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Williamson-Thermoflo GWA-105-N-T-S2
Williamson-Thermoflo GWA-105-N-T-S2
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Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent

Model:

GWA-105-N-T-S2

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Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Model: GWA-105-N-T-S2
Product Discontinued
Accessories
Features
Specifications
Reviews
How-To Articles
Manuals

Recommended Accessories

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Expert Recommended Accessories Selected by Ken, our Expert
Optional Accessories 14
Backflow Preventer
$159.00
In-Stock
$1,628.19
In-Stock
Connection Type
$278.00
Only 4 In-Stock
Connection Type
$273.00
Only 4 In-Stock
$2,997.00
Only 1 In-Stock
$1,631.76
Factory-Direct
$1,823.90
In-Stock
$227.00
Factory-Direct
$101.00
Factory-Direct
$159.00
Factory-Direct
$237.95
Control Type
$3,355.38

Features

    "Uncover warm possibilities" with Williamson-Thermoflo's GWA Gas Water Atmospheric boiler. The highly efficient GWA-105-N-T-S2 pumps out 105,000 BTUs with an AFUE (annual fuel utilization efficiency) rating of 83.0 percent. The GWA is also equipped with flue baffles, stainless steel burners, and an automatic vent damper to maintain that efficiency. This factory-packaged boiler has many features; like a spark (intermittent) pilot system, cast-iron sections with built-in air separator, and an insulated heavy-gauge steel jacket. The GWA 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 lifetime warranty, you can be absolutely sure that your investment is reliable and built to last.
  • Factory Tested
  • GWA boilers are factory tested, ensuring reliability and properly functioning equipment.
  • Easy Service
  • Service is simple with a one-piece access door and easily accessible controls.
  • Inferred Heat Program
  • GWA is designed with an inferred heat program which provides automatic adjustment of the boiler water temperature to match heating demands.
  • Limited Lifetime Warranty
  • A limited lifetime warranty on the heat exchanger means that you can rest assured that your investment is covered, should there be a problem.
  • Product Includes
  • Taco 007 Circulator Pump
  • 1 Flange"

Specifications

GWA-105-N-T-S2
specs product image PID-31043
General Information
Product Line
GWA
Medium Learn More
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.
Hot Water
Heat Exchanger Material
Cast Iron
Fuel Type Learn More
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 Learn More
Combustion Type
Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.
Conventional
Vent Type Learn More
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 Learn More
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 Learn More
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
Includes Pump
Yes
Assembly Type
Packaged
Performance
AFUE Learn More
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
83 %
Maximum Input Capacity Learn More
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.
105000 BTU
DOE Heating Capacity Learn More
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.
88000 BTU
Net I=B=R Capacity Learn More
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.
77000 BTU
Ultra Low NOx Emissions Learn More
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
Phase
1
Frequency
60 Hz
Dimensions
Flue Connection Size
5 Inches
Gas Connection Size
1/2 Inch
Supply Connection
1 1/4 Inches
Return Connection
1 1/4 Inches
Product Height
54 3/8 Inches
Product Width
22 Inches
Product Depth
23 1/4 Inches
Product Weight
240 Pounds
Shipping Weight
250 Pounds
Warranty Information
Parts Warranty Learn More
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
1 Year
Heat Exchanger Warranty
Lifetime Years

Reviews

(14)
Williamson-Thermoflo GWA-105-N-T-S2 Reviews & Ratings
Customer Rating
4.71
(14 Ratings)
92% recommend this product
5
(10)
4
(4)
3
(0)
2
(0)
1
(0)
Ken, the eComfort Product Expert
Expert Recommended Review
Solid Cast-Iron Boiler
By Ken D. 
eComfort Product Expert
Review Posted 10/07/2016
The Williamson GWA is a tried-and-true cast iron boiler at a great price. You can expect all of the essential features: heavy-gauge steel jacket, cast iron sections with built-in air separator, stainless steel burners, automatic vent damper, high-limit temperature control with reset, ASME pressure relief valve, a combination temperature & pressure gauge and even a Taco 007 circulator.
Was this review helpful?
Rating Breakdown
Features
5/5
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Quality
5/5
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Performance
5/5
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Value
5/5
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Verified Buyer
Verified Buyer
Great price. Good service
By Richard L 
New York
Purchased 09/21/2018 | 
Review Posted 12/11/2018 
Easy to install. Quality item. Very quiet operation.
Richard L Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-210-N-T-S2.
Was this review helpful?
Rating Breakdown
Features
4/5
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Quality
4/5
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Performance
4/5
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Value
5/5
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Verified Buyer
Verified Buyer
Works fantastic
By Mark A 
East Moline, Illinois
Purchased 10/15/2018 | 
Review Posted 11/27/2018 
Had I local company install. Had all parts needed.
Mark A Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-140-N-T-S2.
Was this review helpful?
Rating Breakdown
Features
5/5
icon-review-marker
Quality
5/5
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Performance
5/5
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Value
5/5
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Pros:
Durable, Quiet, Price, I'd Buy It Again
Verified Buyer
Verified Buyer
Great boiler
By Robert C. 
Cleveland, Ohio
Purchased 03/10/2018 | 
Review Posted 04/05/2018 
Easy install
Robert C. Recommends This
Was this review helpful?
Rating Breakdown
Features
5/5
icon-review-marker
Quality
5/5
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Performance
5/5
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Value
5/5
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Pros:
Easy To Use, Price, Exceeded Expectations, High Quality
Verified Buyer
Verified Buyer
I gave a bad review before but I was wrong.
By Lexie R. 
Charmco, West Virginia
Purchased 11/03/2017 | 
Review Posted 01/13/2018 
When I reviewed before the unit had just been placed in service. Once the unit cycled for a while it began to work well. We experienced one of the coldest two weeks we had seen for many years. The coldest was nine below. The unit kept my home comfortable during the whole time. .
Lexie R. Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-175-L-T-S2.
Was this review helpful?
Rating Breakdown
Features
5/5
icon-review-marker
Quality
5/5
icon-review-marker
Performance
5/5
icon-review-marker
Value
5/5
icon-review-marker
Verified Buyer
Verified Buyer
Great Investment - Low Cost
By Norman B. 
Camp Hill, Pennsylvania
Purchased 11/13/2017 | 
Review Posted 12/05/2017 
Quick delivery and very well packaged. Small in size but heats home well. Could be better labeled to assist with installation
Norman B. Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-070-N-T-S2.
Was this review helpful?
Rating Breakdown
Features
5/5
icon-review-marker
Quality
5/5
icon-review-marker
Performance
5/5
icon-review-marker
Value
5/5
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Verified Buyer
Verified Buyer
Great Product
By Mark D. 
Morganfield, Kentucky
Purchased 02/02/2017 | 
Review Posted 02/24/2017 
Manuel was very informative and very easy to use.
Mark D. Recommends This
Was this review helpful?
Rating Breakdown
Features
4/5
icon-review-marker
Quality
4/5
icon-review-marker
Performance
4/5
icon-review-marker
Value
5/5
icon-review-marker
Pros:
Easy To Use, Quiet, I'd Buy It Again
Verified Buyer
Verified Buyer
Good Heater
By SIlvestro M. 
Vincentown, New Jersey
Purchased 12/05/2016 | 
Review Posted 01/16/2017 
Works well, and easy installation, thank you.
SIlvestro M. Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-052-N-T-S2.
Was this review helpful?
Rating Breakdown
Features
5/5
icon-review-marker
Quality
5/5
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Performance
5/5
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Value
5/5
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Verified Buyer
Verified Buyer
Great service from Ecomfort , SLOW shipping company
By Dan M. 
Olympia, Washington
Purchased 11/15/2016 | 
Review Posted 12/11/2016 
As usual, the professionals at EComfort were GREAT! They helped me determine the best replacement unit for my heat-load requirements and processed the order the same day.

Three weeks later, I got a call from the trucking company telling me when the boiler was to arrive (Clearly this shipper doesn't expedite like Amazon). The boiler arrived in good condition and was an easy install.

The unit has been running now for almost a week in 32 degree outdoor temps and the office building is warm again.
Dan M. Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-052-N-T-S2.
Was this review helpful?
Expert Response
We're very sorry this took so long to get to you. That's an exceptionally long time to wait, and we apologize.
Ken, the eComfort Product Expert
Ken D.
eComfort Product Expert
Rating Breakdown
Features
4/5
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Quality
4/5
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Performance
4/5
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Value
4/5
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Verified Buyer
Verified Buyer
Very nice unit. Installed easily, fired right up.
By Dave B. 
Springville, New York
Purchased 10/14/2016 | 
Review Posted 11/07/2016 
At this time we are happy with the unit. Hopefully it continues to operate as well. Time is the determining factor with this type of product.
Dave B. Recommends This
What's a Related Review? Learn More
Related Reviews
*Related reviews were originally written for products that are very similar to this one. While the reviewed product may differ in color, size, fuel type, or another aspect, we believe it is applicable to this model.
This review was originally written for the GWA-105-L-T-S2.
Was this review helpful?
Rating Breakdown
Features
4/5
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Quality
4/5
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Performance
4/5
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Value
5/5
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Verified Buyer
Verified Buyer
Boiler
By Melchor M. 
spring valley, New York
Purchased 04/27/2016 | 
Review Posted 06/20/2016 
Hello! So far i didn't install yet because i'm still waiting my cousin to do the soldering. I'll let you know when we finish so i can give you review.Thanks.
Melchor M. Recommends This
Was this review helpful?
Rating Breakdown
Features
5/5
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Quality
5/5
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Performance
5/5
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Value
5/5
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Manuals

 
Media Gallery
Williamson-Thermoflo GWA-105 - 88K BTU - 83.0% AFUE - Hot Water Gas Boiler - Chimney Vent
Williamson-Thermoflo GWA-105-N-T-S2
Customer Review Images