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ABC Guide to Greenhouse Heaters
At garden4less.co.uk
we want to make sure that you select the correct greenhouse heater for your
requirements and that's why we have come up with this simple ABC guide to
greenhouse heaters. By following these simple step you can select the correct
heater for your Greenhouse.
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A - Selecting a Fuel Type
There are 4 main fuel types for running a greenhouse
heater. Select your fuel type based on the following
points:-
>> Electric Heaters The obvious
first question here is do you have an electrical outlet in
your greenhouse or is the greenhouse close enough to the
house to run an extension cable it. If not then this isn't
an option.
The advantages with electric heaters is the lack of fumes
and that most electric heaters are fan assisted and
thermostatically controlled. The fan will allow the the heat
to be distributed better around the greenhouse, especially
with heaters hung from the roof as with the Bio Green
Phoenix.
Many electric heaters also double up as a cold air fan in the summer to allow air circulation around the greenhouse.
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>> Propane Heaters
If its not
possible to get electricity to a greenhouse then propane is
usually the second choice for medium to large greenhouses.
Although they are not as efficient and they produce fumes
from the burning process they are an easy solution to
getting heat into the greenhouse. Its fairly easy to get
hold of a propane bottle in the UK, but it will need to be
stored safely.
>> Natural Gas Heaters Having a
gas supply in your greenhouse takes the need away from
obtaining a propane bottle and replacing the bottle
periodically, but the initial outlay in getting a gas supply
to your greenhouse makes this the least popular choice.
>> Paraffin Heaters This is
usually only an option for smaller greenhouses and cold
frames. A Paraffin heater will need to be re-filled
frequently and the wick will also need maintenance. The heat
control will be very basic and we would only recommend using
a paraffin heater for frost protection or as backup for a
main heater. |
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C - Your Heating Requirements Your greenhouse
sizes isn't the only factor to consider when selecting the power
output of the heater, you need to consider your heating
requirements. Are you trying to heat your greenhouse or just
offer frost protection? The following guide allows you to work
out the kw output needed to provide the required heat levels in
your greenhouse. It doesn't need to be exact as the heaters are
adjustable.
1Kw - Heat 48sq ft -
Frost Protection 80sq ft
2Kw - Heat 60sq ft - Frost Protection 120sq ft
3Kw - Heat 120sq ft - Frost Protection 260sq ft
4Kw - Heat 150sq ft - Frost Protection 350sq ft
6Kw - Heat 200sq ft - Frost Protection 500sq ft |
Beware of fuel estimate calculators on the internet, we
have found that they are not at all accurate. The purpose of
these are to estimate the amount of fuel you will use during
the winter but we have tested these out and they appear to
be very inaccurate. We have even managed to come out with
negative values, meaning that if you use a greenhouse heater
then according to the calculators you would actually be
getting a cheque back from the power companies.
The reason these will not work is that many people use a
greenhouse heater to protect from frost and in effect they
will only turn on when the outside temperature drops below
the required temperature, so no matter what the average
temperature during the winter you are only actually using
the heater at certain times and the lower the outside
temperature the harder the heater has to work and the more
fuel it will use.
If you now know which fuel type you need and the required kw output
you can make your purchase.
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