Shaz,
I have two 4ft tubular heaters for my 10ft x 5ft shed, shed is fully insulated, the temp outside is 3c up here in Scotland, inside the shed it never drops below 19c at night, during the day with lights on it is 21-24c these temps are at floor level. At head height it is 30-34c. At the moment I have the heaters on 24hrs a day, there not much to run. As the weather gets warmer (eventually) I hopefully won't need these on during the day. I also have one heater in the cold frame attached to the shed which even in this weather keeps the cold frame above freezing. My torts not allowed in here yet until end of April when the weather improves.
Hope this helps
Andy
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