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DIY:: Flower Pot Heater ~ Gives a lot of heat, costs about nothing, easy to make and it looks pretty nice, too! Clay/Terracotta pots absorb the thermal energy of the candles and convert it into radiant space heat. Reaches temperatures of 160F to 180F. Heater stays hot for hours. use caution, the inner chamber can reach 500F. Heats a small area very effectively. uses 1 to 3 candles or more. How To @: www.youtube.com/...
Use 3 to 5 tea lights under a slow cooker pot / crockpot to heat your room. I have tried flowerpot, plantpot heaters and this is way better. Throws out a lot more heat, doesn't smell like some clay ones tend to do, plus you don't have to mess about with multiple pots or nuts and bolts. I used a small crock 1.5ltr which gave out loads of heat. Give it a try. You will be surprised how well it works. Ideal if you have power cuts / power outages.