Free heating at home: Ceramic pots and tealight candles

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I am into saving money whenever possible and I was looking into heating at home for free when I came across the ceramic pot and tealight method. This is something I am going to try next week as it is pretty cold here right now and one of my bathrooms has no heating in it. I will post an update on this and my findings once done. Have you heard or tried this method and if so, what were your thoughts?