I would imagine you could use this method(as originally posted)over a gas stove if you are careful with a low heat setting.

Anyone tried the alcohol method over an open flame?
sunbiz1 Reviewed by sunbiz1 on . THC extract Heyy guys Dnt know if anyone has posted this, Sorry if someone did. Got this off THC extraction from Marijuana "If you ever had to think twice about lighting up a joint for fear of someone smelling it. If you were ever forced to blow the smoke out a window and pray you don't reek of weed. If you ever had to sneak around and couldn't enjoy a good buzz..." Easy THC Extraction © 1995 Axis Innovations Rating: 5