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FA Series: Separated Combustion Unit Heater

Unit Heaters

UH Series
FA Series


UH – Separated Combustion Unit Heater (low profile)

FA – Separated Combustion Unit Heater

FA Series: Separated Combustion Unit Heater

The FA Series line of gas-fired, tubular exchanger, induced draft, hot air heaters are now available for use in commercial, industrial and agricultural applications.  This line of heaters features a traditional design with a durable, powder-coated black enamel exterior and stainless steel louvers for an exceptional aesthetic appeal, and a swept-wing impeller with finger-proof fan guards for low noise operation.

Additional features include operational troubleshooting lights and various mounting options.  The FA Series offers an out-of-the-box separated or power-vented combustion option.


  • BTU range of 100,000 to 250,000.
  • Traditional profile design with durable, powder-coated black enamel.
  • Aluminized steel tubular heat exchangers.
  • Stainless steel discharge louvers.
  • Swept wing air propeller, for noise reduction.
  • Finger proof fan guards are standard.
  • External operational indicator lights are standard.
  • External thermostatic connection.
  • 100 MBH and 125 MBH models can be rotated 180°.
  • Approved separated combustion can be field converted to power vented without additional parts or cost.


Typical Applications

The FA Series unit heater
is ideal for a multitude of
  • Greenhouses
  • Service Garages
  • Warehouse Spaces
  • Manufacturing Facilities
  • Check-in/out Areas
  • Vestibules
  • Work Stations
  • Entrance Ways
  • Sport or Total Building Heat


  • Input Range: 100,000 to 250,000.
  • Gas Type: Natural or propane.
  • Voltage: 120/60Hz VAC (primary); 24 VAC (thermostatic) – Single phase.
  • Vent Length: 3-ft. to 40-ft.
  • Average air temperature rise: 50ºF
  • Certification: ANSI Z83.8/CSA 2.6, commercial and industrial use, indoor use only.
  • Limited Warranty: 1 year components, 3 years exchangers, 5 years burner(s). Extension available.


  • 120/60 Hz. VAC (primary)
  • 24 VAC (thermostatic)
  • Single phase
  • NG: 3.5″ W.C.
  • LP: 10.0″ W.C.
  • NG: 5.0″ to 14.0″ W.C.
  • LP: 11.0 to 14.0″ W.C.
  • FA-100-200: 1/2″ N.P.T.
  • FA-225-250: 3/4″ N.P.T.
  • Field connect to valve.
  • Non-reversible horizontal mounting.
  • Mounted with (4x)-3/8″-16 threaded inserts.
  • Category I or III venting.
  • Rear, horiz. discharge/inlet.
  • ANSI Z83.8/CSA 2.6
  • Commercial/Industrial use
  • Indoor use only
  • External indicator lights
  • External thermostatic connection
  • Approved for elevations 0 – 2,000 ft without modifications
  • Supplied standard as separated combustion
Input Range:
100,000 to 250,000 BTU/h
Gas Type:
Natural or Propane
Control Housing: Powder-coated Black Enamel
Heat Exchangers: Tubular Aluminzed Steel
Certification: ETL Listed North America
Limited Warranty: 1-3-5 (Components-Exchangers-Burner)
24V Controls: Thermostat Connection
Indicator Lights: Standard


Available FA Series Models: FA-100, FA-125, FA-150, FA-175, FA-200, FA-225, FA-250



FA-Unit-Heater-Dimensions 2Specify natural (N) or propane (LP) gas.3Factory recommended mounting heights are provided as a guideline. Actual conditions may dictate variations from the above data.  Always maintain the published clearances to combustibles. Clearances published in FA Series manual and on warning label supersede data shown on this website.


FA Series

FA-Series-Unit-Heater-Brochure FA Unit Heater Manual UH Packing LIst
FA Brochure FA Manual FA Packing List
FA Unit Heater Submittal Sheet LSH140_UH-FA-Concentric-Vent-Box-Inst_9-13-th
  FA Submittal
Concentric Vent Box


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