At around two minutes the guy mentions that back when he used CRT monitors for his computers instead of flatscreens, the room stayed warm in the winter. An old 19 inch viewsonic CRT monitor uses about
100 watts while an
LED uses
12 watts. So, 1.5 kilowatt hour of heat is
enough to keep that room warm, which is maybe 15-20 cents depending on where you live. Eight of those candles would cost 12 cents.
I'd rather just use electricity and not deal with the candles.