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Williamson-Thermoflo GSA-150 - 94K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent

Williamson-Thermoflo GSA-150 - 94K BTU - 82.9% AFUE - Steam Gas Boiler - Chimney Vent
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Model: GSA-150-N-IP
(Based on expert analysis, manufacturer ratings and customer reviews)
5.0 out of 55.0 out of 55.0 out of 55.0 out of 55.0 out of 5
Number of Reviews (3)
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$2,310.07
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  • Product Description
  • 3
    Reviews
  • 2
    Product Q&A
  • Recommended Accessories
  • How-To Articles
  • Manuals
Product Description
+
Features
Features
    "Uncover warm possibilities" with Williamson-Thermoflo's GSA gas fired steam boiler. The efficient GSA-150-N-IP pumps out 150,000 BTUs with an AFUE (annual fuel utilization efficiency) rating of 82.9 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.
  • 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.
Specifications
General Information
Product Line
GSA
Medium 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.
Steam
Heat Exchanger Material
Cast Iron
Fuel Type To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Natural Gas
Combustion Type
Conventional
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
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.
No
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. Learn More
Single Stage
Mount Type
Floor
Minimum Altitude
0 Feet
Maximum Altitude
2000 Feet
Assembly Type
Packaged
Performance
Maximum Input Capacity 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.
150000 BTU
DOE Heating Capacity 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.
125000 BTU
Net I=B=R Capacity 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.
94000 BTU
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. Learn More
82.9 %
Ultra Low NOx Emissions NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx. Learn More
No
Electrical Data
Voltage
120 Volts
Phase
1
Frequency
60 Hz
Dimensions
Flue Connection Size
6 Inches
Gas Connection Size
0.5 Inches
Supply Connection
3 Inches
Return Connection
2.5 Inches
Product Height
33.75 Inches
Product Width
21.5 Inches
Product Depth
27.625 Inches
Product Weight
505 Pounds
Warranty Information
Parts Warranty A warranty is a safeguard from defects in manufacturing and can vary in length and terms. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
1 Year
Heat Exchanger Warranty
10 Years
Features
Features
    "Uncover warm possibilities" with Williamson-Thermoflo's GSA gas fired steam boiler. The efficient GSA-150-N-IP pumps out 150,000 BTUs with an AFUE (annual fuel utilization efficiency) rating of 82.9 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.
  • 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.
Specifications
General Information
Product Line
GSA
Medium 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.
Steam
Heat Exchanger Material
Cast Iron
Fuel Type To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Natural Gas
Combustion Type
Conventional
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
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.
No
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. Learn More
Single Stage
Mount Type
Floor
Minimum Altitude
0 Feet
Maximum Altitude
2000 Feet
Assembly Type
Packaged
Performance
Maximum Input Capacity 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.
150000 BTU
DOE Heating Capacity 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.
125000 BTU
Net I=B=R Capacity 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.
94000 BTU
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. Learn More
82.9 %
Ultra Low NOx Emissions NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx. Learn More
No
Electrical Data
Voltage
120 Volts
Phase
1
Frequency
60 Hz
Dimensions
Flue Connection Size
6 Inches
Gas Connection Size
0.5 Inches
Supply Connection
3 Inches
Return Connection
2.5 Inches
Product Height
33.75 Inches
Product Width
21.5 Inches
Product Depth
27.625 Inches
Product Weight
505 Pounds
Warranty Information
Parts Warranty A warranty is a safeguard from defects in manufacturing and can vary in length and terms. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
1 Year
Heat Exchanger Warranty
10 Years
Product Specs
+
Specifications
General Information
Product Line
GSA
Medium 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.
Steam
Heat Exchanger Material
Cast Iron
Fuel Type To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Natural Gas
Combustion Type
Conventional
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
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.
No
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. Learn More
Single Stage
Mount Type
Floor
Minimum Altitude
0 Feet
Maximum Altitude
2000 Feet
Assembly Type
Packaged
Performance
Maximum Input Capacity 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.
150000 BTU
DOE Heating Capacity 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.
125000 BTU
Net I=B=R Capacity 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.
94000 BTU
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. Learn More
82.9 %
Ultra Low NOx Emissions NOx is a byproduct of the combustion process, and it's output is regulated in some jurisdictions. Many regulators mirror SCAQMD rules, which regulate air quality for some parts of Southern California. Ultra Low NOx appliances emit less than 10-14 ng/J (nanogram per Joule) of NOx. Learn More
No
Electrical Data
Voltage
120 Volts
Phase
1
Frequency
60 Hz
Dimensions
Flue Connection Size
6 Inches
Gas Connection Size
0.5 Inches
Supply Connection
3 Inches
Return Connection
2.5 Inches
Product Height
33.75 Inches
Product Width
21.5 Inches
Product Depth
27.625 Inches
Product Weight
505 Pounds
Warranty Information
Parts Warranty A warranty is a safeguard from defects in manufacturing and can vary in length and terms. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
1 Year
Heat Exchanger Warranty
10 Years
Reviews
(3)
+
Williamson-Thermoflo GSA-150-N-IP Reviews & Ratings
Product Q&A
(2)
+
Search Product Q&A's Answered by Bob, the Heating Product Expert
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Does this come with all of the attached items in the photo above? Such as LWC, sight glass and valves, motorized damper, high pressure limit, and gauge and the boiler drain.
Alan 
from Pennsylvania 
March 24, 2016
Answer
Yes, those parts are included with the boiler. For a full list of standard included equipment, please see the list at the bottom of page 2 of the brochure.
+
Do you offer an automatic water feed that can be plugged into the control unit of this boiler?
Andrew 
from New York 
October 04, 2015
Answer
The GSA-Series boilers do not include a water feeder, but you can certainly add the Hydrolevel VXT-24 water feeder.

Make sure your condensate return system is properly designed to avoid low water situations during normal operation. This could trick the automatic feeder into to overfilling the boiler.
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