Electric Tubular
Heaters
These aluminium tubular heaters are rated at
approximately 80 watts per foot (30cm). The wattage of each heater
available in the range is shown below:
| Heater Length |
Wattage |
| 2' / 61cm |
160 |
| 3' / 91cm |
240 |
| 4' / 122cm |
320 |
| 5' / 152cm |
400 |
| 6' / 183cm |
480 |
| 8' / 244cm |
640 |
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 acheive this:
| Greenhouse
Size |
Insulated / Not
Insulated |
Wattage
Required |
Heater(s)
Required |
| Mini Greenhouse |
insulated |
327 |
1 x 2' & 1 x 3' |
| Mini Greenhouse |
not insulated |
N/A |
N/A |
| Mini Lean To |
insulated |
327 |
1 x 2' & 1 x 3' |
| Mini Lean To |
not insulated |
N/A |
N/A |
| 6' x 8' / 1.8m x 2.4m |
insulated |
936 |
3 x 4' |
| 6' x 8' / 1.8m x 2.4m |
not insulated |
1170 |
3 x 5' |
| 8' x 8' / 2.4m x 2.4m |
insulated |
1123 |
3 x 5' |
| 8' x 8' / 2.4m x 2.4m |
not insulated |
1404 |
3 x 6' |
| 8' x 10' / 2.4m x 3m |
insulated |
1310 |
3 x 6' |
| 8' x 10' / 2.4m x 3m |
not insulated |
1638 |
1 x 5' & 2 x 8' |
| 8' x 12' / 2.4m x 3.6m |
insulated |
1497 |
1 x 3' & 2 x 8' |
| 8' x 12' / 2.4m x 3.6m |
not insulated |
1872 |
3 x 8' |
| 10' x 12' / 3m x 3.6m |
insulated |
2059 |
2 x 5' & 2 x 8' |
| 10' x 12' / 3m x 3.6m |
not insulated |
2574 |
4 x 8' minimum |
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.
