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If you want to heat a room with just one candle and save even more money you need to create thermal mass and then radiate it with terracotta pots. It more simple than you could ever imagine.

Terracotta Pot Candle Heater - Hacked Gadgets – DIY Tech Blog - great forum discussion on how and why they work. You'll be happy you made a couple of these in an emergency. They won't heat your whole house of course, but they'd take the chill out of a bedroom or small room.

from Off Grid Survival - Wilderness & Urban Survival Skills

Emergency Candle Heater: Building a Single Candle Clay Pot Radiator