A cone 6 kiln firing to cone 6 will only get maybe 50 firings before the elements need to be replaced. Once they wear even a little bit, the kiln can no longer reach its max temp. In a cone 10 kiln firing to cone 6, the elements can wear a lot more before they need to be replaced. If your cone 6 kiln is getting more firings that that, then it is probably under-rated. Brick thickness is often the determining factor on the max temp rating of a kiln. Kilns are either rated to a max te