Williamson-Thermoflo GWA140NS

GWA-140NS Standing Pilot Cast Iron Gas Boiler 80.4% - 140,000 BTU

Connect With Us800-299-9470

Log In My Account My Cart0
Remodel Your Home For Less Financing

Click to Enlarge
Click to Enlarge
View and share related images
View similar products
Model #:

Williamson-Thermoflo GWA140NS

Williamson-Thermoflo GWA-140NS Standing Pilot Cast Iron Gas Boiler 80.4% - 140,000 BTU
Rating: (Write a Review)
This product is currently unavailable.

Payment Options Why Buy From Us

Customers Also Viewed: Back To Top ↑

View More »

Williamson-Thermoflo Products
Quick Specs:
Brand: Williamson-Thermoflo
Stock Id: SID291187
Fuel Type: Natural Gas or Propane
Width: 16"
Height: 28"
Depth: 23"
Energy Star: No
Volts: 115 Volts
Technical Details
Construction: Cast Iron
Weight (lbs): 280
BTU Output: 112,800
BTU Input: 140000
Vent Material: 26 ga. galvanized pipe
Vent Type: Chimney
Vent Size: 6"
Gas Connection: 1/2"
Modulating: No
Heat Exchanger Type: Cast Iron
Maximin Fuze Size (Amp): 15
Water Supply/Return Connections: 1-1/4"
Boiler Pump Included: No
Outdoor Sensor Included: No
Efficiency AFUE (%): 80.4
Wall Hung: No

The Williamson-Thermoflo GWA series boilers are almost identical to the Weil-McLain CGa series boilers. The Williamson-Thermoflo GWA series boiler are chimney vented and can used with natural or propane gas. They are designed to be used with all kind of radiators and radiant floor heating systems. Thanks to the durable cast iron sections the GWA series boilers are proven to last for decades. The GWA series boilers are made for most residential applications and with sizes from 52,000-245,000 BTUs we have the right unit for you.


  • One-piece access door.
  • Insulated Extended Steel Jacket.
  • Cast Iron Section s w ith Built-in Air Separator.
  • Circulator & Near Boiler Piping.
  • Pressure Temperature Gauge.
  • Safety Relief Valve.
  • Drain Valve.
  • High Limit.
  • Circulator Pump Relay.
  • Transformer and Junction Box.
  • Automatic Vent Damper.
  • 120V Power switch
  • 100% Shut-off Combination.
  • Non-Linting Pilot Burner.
  • Stainless Steel Burners.
  • Vertical Drafthood
  • Blocked Vent Limit Switch.
  • Flame Roll-Out Switch
  • Factory tested.
  • Product Warranty
  • 1 year parts / Limited lifetime heat exchanger


  • BTU Input: 140000
  • BTU Output: 112,800
  • Efficiency AFUE (%): 80.4
  • Application: GWA-140NS
  • Fuel Type: Natural Gas or Propane
  • Heat Exchanger Type: Cast Iron
  • Vent Size: 6"
  • Vent Material: 26 ga. galvanized pipe
  • Vent Type: Chimney
  • Wall Hung: No
  • Voltage: 115V
  • Height: 28"
  • Width: 16"
  • Depth: 23"

Williamson-Thermoflo GWA140NS Reviews & Ratings

5 Star:
0 Reviews
4 Star:
0 Reviews
3 Star:
0 Reviews
2 Star:
0 Reviews
1 Star:
0 Reviews
Share your thoughts with other customers:

McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

PriceGrabber User Ratings for AppliancesConnection.com Customer Certified by Bizrate NARI - National Association of the Remodeling Industry NKBA - National Kitchen and Bath Association
Inc. 500 Seal Security Verified Seal AppliancesConnection.com is upfront North American Home Furnishings Association Inc. 500 Nextag Seller K+BB Online