I had seen something called an Origo Heat Pal online, looks like an oversized trangia. I think it will run on meths or spirit. Cost between £100--150. I would like something similar to heat my tent a bit. Any DIY suggestions? I have a nylon tipi without a chimney. I am wondering about how I could burn spirit/alcohol in a safe stable burner? Would a few thick wicks produce much heat? Presumably this Origo device is safe. I don't want to create somekind of lethal Moloktov cocktail for tents......