Williamson-Thermoflo GWA140NS

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

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Williamson-Thermoflo Products
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Williamson-Thermoflo GWA140NS

Williamson-Thermoflo GWA-140NS Standing Pilot Cast Iron Gas Boiler 80.4% - 140,000 BTU
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Today's Price: $2,199.00
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Condition:Brand New Factory Sealed With 1 Year USA Warranty
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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"

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