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Item # TF-400, Gas Fired Unit Heater

The Sterling Model "TF" and gas-fired unit heaters offer a highly efficient, extremely durable alternative to the traditional clam shell design. These propeller type units combine the latest tubular heat exchanger and inshot burner technology with the quality and reliability you have come to know from Sterling. Model “TF” units are certified by CSA International for use in commercial and industrial applications. Sizes are available in 30 to 400 MBH.

High Efficiency
Standard energy saving features like the HSI (hot surface ignition) pilot and power venting reduces standby losses and offers improved seasonal efficiencies. Both models are certified by CSA International as providing over 80% thermal (combustion) efficiency.

Tubular Heat Exchanger
The Sterling tubular heat exchanger has been designed toprovide maximum and uniform heat transfer. The low pressure drop associated with this design enables heated air to be evenly distributed to the conditioned space. This curved, non-welded serpentine design experiences less thermally induced stress making it highly durable for significantly longer service life. All Sterling tubular heat exchangers are constructed of heavy duty 20-gauge aluminized steel. Optional 409 stainless steel is available (sizes 100-400 MBH only).

Hot Surface Pilot Ignition
Sterling Models "TF" units utilize a hot surface pilot ignition system which features a ceramic composite hot surface element. This highly reliable and efficient ignition system does not permit pilot gas to flow unless the hot surface element is present and powered. The low voltage hot surface element lights the pilot quickly for fast heat delivery.

Sterling Model "TF" unit heaters are CSA International certified in accordance with categories I and III venting requirements. Category I enables the unit to be vented vertically with either single or double wall venting material. Category III allows for horizontal venting utilizing single wall venting material. This venting flexibility makes installation easier and more cost effective by allowing the installer to utilize existing venting components.

Control Accessibility
Designed with the service person in mind, every component of the Sterling Gas-Fired Unit Heater is easily accessible. Ignition and fan controls are located in one centrally located control panel. The removable access door provides control isolation as well as a pleasing exterior appearance.

10-Year Warranty
Sterling warranties the heat exchanger, flue collector and burners of both the Model "TF" to be free from defects in materials and workmanship for a period of 10 years from the date of manufacture.





400000 Btu/hr


324000 Btu/hr








Natural Gas

Standard Features

  • Inshot burner design
  • Hot surface pilot ignition
  • Individually adjustable and removable louvers
  • 20-gauge steel jacket with baked enamel finish.
  • 120/1/60 supply voltage
  • Easy access control panel
  • Power vented
  • Single stage combination gas valve
  • 120/24 volt control transformer
  • 115/1/60 volt fan motor with internal overload protection
  • Right hand control access. Field convertible to left hand access (low profile sizes 30-90 MBH only).


TF Parts Listing
(PDF, 1376KB)

TF Sterling Brochure
(PDF, 340KB)