I've heard of using butane before, I've just enver tried it myself. Mainly because whenever you hookup the butane can to the pipe bomb (pretty much what you make to extract the oil), you're supposed to be outside where it's well ventilated. I don't think my neighbors would take kindley to a guy standing outside with a rig involving butane and pvc pipe. Plus, you know it could blow up or something and I'm not in a rush to get my face blew off.