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Sterling Garage Guy Unit Heater

The Sterling model GG low profile gas-fired unit heater is a highly efficient, extremely versatile product. These propeller units combine the latest tubular heat exchanger technology with a unique single orifice burner system. Units are available in sizes ranging from 30 to 120 MBH in a compact, low profile design.

Residential Garage Certified

The Sterling model GG unit heater conforms with the latest ETL certification standards for installation in residential garages. Design certification and our low profile design make the model GG unit ideal for residential, commercial and industrial installations.

Tubular Heat Exchanger

The Sterling tubular heat exchanger has been designed to provide maximum and uniform heat transfer. The low pressure drop associated with the design enables heated air to be evenly distributed to the conditioned space. The curved, non-welded serpentine design experiences low thermal stress making it highly durable for significantly longer service life.

Single Orifice Burner

Sterling model GG units are built with a proprietary, single orifice burner system: one burner to service and one orifice to change for gas conversion. The stainless steel burner box provides even heat distribution to all heat exchanger tubes.

Direct Spark Ignition System

Sterling model GG units utilize a direct spark pilotless ignition of the burner, providing fast heat delivery. This highly reliable and efficient ignition system incorporates an integrated electronic control board to regulate the system sequence of operation, including an onboard LED indicator for simple troubleshooting.

Dual Venting

Sterling GG units are agency certified for both standard and separated combustion venting. Units are shipped to accommodate either category I or category III horizontal or vertical venting. With the addition of a Sterling concentric vent kit, the unit can be installed as a separated combustion unit.

Harker Star Rating:

This is Harker’s expert opinion on the product as a whole. Intangibles such as durability, ease of repair/install, and value are taken into consideration. We want to make it clear that we do not offer any bad products. Not every product can be used in every situation, so sometimes a 3-star product will be a better fit than a 5-star. All star ratings are pure opinion.

  • 81% Thermal Efficiency
  • Redundant Single Stage Gas Valve
  • Residential Certification
  • 20GA Aluminized Heat Exchanger
  • 120/24V Control Transformer
  • 115/1/60 Fan Motor with Internal Overload Protection
  • Power Vented
  • Direct Spark Ignition
  • 20GA Baked Enamel Cabinet
  • 10 Year Heat Exchanger Warranty
  • OSHA Fan Guard
  • Right Hand Control Access (Field Convertible to Left Hand)
  • High Limit Switch
  • Air Pressure Switch
  • Natural or Propane Gas
  • Gas Conversion Kit Included
  • Field Convertible to Separated Combustion
  • Easy Access Control Panel
  • 321 Stainless Steel Burner Box
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