It makes use of alcohol, a metal can and a toilet roll. The end product can even be turned into a stove, that too with ease. It will allow you to heat your small space during an emergency/SHTF, hiking or camping etc.
The cans that were used in the video were of Progresso soup, quart paint and gallon paint. The fuel being used was 70% isopropyl alcohol. The cans that were used for the conversion of heater into a stove were the Del Monte spaghetti sauce cans. Check out the youtube video below and see for yourself: