I think that one bit of important info is missing when talking about the Olympic / Paragon kilns with a lid element that can go to ^10. It is my understanding that the kilns with lid elements are dual media kilns, the lid element is used for low temp glass work but when firing above that it is not used. I'm thinking this is the optimal use for a lid element. It just doesn't make sense having a lid element for going to ^6, let alone ^10. There is a reason electric ceramic kilns don't come with lid elements.
DM2023HE 240 or 208 volt Dual Media for firing ceramics and equipped with a lid element for fusing glass
Inside dimensions: 30" wide x 20" front-to-back x 24.5" deep, fires to cone 10/2350°F
Dual Media kilns are designed for the individual or business who works with multiple media. The dual design for reaching high firing temperatures for stone ware, pottery, ceramics and the lid element for fusing glass provide the versatility needed. Oval dual media kilns are built with a 2" blank brick row in the first section of the kiln to protect the elements when loading and unloading the kiln. All Dual Media models high fire to 2350°F and have a lid element to fuse glass.
From the Paragon site re one of their Janus kilns with lid element:
The Paragon Janus-23 can fire both pottery and glass. Heating elements are mounted in the lid and sidewalls. Select between glass and pottery with the flip of a switch. With the switch in the glass position, heat comes from the top elements and the middle sidewall element. With the switch in the pottery position, heat comes from only the sidewall elements.
In the glass mode, fuse and sag large glass projects placed on a single shelf. In the pottery mode, fire to cone 10. You can also fire several shelves of smaller glass pieces using the pottery mode.
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