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Greenhouse Heater BTU Calculator
If you plan on using your greenhouse on a year round basis, supplemental heat is necessary to keep the temperature above freezing.

The heating requirements for your Hideaway Greenhouse depend on the target temperature, the severity of your local winter, and the size of your Greenhouse. For help in choosing the right size heater for your greenhouse try our handy BTU calculator. Generally a 5,000 BTU electric heater will provide sufficient heat to avoid plant loss except during power outages (a backup propane heater can provide protection against power failure). A natural gas or propane heater uses less expensive fuel in some geographic regions.


Calculator requires Macromedia Flash Plugin

We use the following formula to determine the heat loss for our greenhouses.
  STEP 1
 
Desired Temperature
-
Coldest Outside Temperature
=
Temperature Difference
  STEP 2
  Temperature Difference
x 200
= Heat Requirements (BTU/HR)
If you are going to buy a gas unit heater, it will be rated in BTU output. If you are purchasing an electric heater it will be rated in WATTS to convert WATTS to BTU's multiply WATTS x 3.3. Thus a 1500 WATT heater = 4950 BTU. It may require two electric heaters for your greenhouse. If you need two electric heaters, set the thermostat on one of them a little lower than the other, and if one of them will not maintain the desired temperature, the backup heater will pick up the additional heat required. WARNING - If you use an electric heater, do not set it on the floor or on top of your benches. Mount it in a location that will not be subject to watering or electric shock. It is recommended that you call your licensed HVAC dealer to determine proper mounting locations and need for venting.
 
 
 
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