• Sterling GG30 Gas Heater - 4070605
  • Sterling GG30 Gas Heater - 4070605
  • Sterling GG30 Gas Heater - 4070605
  • Sterling GG30 Gas Heater - 4070605
  • Sterling GG30 Gas Heater - 4070605
Free Shipping
This item ships by UPS GROUND
Free shipping is not available to AK and HI.
Retail: $825.00
Price: $699.00
Availability: In Stock - Usually ships in 1 to 2 days.
What are these options for?

Sterling GG gas heaters are an excellent option for heating garages, greenhouses, sheds, etc. Each Sterling GG heater includes: tubular heat exchanger, electronic ignition, power exhaust system, advanced diagnostic system for dependable worry-free operation, lots of safety features, high power fan to provide even heat distribution, rust-resistant aluminized steel exchanger, and a baked-on enamel finish made to protect them from harsh environments. Designed for propane or natural gas. Some wiring required. Requires 110/120v electricity.


  • 83% efficient
  • Made in the USA
  • Certified for residential, commercial, and industrial use
  • Direct spark ignition
  • Power vented exhaust
  • Separated combustion capable
  • Stainless steel burner is standard
  • Convenient diagnostic light and thermostat connections on outside casing
  • Mounting brackets and conversion kit included
  • 10 year warranty on the burner and heat exchanger

Heater Venting Options

Sterling GG heaters have the unique ability to be vented with a single exhaust pipe or with both an intake and exhaust pipe (referred to as separated combustion) by adding the concentric vent kit and piping. Click here to learn more about the benefits of separated combustion.

Heater Upgrade Options

Extended Parts Warranty
This extends the included 1 year parts warranty to 3 years. If replacement parts are needed, they will be provided no charge and shipped for free during the life of the warranty. Click here for terms

Heater Gas Type Setup
The heater will come equipped from the factory for whichever gas type you choose.
NOTE: A free conversion kit is also included in case you need to change the gas type in the future.

If the heater will be installed at a location that is over 5000' above sea level, Sterling makes a special high altitude model for this application. Units setup for high altitude (above 5000') ship direct from Sterling. The average ship time is 2 to 3 weeks. Must be ordered with heater.

Performance Specifications

For Greenhouse Sizing, use our Greenhouse Heater Size Calculator
Model Application BTU Input BTU Output W x D x H Weight (lbs)
GG30 1 to 1-1/2 Car Garage
200 to 400 Sq. Ft.
30,000 24,900 30" x 25 7/8" x 12 3/8" 60
GG45 2 to 2-1/2 Car Garage
400 to 600 Sq. Ft.
45,000 37,350 30" x 25 7/8" x 12 3/8" 65
GG60 3 to 3-1/2 Car Garage
600 to 800 Sq. Ft.
60,000 49,800 30" x 26 3/16" x 15 7/8" 80
GG75 4+ Car Garage
800 to 1000 Sq. Ft.
75,000 61,500 30" x 26 3/16" x 15 7/8" 85
GG90 Large Garage or Shop
1000 to 1200 Sq. Ft.
90,000 73,800 30" x 26 3/8" x 22 5/8" 95
GG105 Large Garage or Shop
1200 to 1400 Sq. Ft.
105,000 86,100 30" x 26 3/8" x 22 5/8" 105
GG120 Large Garage or Shop
1400 to 1600 Sq. Ft.
120,000 98,400 30" x 26 3/8" x 22 5/8" 110

Product Manuals, Tips, Specs, & Guides

Sterling GG Heater Specs and Dimensions

Sterling GG Heater Installation Manual

Model # GG030A1NSA11, GG030A1PSA11, GG030A2NSA11, GG030A2PSA11

Overall Customer Rating of 5 Reviews:
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Shop heater

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I bought this unit because of the sealed combustion chamber. I did the install in my 16x12 wood shop. The only issue I encountered was a loose wire. But I found the the connector on the board. Looks like the connector was too small for the wire. Not a big deal, simply fixed it and moved on. Not cold enough to run yet. But it does produce heat!
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New York

Sterling GG 30 Propane Heater

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This heater has been working great. I am heating a 400 square ft area in my work shop. It’s a nice compact heater. It is fairly quiet. I have it setup so the fan only runs when the unit is calling for heat. I also have the GG -4 “ wall thimble adjustable vent kit that’s all stainless going through my wall horizontally. Works great. We had to buy and use some regular 45 degree pipe duct to hook up for outside air which hooked on to there 4 inch stainless pipe. I added a plastic dryer vent on to the pipe which only opens when calling for outside air, it stays closed when not being used. Great unit for the money and ACF Green Houses great to work with.
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Should be packaged better

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Arrived pretty banged up and dented. I know it came in a factory box so it isn't acf greenhouses fault, but these heaters should be packaged better. Other than that after straightening out the metal the best i could the heater works great

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Start up with no problems. Has been working for over a month with no problems. Keeps the area warm with no issues.

united states

Its worth the price

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So i read a ton or reviews and was very skeptical about buying this heater for my 20x24 insulated garage and first time starting it works exactly as supposed to, fan wasn't nearly as loud as people have stated, definitely quieter than the torpedo heaters. It came dented but it's not really noticeable unless you are staring at it for a long time.

If you are trying to get it done with a reasonable price i would buy this one again.