Tubular heaters are used in nearly every section of the modern industry.
Due to their modular design and the stability of a high-compressed heating element it is possible to heat almost any medium. The boundary conditions like operating temperature, surface power, medium and ambient conditions are decisive for choosing the right material. The maximum surface power of the different tubular heaters is equivalent to the material and linked to the intended application. Following are rough values for surface power:
Water (resting -100°C – 8 to 14W/cm²), oils (thin, resting - 100°C - 3W/cm²), air (0,5m/s – 100°C - 4W/cm²). Tubular heaters are available with a diameter of 6.5mm, 8.5mm und 11mm and with tube sheathing made of copper, steel and stainless steel 1.4541, 1.4571, 1.4876, 2.4858.

Following are rough values for the maximum admissible surface temperatures of the tube sheathing and have to be evaluated on a case-by-case basis:
Copper 250°C, steel 400°C, stainless steel 750-900°C.