“Candle Powered Heater! (Improved!!) DIY Radiant Space heater! (with fan!!). Easy DIY. Produces 170F+ Temps. Since about half of all the heat from a clay pot heater is typically concentrated at the top of the heater, it just quickly rises straight to the ceiling and is “in effect” lost (or at least “not felt”). This new design attempts to tackle that problem by directing the hot air where you want it (in your personal living space, not at the ceiling).