thermistor is just a resistor that has resistance varying with temperature. often that relationship is linear over a reasonable range, like with Pt100, and you can probably get away with using potentiometer instead. that said you have to figure out what you have there, because there are many options

I don’t think anyone designed it to do that, becsuse 220C is like 100C above critical point of some common refrigerants (evaporation/condensation stops being a thing at this point and heat can be transferred only from hot to colder and not very efficiently)