Brand Name
BTU Input
BTU Output
Material
AFUE
Voltage
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Natural Gas Fired Cast Iron Water Boiler 90K BTU 84%

Williamsom-Thermoflo GWI-090-N-T-S3-W Cast Iron Natural Gas Fired Draft Induced Water Boiler, 84% AFUE, 90K BTU
    Factory tested
  • Easy service - 1-piece access door, all controls in easy reach
  • High efficiency - generous heating surface, automatic vent damper
  • Induced draft blower assembly
  • Cast iron sections with built-in air separator
  • Insulated heavy gauge steel jacket
  • Stainless steel burners
  • Electrical junction box
  • 24 VAC combination gas valve
  • Combination relay receptacle and 40 VA transformer and plug-in circulator relay
  • Taco 007 circulator pump
  • High temperature limit control
  • 30 psig ASME relief valve
  • Combination pressure temperature gauge
  • Limited lifetime warranty on heat exchanger, 1 year limited warranty on parts
  • Electronic ignition/flame supervisory control

    GWI-090-N-T-S3-W

Item#:
GWI-090-N-T-S3-W
Manufacturer Item:
GWI-090-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GW- Series-Manual_Misc

Natural Gas Fired Water Cast Iron Gas Boiler 91% AFUE 105K BTU

Williamsom-Thermoflo GWC-105 Cast Iron Sealed Combustion Natural Gas Fired Condensing Water Boiler, 91.2% AFUE, 105000 BTU
    Factory tested
  • PVC or stainless steel venting
  • Sealed combustion or direct exhaust venting
  • Multiple pass heat exchanger
  • Cast iron primary heat exchanger
  • Stainless steel secondary heat exchanger with air separator
  • Control module with indicator lights
  • Interred heat program providing automatic adjustment of boiler water temperature to match demand
  • Hot surface ignition system
  • Insulated heavy gauge steel jacket
  • Blower assembly with observation port
  • Electrical junction box
  • 30 psi ASME relief valve
  • Built-in bypass circulator system with sensor for temperature control
  • Negative regulation gas valve
  • Gas/air orifice plate for natural gas, separate plate provided with unit for conversion to propane
  • Water treatment inhibitor and test kit
  • 1/2" gas connection size, 1" minimum pipe size
  • 20 years cast iron heat exchanger warranty, 5 years stainless steel heat exchanger warranty, 2 years parts warranty for residential purpose

    GWC-105-N-T-S2-W

Item#:
GWC-105-N-T-S2-W
Manufacturer Item:
GWC-105-N-T-S2-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWC-105-N-T-S2-W_Install
GWC-105-N-T-S2-W_Spec

Natural Gas Fired Cast Iron Water Boiler 200K BTU 007

Williamsom-Thermoflo GWA-038-N-T-S3-W Natural Gas Fired Cast Iron Water Boiler 200 BTU Input 147K BTU Output 84%
    Natural or Propane
  • Factory tested
  • Easy service
  • One-piece access door
  • All controls in easy reach
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket
  • Low water cut-off,

    Williamson -ThermoFlo gwa-200-n-t-s3-w

    williamson -thermoflo gwa-200-n-t-s3-w

Item#:
GWA-200-N-T-S3-W
Manufacturer Item:
GWA-200-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWA-Series-Manual_Misc

Natural Gas Fired Cast Iron Water Boiler 166K BTU 007

Williamsom-Thermoflo GWA-038-N-T-S3-W Natural Gas Fired Cast Iron Water Boiler 166 BTU Input 122K BTU Output 84%
    Natural or Propane
  • Factory tested
  • Easy service
  • One-piece access door
  • All controls in easy reach
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket
  • Low water cut-off,

    GWA-166-N-T-S3-W

Item#:
GWA-166-N-T-S3-W
Manufacturer Item:
GWA-166-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWA-Series-Manual_Misc

Natural Gas Fired Cast Iron Water Boiler 133K BTU 007

Williamsom-Thermoflo GWA-038-N-T-S3-W Natural Gas Fired Cast Iron Water Boiler 133 BTU Input 98K BTU Output 84%
    Natural or Propane
  • Factory tested
  • Easy service
  • One-piece access door
  • All controls in easy reach
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket
  • Low water cut-off, Williamson -ThermoFlo gwa-133-n-t-s3-w

    williamson -thermoflo gwa-133-n-t-s3-w

Item#:
GWA-133-N-T-S3-W
Manufacturer Item:
GWA-133-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWA-Series-Manual_Misc

Natural Gas Fired Cast Iron Water Boiler 100K BTU 007

Williamsom-Thermoflo GWA-038-N-T-S3-W Natural Gas Fired Cast Iron Water Boiler 100 BTU Input 73K BTU Output 84%
    Natural or Propane
  • Factory tested
  • Easy service
  • One-piece access door
  • All controls in easy reach
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket
  • Low water cut-off, Williamson -ThermoFlo gwa-100-n-t-s3-w

    williamson -thermoflo gwa-100-n-t-s3-w

Item#:
GWA-100-N-T-S3-W
Manufacturer Item:
GWA-100-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWA-Series-Manual_Misc

Natural Gas Fired Cast Iron Water Boiler 68K BTU 007 84%

Williamsom-Thermoflo GWA-038-N-T-S3-W Natural Gas Fired Cast Iron Water Boiler 67K BTU Input 48K BTU Output 84%
    Natural or Propane
  • Factory tested
  • Easy service
  • One-piece access door
  • All controls in easy reach
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket
  • Low water cut-off, Williamson -ThermoFlo gwa-067-n-t-s3-w

    williamson -thermoflo gwa-067-n-t-s3-w

Item#:
GWA-067-N-T-S3-W
Manufacturer Item:
GWA-067-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWA-Series-Manual_Misc

Natural Gas Fired Cast Iron Water Boiler 38K BTU 007

Williamsom-Thermoflo GWA-038-N-T-S3-W Natural Gas Fired Cast Iron Water Boiler 38K BTU Input 27K BTU Output 84%
    Natural or Propane
  • Factory tested
  • Easy service
  • One-piece access door
  • All controls in easy reach
  • Cast iron sections with built-in air separator
  • Insulated heavy-gauge steel jacket
  • Low water cut-off,

    GWA-038-N-T-S3-W

Item#:
GWA-038-N-T-S3-W
Manufacturer Item:
GWA-038-N-T-S3-W
Manufacturer:
WILLIAMSON -THERMOFLO
 
GWA-Series-Manual_Misc

Natural Gas Fired Cast Iron Steam Boiler 200K BTU 82%

Williamsom-Thermoflo GSA-200-N-IP-S2 Cast Iron Natural Gas Fired Steam Boiler, 82.9% AFUE, 200K BTU
    Factory tested
  • Easy service - 1-piece access door, all controls in easy reach
  • High efficiency - generous heating surface, automatic vent damper
  • Rugged construction for long life, stainless steel burners, integral cast iron legs, integral draft diverter, insulated heavy gauge steel jacket, heavy gauge aluminized steel flue collector
  • 24 VAC combination gas valve
  • Gauge glass and guard assembly
  • Pressure gauge and siphon assembly
  • Pressure limit control
  • Probe low water cut-off
  • High temperature limit control
  • 15 psig ASME relief valve
  • Drain valve
  • Spark ignited (intermittent) pilot system, electronic ignition/flame supervisory control
  • 10 years limited warranty on boiler sections, 1 year limited warranty on parts
,

GSA-200-N-IP-S2

Item#:
GSA-200-N-IP-S2
Manufacturer Item:
GSA-200-N-IP-S2
Manufacturer:
WILLIAMSON -THERMOFLO
 
GSA-Series_Manual_Misc

Natural Gas Fired Cast Iron Steam Boiler 175K BTU 82%

Williamsom-Thermoflo GSA-100-N-IP Cast Iron Natural Gas Fired Steam Boiler, 82.9% AFUE, 175K BTU Input 109K BTU Output
    Factory tested
  • Easy service - 1-piece access door, all controls in easy reach
  • High efficiency - generous heating surface, automatic vent damper
  • Rugged construction for long life, stainless steel burners, integral cast iron legs, integral draft diverter, insulated heavy gauge steel jacket, heavy gauge aluminized steel flue collector
  • 24 VAC combination gas valve
  • Gauge glass and guard assembly
  • Pressure gauge and siphon assembly
  • Pressure limit control
  • Probe low water cut-off
  • High temperature limit control
  • 15 psig ASME relief valve
  • Drain valve
  • Spark ignited (intermittent) pilot system, electronic ignition/flame supervisory control
  • 10 years limited warranty on boiler sections, 1 year limited warranty on parts
,

GSA-175-N-IP-S2

Item#:
GSA-175-N-IP-S2
Manufacturer Item:
GSA-175-N-IP-S2
Manufacturer:
WILLIAMSON -THERMOFLO
 
GSA-Series_Manual_Misc

Natural Gas Fired Cast Iron Steam Boiler 150K BTU 82%

Williamsom-Thermoflo GSA-100-N-IP Cast Iron Natural Gas Fired Steam Boiler, 82.9% AFUE, 150K BTU Input 94K BTU Output
    Factory tested
  • Easy service - 1-piece access door, all controls in easy reach
  • High efficiency - generous heating surface, automatic vent damper
  • Rugged construction for long life, stainless steel burners, integral cast iron legs, integral draft diverter, insulated heavy gauge steel jacket, heavy gauge aluminized steel flue collector
  • 24 VAC combination gas valve
  • Gauge glass and guard assembly
  • Pressure gauge and siphon assembly
  • Pressure limit control
  • Probe low water cut-off
  • High temperature limit control
  • 15 psig ASME relief valve
  • Drain valve
  • Spark ignited (intermittent) pilot system, electronic ignition/flame supervisory control
  • 10 years limited warranty on boiler sections, 1 year limited warranty on parts
,

GSA-150-N-IP-S2

Item#:
GSA-150-N-IP-S2
Manufacturer Item:
GSA-150-N-IP-S2
Manufacturer:
WILLIAMSON -THERMOFLO
 
GSA-Series_Manual_Misc

Natural Gas Fired Cast Iron Steam Boiler 125K BTU 82%

Williamsom-Thermoflo GSA-100-N-IP Cast Iron Natural Gas Fired Steam Boiler, 82.9% AFUE, 125K BTU Input 78K BTU Output
    Factory tested
  • Easy service - 1-piece access door, all controls in easy reach
  • High efficiency - generous heating surface, automatic vent damper
  • Rugged construction for long life, stainless steel burners, integral cast iron legs, integral draft diverter, insulated heavy gauge steel jacket, heavy gauge aluminized steel flue collector
  • 24 VAC combination gas valve
  • Gauge glass and guard assembly
  • Pressure gauge and siphon assembly
  • Pressure limit control
  • Probe low water cut-off
  • High temperature limit control
  • 15 psig ASME relief valve
  • Drain valve
  • Spark ignited (intermittent) pilot system, electronic ignition/flame supervisory control
  • 10 years limited warranty on boiler sections, 1 year limited warranty on parts

    williamson -thermoflo gsa-125-n-ip-s2

Item#:
GSA-125-N-IP-S2
Manufacturer Item:
GSA-125-N-IP-S2
Manufacturer:
WILLIAMSON -THERMOFLO
 
GSA-Series_Manual_Misc
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