach and a one-piece access door. Since it is factory tested and comes with a limited 10 year warranty on boiler sections, you can be absolutely sure that your investment is reliable and built to last.

Product Features

Factory Tested
Every single GSA boiler is factory tested, ensuring reliability and properly functioning equipment.

Factory Packaged
GSA boilers are factory packaged meaning that the boiler comes to you with cast iron sections and the boiler assembled and ready for installation.

Easy Service
Service is simple with a one-piece access door and easily accessible controls.

10 Year Warranty
A limited 10 year warranty on boiler parts means that you can rest assured that your investment is covered, should there be a problem.

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Williamson-Thermoflo GSA-250-N-IP Reviews & Ratings
1 Review  Sort by 
Mircea Ionescu
Purchased from eComfort
Total Reviews
8 Reviews
5 out of 55 out of 55 out of 55 out of 55 out of 5
Williamson-thermoflo Gsa - 250,000 Btu - Steam Boiler - Ng - 83% Afue - Chimney Vented - Up To 2,000 Ft. Review
Built by a division of weil Mc Lean the boiler it is similar to their products.Seems to be build well and I hope to have years of trouble free working status.A little difficult to install given the position of the ports.I will recomand this product to others.
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