emergency candle holders--I just noticed that the lid with the candle holder and candle is upside down. For storage, as the other jar shows, if it's right side in, the candle holder doesn't show. Nice touch!
Wow, great idea, and the manufacturer actually explains it for DIY-ers! It doesn't really heat a whole house, but for a small hut, it could work on cold spring/fall evenings when you don't want to start the wood stove.