Requires no electricity! 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. The A-1 is square in design - 16.25 inches wide, 17.5 inches deep and 25
Requires no electricity! 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. The A-1 is square in design - 16.25 inches wide, 17.5 inches deep and 25 inches tall, constructed of non-rusting mill polished 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. This heater must be vented with a 3 inch vent pipe for proper draft (Vent Pipe, Flashing, and Raincap are not included). In areas where there is heavy snowfall, it is necessary to arrange to keep the ends of the air intake pipe open. This can be accomplished by tilting something over the outside opening while the snow is falling.
A 2" to 3" PVC air intake pipe should be installed as the figure shows. The outside elbow should be turn down to keep out water and screened to keep out rodents. Intake pipe can be offset to one side. It does not have to be in center of heater. The pipe extending outside must be no more than 12" vertically from inside floor grade, and should stop about three inches from the heater, and about four inches up from the floor.
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 35 to 75 degrees. When you select a temperature setting the heater will cycle on and off at this setting. Regardless of the time of day or night.
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 45 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.
Safety - All controls have a 100% safety cut-off feature. If the pilot flame should go out for any reason, the millivolt control would shut off all gas to the heater. Pilot flame would have to be re-established before heater would operate.
Natural and L.P. Gas - 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. Heaters are available for natural or L.P. gas. Heaters on L.P. gas must have a regulator on L.P. tank.
Heating Capacity - 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.
Proper Ventilation - 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 (C-1) and 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 as the heaters need oxygen to burn properly.
I purchased this heater 2 years ago. Very satisfied in the performance. Heats up to 150 square ft beyond that amount of sq ft you need a 2nd heater. Cleaning the burner may be a little bit troublesome once you get the hang off it. The installation is a little pricey but all is worth it.
Good Heater for Riga Greenhouse
Works great. Perfect for my 17 x 10 Riga Greenhouse.
This heater keeps about a 25 to 28 degree difference in the temperature from the outside. I do feel that it would not handle a much bigger greenhouse than mine. (10x15) I might note that my glass is standard glass and not glazed, doubled or treated. This heater is great for what I have and would reccomend this to anyone. Be sure you have some knowledge of Thermostats and propane heaters.
I have had mine for 3 years with no problems. I grow orchids and keep a 14 x 22 double walled glass with twin walled poly carb. roof. at 55 deg. in TX. Only time it had trouble keeping up is when it did not get above 20 all day. I threw a plastic tarp over the greenhouse that day and it worked fine.