Pioneers were the emergency preparedness and food storage masters of their time. From the pioneer provision list, to their cooking equipment and recipes, preppers are wise to take note of techniques and tools used by the pioneers who "bugged out" West from 1840-1890 along the Oregon Trail. http://www.happypreppers.com/Pioneers.html
Candle Powered Heater - I've been looking a various ways to make these and this guy has by far the best setup. It isn't so much a how-to video. He is just showing what he used to construct his version of the terra cotta pot candle heater.
Use 3 to 5 tea lights under a slow cooker pot / crockpot to heat your room. I have tried flowerpot, plantpot heaters and this is way better. Throws out a lot more heat, doesn't smell like some clay ones tend to do, plus you don't have to mess about with multiple pots or nuts and bolts. I used a small crock 1.5ltr which gave out loads of heat. Give it a try. You will be surprised how well it works. Ideal if you have power cuts / power outages.