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Google "clay pot heater"
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Place four tealights in the bottom of a metal bread tin. Light the candles and place a ceramic flowerpot (upside down) over the top. Block off the pot's hole, using an empty tealight casing, and place a larger flowerpot over the top.The simple design creates a system of convection. The flowerpots heat up the air in the space between them, which then rises through the hole at the top, while drawing in cool air from the bottom.
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Greenbank
@Chalfie
@Gaston_Fr how does it work? the heating that is.