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Electric Tubular Heaters

How to choose the right sizes and wattage for your greenhouse
These aluminium Tubular Heaters are rated at approximately 60 watts per foot (30cm). The wattage of each heater available in the range is shown below:

Heater  Length  Wattage 
1' 31cm 60w
2'
61cm
120w
3'
91cm 180w
4'
122cm 240w
5' 152cm 300w
 6' 183cm 360w

Very roughly speaking, to maintain a temperature of 45ºF (15ºC) you'll need approximately 25 watts of power per sq.ft. of floor area. E.g. 1KW would heat approximately 40 sq.ft. (5' x 8').

To calculate the heater or number of heaters you'll require within your greenhouse is affected by a number factors:
(1) the size of the greenhouse
(2) whether the greenhouse is insulated or not
(3) the external temperature
(4) the internal temperature required.
It is therefore only possible for us to provide you with a rough guide as to the tubular heater(s) you'll require. The table shown below shows you the wattage required to keep your greenhouse frost free - whether insulated or not insulated - & the possible combination of heaters required to achieve this:

Greenhouse Size
Insulated Wattage Required
Quantity / Size
6' x 8' / 1.8 x 2.4m
yes 936w 3 x 5'
6' x 8' / 1.8 x 2.4m  no
1170w 3 x 6'
8' x 8' / 2.4 x 2.4m
yes 1123w 3 x 6'
8' x 8' / 2.4 x 2.4m  no 1404w 4 x 6'
8' x 10' / 2.4 x 3.0m
yes 1310w 4 x 6'
8' x 10' / 2.4 x 3.0m  no 1638w 4 x 5' + 2 x 4'
8' x 12' / 2.4 x 3.6m
yes 1497w 5 x 5'
8' x 12' / 2.4 x 3.6m  no 1872w 4 x 6' + 2 x 4'
10' x 12' / 3 x 3.6m
yes 2059w 4 x 6' + 2 x 5'
10' x 12' / 3 x 3.6m  no 2574w 4 x 6' + 4 x 5' 

The table above illustrates how important insulating your greenhouse can be. By simply lining your greenhouse with Heatsheets you'll reduce the size or number of heaters you'll require to keep your greenhouse warm

By attaching a thermostat to the heaters - for example our Greenhouse Thermostat - you'll ensure your heaters are only run when needed to maintain the temperature you specify.



 

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