The firebrick corners are fitted together with L-shaped
notches for extra strength. This type of joint lasts longer than the
butted joint and the "picture frame" mitered joint found on
The Type-K thermocouple, which reads the firing chamber temperature,
is protected in a high-nickel stainless steel sheath for long life.
A heavy steel base supports the reversible brick bottom. No extra
stand is needed. Use the switch on the front panel to turn off power
to the controller when the kiln is not in use.
Both sides of the lid and top rim of sidewall firebricks are hardened
and sealed with a refractory coating to protect the ware from dust.
The firing chamber, including the lid and bottom, is made of 3"
thick firebricks, 20% thicker than standard 2 1/2" bricks.
The Caldera XL has dual mechanical relays for extra reliability. They
turn on power to the elements. Two relays last longer than the
single relay of competitive kilns because of the reduced amperage
going through each relay.
Optional Shelf Kit: 2 C-7 Shelves, 4 - 1" long, 1" wide
Square Posts, 4 - 3" long, 1" wide Square Posts, 4 - 5" long, 1"
wide Square Posts, 1 lb. Bag Kiln Wash