Using Wafer Heater in Dusty, Damp, or Demanding Settings

https://thermal-engineering.scriblorax.com/posts/choosing-a-wafer-heater-for-your-application-a-practical-checklist

Many heating problems look like a power problem at first. In practice, the cause may be contact, heat loss, sensor position, or poor fit. A wafer heater works best when these parts are planned together