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Compare Garage Heaters
Modine Garage Heater
Empire Gas Heater
Sterling Garage Heater
Electric Greenhouse Heaters
Compare All
Heaters
Modine Gas
Heaters
Williams Gas
Heaters
Sterling Gas
Heaters
Electric
Heaters
Radiant Gas
Heaters

Electric and Gas Heater Comparison
Click on a picture or underlined text to view more information about the heater.
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Electric Heating Equipment
 
Radiant Gas
Electric Greenhouse Heaters
 
Electric Heating Mat
 
Electric Space Heaters
 
Other Heating
 
Outdoor Heating
120v Heaters
 
240v Heaters
 
Mats & Cables
 
Patio Pal Gas Heater
Price Range
 
Price Range
 
Price Range
 
Price Range
$50 - $109
 
$149 -$489
 
$19 - $95
 
$955 -$1025

Propane and Natural Gas Heaters
Empire Gas Heater
 
Modine Gas Heaters
 
Williams
 
Modine
 
Sterling
Direct Vent Heaters
 
HD, PD & PDP
 
GG, TF, GF, HU
Price Range
 
Price Range
 
Price Range
$585 - $749
 
$565 - $1729
 
$579 - $5595

Gas Heater Comparison Chart
Click on the underlined text to view more information about the heaters.
Heater
Manufacturer
Model
Output Range
Mounting Type
Combustion
Type
Vent Type
Requires
Electricity
Venting
Included
Thermostat
Included
Williams
DV
10K - 21K
Wall
Sealed
Direct
Modine
HD
24K - 60K
Hanging
Open
Power
PDP
80K - 320K
Hanging
Open
Power
Sterling
GG
24K - 97K
Hanging
Open or Sealed
Power/
Direct
TF
121K - 324K
Hanging
Open
Power
 
GF
121K - 324K
Hanging
Open
Power
HU
48K - 384K
Hanging
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
Wall
Wall mounted heaters are attached directly to a wall and vent through the wall to the outside of the structure. They do not take up much floor space, but the area in front of them should be free of obstructions.
Floor
These heaters require no mounting. They have feet and can be placed directly on the floor. They take up the most floor space but can be placed under a bench to minimize that.
Hanging
Hanging heaters are generally mounted directly to or hung from the ceiling. They use the least amount of floor space as long as the heater can be hung high enough to not be in the way.
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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 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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