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Old 29-12-2005, 06:12 PM posted to uk.rec.gardening
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Default greenouse heaters, soil warming cables, etc

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What do you all use to heat your greenhouses?

Are soil cables best since they take the heat to where it is required,
rather than fan heaters which heat the air, most of which does not
come in contact with the plants and quickly escapes?

I have a 3kw greenhouse fan heater but when we had the frost last time
I was unhappy with its frost setting. The problem is that the heater
switches on and the heater body warms-up so the thermostat switches
the heater off. The problem is only the fan heater is now above
freezing; the rest of the greenhouse is not!

I think you need to turn the heater onto the highest setting so that
it is always on and use a separate thermostat to switch it on and off.
I have seen some of these but I don't think they were intended for
outdoor use.

Depends what size greenhouse you want to heat,how full is it,what is in
it/minimum temp you want to keep,if not alot could you section it to save
costs.If only a few small plants then possibly a soil warming cable /stat
with a frame above enclosing with bubble insulation .
I have a 10x8 greenhouse for growing orchids,i keep a min temp of 58f with a
3 kw electric fan heater on full controlled by a independant
thermostat/sensor.I also have two fans running 24/7.
So what you intend to grow is the factor in what setup is needed.Also good
insulation of the greenhouse is key in keeping the costs down.Don't even
consider using a heater without this.
Cheers Keith
PS don't be shy ,give a name.

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