An infinite switch is part of a control circuit that turns the heating element on and off in order to maintain the temperature with in some specific range around the value you want.
A thermostat in the kiln senses the temp and feeds a voltage to the infinite switch which is actually a variable resistor. When the voltage and the resistance of the infinite switch reach a balance point that will turn on ( or turn off ) a relay that allows the heating element to heat up.
Replacing the infinite switch ( a variable resistor ) with an on / off type of switch means the kiln will not have a control system anymore and it will either be always on or always off until you change the position of the switch.
Baby sitting that switch will be both exciting and boring when you use it that way.
The exciting part comes when you forget to turn it off the second time.
Parts are relatively inexpensive.
Insurance will not cover damages to your house when they find out you bypassed this switch.
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