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 MBH in a compact, low profile design. 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. 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. 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. 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. 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. 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. 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. 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 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.
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! Back to Sterling Heater Pricing Page. Compare Kits. Solar Harvest. Climate Controls. Containers Plant.
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