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What is the difference between the Caldera and FireFly kilns?

The Lid and Bottom

You can separate the firebrick top and bottom from the Caldera. This makes the kiln modular so that you can add a collar, which is a kiln section that adds depth to the firing chamber. The collar is inserted between the kiln bottom and the Caldera. We have three types of collars:

The blank Caldera-X, which adds 4 1/2" of depth

The Caldera-BC, which adds 4 1/2" of depth and includes a bead door for annealing

The Caldera-E copper enameling collar.

The FireFly has a built-in brick bottom and a hinged lid. A collar cannot be added to the FireFly.


Both kilns can be ordered with the optional 2" x 2" high-temperature glass window, which is centered in the lid. The window lowers the kiln's maximum temperature to around 2100F.


Both kilns have a safety switch, recessed element grooves, L-notched corners, case tighteners, and the Sentry Xpress with Cone-Fire and 8-segment Ramp-Hold modes.

Both kilns are rated to 2350F and plug into a 120 volt, 5-15R wall outlet.

Both kilns are 8" x 8" inside; the Caldera is 6 3/4" deep, and the FireFly is 4 1/2" deep. The Caldera, without collar, offers a 2 1/4" deeper firing chamber.

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