Common Failure Causes in Glass Heater and How to Prevent Them

https://thermal-tech-hub.nexorafield.com/posts/beginner-s-guide-to-semiconductor-heater-what-to-know-before-you-specify-one

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 glass heater works best when these parts are planned together