Originally Posted by ExAcHog
While it does not make the candle itself produce more heat, having the steel and clay heated up will absolutely produce more heat. The heat produced by the flame is retained for much longer and acts like an additional heat source. My boys tried this in scouts years ago and it made a surprising difference.
After burning for 15 or so minutes, the terra cotta was VERY warm to the touch and the steel was so hot you could NOT touch it.
btu is btu but an open flame is not efficient use of the potential of the wax
when it makes soot it is running too rich and is missing some of the heat energy of the conversion of the carbon to carbon dioxide