Heating with Tealights

M.V. posted a link on FB to a video describing how to use 4 tealights in a ceramic tray with a couple terra cotta pots to heat a room.  The cost works out to 30 cents a day, supposedly.

One of the comments on FB was also interesting:

Truckers in Alaska have used coffee cans with a roll of toilet paper inside that is drenched with rubbing alcohol. Burns clean puts off heat. Whatever works.

I'll have to give both these methods a try.  Also, the Knowledge Weights Nothing site looks quite intriguing.