"tina" wrote in message
...
Hi,

I have an 8ft x 4ft greenhouse and would like to add a heater to keep
out the cold.
I thought it best to get an OIL filled one rather than the electric
fan type.

I see they go in W rating from 1000w, 1500w, 2000w & 2500w.

Can anyone advise me what size is best?

I'm growing peas, tomatoes & carrots.

Thanks
I do not heat mine but I am confident that if you google for greenhouse
heaters one of the sites you hit will have a table for working out what you
need (there are several variables - i.e. lean too or free standing what
temperature above outside you wish to maintain and whether there is any
insulation).

--
Charlie, gardening in Cornwall.
http://www.roselandhouse.co.uk
Holders of National Plant Collections of Clematis viticella (cvs) and
Lapageria rosea