Decide on kiln size. Some factors to consider:

• Max temperature needed
• Mains socket available (limits available amps)
• Max weight
• Min ramp rate
• Availability of material and components
• Top load/front load

These will drive the max wattage needed, internal size and the type of materials that can be used as the max temperature limits the range.

K26 bricks matched my max temperature requirements and angle iron was most economical to purchase for the frame build. The min. ramp rate suggested the oven should have some fiber lining to reach temperature quicker. Kanthal A1 wire could handle the temperature and weight was not much of a problem for me.

With a 10A/240V socket available, I opted for around 2000W as I could get an SSR, fuse holder/fuse, high temperature silicon wire and some terminal blocks that could handle the amperage fairly easily.

Calculate what size wire and how much is needed, used https://kruegerpottery.com/products/element_240v_16amp

The shape of the coil, width between windings and internal layout of coil are impacted by:

• Dept of grooves
• Number of mounting points in grooves
• Number of coils in parallel/series to limit the wattage
• Diameter of the wire
• Even heat distribution (assuming no coil on the door)

Used Fusion 360 to model the K26 bricks, layout the easiest manufacturing pattern and then play with coil layout on the model until it fit with minimum installation interference.