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Compare Garage Heaters
Modine Garage Heater
Empire Gas Heater
SB Gas Heater
Sterling Garage Heater
Electric Greenhouse Heaters
Compare All
Heaters
Modine Gas
Heaters
Williams Gas
Heaters
S. Burner
Gas Heaters
Sterling Gas
Heaters
Electric
Heaters
Radiant Gas
Heaters

Sterling Gas Heaters
GG Heaters | TF Heaters | GF Heaters | Nexus Heaters

Sterling GG Gas Heaters
Sterling GG heater
SIZES:
30,000 to 120,000 BTU Input
APPROVED FOR:
Residential and Commercial use
MOUNTING:
Hanging or bottom mount
EFFICIENCY:
82 - 83%
GAS TYPE:
Propane or natural gas
VENT TYPE:
Power vented and capable of separated combustion
PRICE RANGE:
$600 - $900
FEATURES:
Low profile (our smallest unit heater)
CLICK HERE to view Sterling GG heaters

Sterling TF Gas Heaters
sterling TF heater
SIZES:
100,000 to 400,000 BTU Input
APPROVED FOR:
Commercial and Industrial use
MOUNTING:
Hanging
EFFICIENCY:
83%
GAS TYPE:
Propane or natural gas
VENT TYPE:
Power vented
PRICE RANGE:
$900 - $1600
FEATURES:
Best value commercial unit heater
CLICK HERE to view Sterling TF heaters
 

Sterling GF Shied Gas Heaters
sterling shield heater
SIZES:
150,000 to 400,000 BTU Input
APPROVED FOR:
Commercial and Industrial use
MOUNTING:
Hanging
EFFICIENCY:
83%
GAS TYPE:
Propane or natural gas
VENT TYPE:
Power vented
PRICE RANGE:
$1300 - $2500
FEATURES:
Stainless steel casing and exchanger
CLICK HERE to view Sterling GF heaters

Sterling Nexus +90% Efficient Gas Heaters
sterling nexus heater
SIZES:
100,000 to 400,000 BTU Input
APPROVED FOR:
Residential and Commercial use
MOUNTING:
Hanging
EFFICIENCY:
96%
GAS TYPE:
Propane or natural gas
VENT TYPE:
Power vented and capable of separated combustion
PRICE RANGE:
$2600 - $5000
FEATURES:
Most efficient and advanced unit heater
Variable heat output from 35% to 100%
Can be vented with PVC pipe
CLICK HERE to view Sterling Nexus heaters

Sterling Heater Comparison Chart
Click on the underlined text to view more information about the heaters.
Model
Output Range
Efficiency
Combustion
Type
Vent Type
Requires
Electricity
GG
24K - 97K
82-83%
Open or Sealed
Power / Direct
TF
121K - 324K
83%
Open
Power
GF
121K - 324K
83%
Open
Power
Nexus
97K - 388K
97%
Open or Sealed
Power / Direct

Heater Output Range
The output range is measured in thousands (K) of BTUs. This is the measure of heat output from a heater. To determine how much heat is needed for a greenhouse, you can use our Greenhouse Heater BTU Calculator.
Heater Mounting Types
Heater efficiency is the percentage of heat produced that is not exhausted to the outside of the structure being heated. The higher the efficiency, the lower your heating cost will be.
Heater Combustion Types
Open
This heater uses inside air for combustion. It is fine for areas that do not have contaminants in the air that can damage the heater. The burner is not sealed inside the heater so flammable liquids should not be placed close to the heater.
Sealed/
Separated
This gas heater uses outside air for combustion which is better for areas that have a lot of contaminants in the air like wood shops. The burner is sealed inside the heater so all of the air used for combustion is brought in from outside the structure. This type of heater has an intake and exhaust pipe (either separate or one inside the other) which is run to the outside of the structure.
Heater Vent Types
Unvented
Unvented gas heaters are not vented to the outside. Gases produced from combustion are released directly into the heated area. This type of gas heater is only recommended for temporary use in a greenhouse because many plants are very sensitive to the by products.
Gravity
These gas heaters require vertical venting because the exhaust must rise through the vent pipe and is expelled outside. They are dependent on natural drafts to move the exhaust through the vent pipe. Outside air must be brought into the structure to replace the exhausted air.
Power
Power vented heaters are equipped with a blower that pushes the exhaust air through the vent pipe and outside of the structure. Most power vented heaters can be vented vertically or horizontally and use smaller vent pipes than similar size gravity vented heaters increasing their efficiency. Outside air must be brought into the structure to replace the exhausted air.
Direct
Direct venting is unique to sealed combustion heaters. It uses 2 pipes (ususally one pipe placed inside the other) to provide the heater with both an inlet and exhaust. When heated exhaust air leaves the vent pipe, it automatically pulls in the same amount of outside air in exchange for combustion. The outside air is also heated as it passes over the exhaust pipe and into the combustion chamber. No additional outside air must be brought into the structure to replace the exhausted air. This system can be gravity or power vented.

Not sure what size heater you need for your greenhouse? Use our Heater BTU Calculator.


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


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