Buying A Kiln

When buying a small kiln, look at the manufacturer´s additional items you can purchase for the kiln. If you can buy an extra ring, will it have an element for heating the extra area? My first kiln was an Evenheat with inside measurements of 9x11 inches. I could fire a doll with arms to the wrist and legs to the ankle (Kitten), but not my llama. I purchased an extra 4" ring, which did not have any elements. The kiln would not fire to cone 6. The inside area was too large for the elements to reach the necessary temperature. Seven years later that kiln is still working and I´m glad I have it, but even happier that I also have a larger one.