This video is about testing if a CLAY POT using TEA LIGHTS will heat a room. I find out the truth after 4hrs. I start just after 6pm and end up seeing how it is at around 10pm.
I tried to make it convection based but the second pot kept putting the tea lights out. I might have to try different sized pots, but the one did just fine!
Learn more about Convective heat here: http://en.wikipedia.org/wiki/Convective_heat_transfer
Clay pot and four tea lights work extremely well for half a day heating of a room about 15 feet by feet!