Abstract: Systems and methods for firing an insulator is described. A kiln includes at least three zones on a wall of the kiln, a processing unit, and at least three PID controllers. The at least three zones have at least three burners arranged vertically. The processing unit determines firing ratio information for the at least three zones. Each of the PID controllers corresponds to a zone of the at least three zones. The at least three PID controllers control supply of gas and air to the at least three burners of the at least three zones based on the firing ratio information.