I'm glad someone started this thread as I'm having some problems with my heater. It is a Parasene heater for the size of greenhouse I have and it's not so much smokey as stinky. My husband lights it and I think he may have done what everyone else has and turned it up too far. I can smell the stink outside the GH even when the door is closed and when you have been in the GH your clothes stink of paraffin. It also seems to be affecting the plants, some of them don't look too good. Help! I can't even turn it off, as during the day for the last three days it hasn't moved above freezing here and Alex (OH) isn't keen to do anything in the dark so will have to wait until weekend.