A kiln intended to function for glass is designed to fire at temperatures up to 1700F degrees, these lower temps are suitable for most glass projects. The elements in a glass kiln are placed in the lid of the kiln, as well as on the sides. The top elements work to radiate heat onto the face of the glass surface, while the side elements radiate heat throughout the kiln, stabilizing the internal temperature. Having top and side elements in a glass kiln keeps temperature differences within a glass project uniform and prevents cracking. Sometimes glass kilns are top firing only, and based on the size and materials in the kiln, that can be adequate for the heat demand.
Finally, glass kilns always have a digital controller allowing for multiple ramp and hold segments for heating, cooling, and stabilizing temperatures throughout the firing process.