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$565.00 single stage thermostat 
$645.00 with a setback thermostat

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Best small greenhouse heater on the market.  Very reliable.

A-1 AUTOMATIC SOUTHERN BURNER GREENHOUSE HEATER

Southern Burner Company's unit heaters are exactly what the name implies... individual units designed to be used singly or in groups to heat a unit of space to meet individual greenhouse requirements. Southern Burner heaters circulate warm air over the greenhouse somewhat like the heat rays from sunshine, from the floor up. They do not radiate heat because radiated heat goes directly to the top of the glass in the greenhouse and is lost.  With Southern Burner Unit Heaters, the temperature at the top of the greenhouse can be held within 5 to 7 degrees of the floor temperature. 

Southern Burner heaters have been in use in greenhouses all over the United States since 1932. In thousands of applications, this method of inexpensive heating has helped make if possible for the average person to have and enjoy a 'backyard' greenhouse, and at the same time make it possible for the large greenhouse operators to expand their glass area to the maximum without the expense of costly heating systems. 

Southern Burner heaters will heat the same area as other systems on as little as half the fuel cost. 

Convenient... Economical... Space-saving... and most important, plants and flowers grown in greenhouses equipped with Southern Burner heaters have always been top quality.

There is NO electricity required.  That means it will be running for you when the power may go out.  All it needs is natural gas or propane, tell us when you purchase which.  And whichever you choose it can easily be changed to the other at any time by just changing the orfices, one in the gas line and one in the pilot line. I have personally used theses heaters for over 50 years, reliability, easy maintenance and easy to get parts.

The Model A-1 Unit Heater is an enclosed flame heater that requires venting to the outside of the greenhouse. It also requires a fresh or combustible air intake from the outside of the greenhouse. (see Installation)

The A-1  - 16.25 inches wide, 17.5 inches deep and 25 inches tall, constructed of non-rusting aluminum outer shell, supporting a 24 gauge aluminized steel firebox with vertical flues for maximum air circulation with a stainless steel burner enclosed rated at 25,000 B.T.U. input. This heater must be vented with a 3 inch vent pipe for proper draft. 3"Vent pipe is not included can be obtained from Home Depot or the like, use doublewall near the heater or isleways if the vent pipe is close to where people walk or kids can climb.

Installation
A 2" to 3" PVC air intake pipe should be installed as the figure shows. The outside end should be screened to keep out critters. A piece of window screen over he end will do the trick.   The pipe extending outside  should stop about three inches from the heater, and about four inches up from the floor.

Heating Capactiy and Ventilation
Southern Burner heaters are designed to operate under the side benches, installed flush with the front edge of the growing bench or at the end of the isle. In northern states, it is suggested that one unit be placed for every 150 to 175 square feet of floor space in a conventional greenhouse. In central states, place on unit heater to every 200 square feet of floor space. In the southern states, we allow as much as 225 square feet to one unit. Do not over look the necessity of providing a way for fresh air to enter the greenhouse. This is a 'must' and should not be eliminated. Illustrations show the proper way to install the air intake pipe for the model A-1. A slight top ventilation is also necessary in the greenhouse to provide for circulation and exhaust. In case of heavy snows, take care not to let the vent pipe get buried. 

Single Stage Thermostat
Southern Burner heaters are equipped with millivolt controls and wall mounted thermostat that require no electricity for operation. Two styles are available: The first being a Single Stage Thermostat that has a temperature range of 45 to 75 degrees. When you select a temperature setting the heater will cycle on and off at this setting.

Set Back Thermostat
The Second Style is a Day and Night Set-Back Thermostat. This gives you the capability of two separate temperatures, one for day and one for night. The thermostat has an adjustable clock that you can choose from 15 minute intervals to set the temperature change from day to night settings. The clock is powered by an "AA" Alkaline battery still giving you the convenience of no electricity. Temperature range is from 50 to 90 degrees. Mounting of the thermostat can be up to 25 feet from the heater and should be shielded form direct sunlight or water. 

Lighting the Pilot
You will need access to the front of the heater to light the  pilot.  I find one of those little hand held lighters used around the kitchen or b’bcue really handy for this.  Looking thru the hole in front, while holding the gas valve to pilot with the left hand and reaching under the heater witih the right hand and the lighter is pretty easy.  First time hold it for  a few seconds as the gas has to push the air out of the line. 

Maintenance
To save myself grief later on I always cover the automatic valve with a discarded plastic bottle.  I get a big bottle like one used for Pinesol maybe, square, and cut the bottom  off.   Then with a few cuts up the sides you can turn it upside down and slide it over the whole gas valve clear past where the gas lines come in and go out of the valve.  Before you cover it spray a good oil lubricant into the area where you turn the handle from OFF to PILOT or ON.

Safety
A-1’s have a 100% safety cut-off feature. If the pilot flame should go out for any reason, the millivolt control in the gas valve will shut off the gas to the heater.   For this reason it is good to NOT to have drafts around the back of the heater that could blow the pilot out.

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