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Sterling Gas Garage Heater Information
(for Sterling GG propane and natural gas heaters)
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Sterling GG Heaters

Additional Sterling GG Gas Heater Information

Sterling GG Specs. & Dimensions (PDF file)
Sterling GG Gas Heater Assembly Manual (PDF file)
Sterling GG 4" Concentric Vent Manual (PDF file)
Sterling GG 5" Concentric Vent Manual (PDF file)

Sterling Garage Recommendations
Square Feet
1 to 1-1/2 Car Garage
200 - 400
2 to 2-1/2 Car Garage
400 - 600
3 to 3-1/2 Car Garage
600 - 800
4+ Car Garage
800 - 1000
+ Garage or Warehouse
1000 - 1200
+ Garage or Warehouse
1200 - 1400
+ Garage or Warehouse
1400 - 1600

Separated Combustion with Optional Concentric Vent Kit
Sterling GG heaters can be converted to separated combusion when the optional Concentric Vent Kit is purchased. Separated combustion heaters draw combustion air from outside to ensure that the unit will always have plenty of fresh clean air. The fresh air supply reduces common concerns about dusty, dirty, or high humidity applications. GG separated combustion heaters are great options for buildings with negative pressure, greenhouses, auto repair and parking garages, and are also used to more safely heat areas where indoor flammable gasses may be present. The available concentric vent kit allows the air intake and exhaust to vent to the outside wall with only one pipe as shown in the picture below. This venting method heats the outside combustion air with the exhaust pipe before entering the heater which can increase overall heater efficiency by as much as 10%. The vent kit includes the concentric vent box, inlet air screen, deflector box, vent cap, air intake adapter, and sealant (can be used with vertical installations as well).
Sterling  GG Vent Kit

Sterling Tubular Heat Exchanger
Other unit heaters available today are designed with the old clamshell style heat exchanger, positioned above ribbon-style burners. These are the most common points of failure, especially in the greenhouse environment. Heat exchangers invariably fail at the points where manufacturing processes have weakened the metal by stamping, crimping and welding. Sterling GG gas heaters are equipped with a tubular heat exchanger which consists of smooth, continuous tubes are formed in a serpentine shape and then placed in parallel rows. This type of heat exchanger has no stress points, no points where the metal has been compromised making it more durable than a similar clamshell heat exchanger and allowing the unit to be equipped with in-shot burners.

Sterling Advanced Burner Design
Sterling GG's burner design is more akin to that of a fire-tube boiler than a unit heater. With this in-shot burner, the flame is retained inside the heat exchanger and fires down the inside of the heat exchanger tube. This design accomplishes three things: First, it eliminates the need for separate conventional ribbon-style burners; Second, it enhances flame quality and heat transfer; and Third, it eliminates most burner corrosion problems. Conventional burners fail when moisture from condensation drips on them. This problem is eliminated with the Sterling in-shot burner system.

Sterling Control System
Single Stage, Direct Spark Ignition, 100% Shutoff with Continuous Retry - Utilizes a single stage combination gas control with built-in ignition control. Gas is lit with an electronic direct spark igniter on call for heat. Most gas heaters have pilot flames which must stay lit all the time for the heater to perform. This igniter comes on only when heat is needed every time heat is needed! 115 volt power supply and 25 volt controls.

Sterling Power Vent System
Every Sterling gas heater features a blower powered vent exhaust. Power vents force heater exhaust fumes outside of the heated structure, and allow the heater to be vented vertically or horizontally. Horizontal venting keeps heat from escaping out of the vent pipe when the heater is not running. This is especially important when using gas powered heaters in greenhouses. Conventional vents use natural air drafts (chimney effect) to expel exhaust fumes. Unvented gas heaters leave these fumes in the greenhouse which can be harmful to plants.
Sterling Diagnostic System
Every Sterling garage heater has advanced diagnostic controls that monitor all primary heater functions for dependable, worry-free operation. If the gas heater doesn't start, a LED diagnostic light on the heater will flash indicating where the problem occurred and makes fixing the problem quick and easy.

Sterling Safety Devices
Limit Control (Overheat Switch) - will shut off the gas to the heater should excessive discharge temperatures occur.
Flame Rollout Switch - will shut off the gas supply to the heater in the event of flame rollout.
Pressure Switch - will shut off the gas supply to the heater in the event of a problem with the venting system.

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 ACF Greenhouses
380 Greenhouse Drive
Buffalo Junction, VA 24529
434-374-2706 Phone, 434-374-2055 Fax
888-888-9050 Toll Free

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