• Sterling GG45 Gas Heater - 4070615
  • Sterling GG45 Gas Heater - 4070615
  • Sterling GG45 Gas Heater - 4070615
  • Sterling GG45 Gas Heater - 4070615
  • Sterling GG45 Gas Heater - 4070615
Free Shipping
This item ships by UPS GROUND
Free shipping is not available to AK and HI.
Retail: $829.00
Price: $729.00
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 # GG045A1NSA11, GG045A1PSA11, GG045A2NSA11, GG045A2PSA11

Overall Customer Rating of 9 Reviews:
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Gas Furnace - Garage

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I bought two of these for my garage (heating two rooms independently), American made and reflective of this. The installation was straight forward & easy. I'm very pleased with them. ACF shipped them promptly and followed up well with questions and minor service/shipping issue. These buys were a great value. One determining factor is that these furnaces are separate combustion ready... as one of my rooms is a woodshop with solvent fumes. This made the purchase very much well worth it. Very happy customer.


GG45 Heater

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I built a 2 car garage and I needed heat. This heater did the trick. Works GREAT.


Garage Heater

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Installation was fairly simple. Had to read instructions a few times to find all requirements. The drawings do not contain some critical dimensions. Getting the heater up to the ceiling was the hard part but with my wife's help we got it done without injuries. The holes on the air intake box do not line up with the holes on the back of the heater but I was able to make the connections fit. The heater started without any problems. Fairly quiet. I had LP gas line to garage but had to extend it up to the heater. I called LP gas supplier to check gas line installation.

Great Unit

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Quieter than I thought it was going to be, happy so far

Akron Ohio

Compact and powerfull ,Sterling GG45 gas heater , easy installation.

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Nice heater , heats my two car garage well , and ACFgreenhouse are great people to deal with . Very satisfying to do business with honest knowledgeable people .
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