Tubular heaters are a heat sources which are versatile and have an extensive usage field in industrial, commercial and scientific applications, Tubular heaters are composed by metal tube (sheath), resistance wire, MgO insulation powder and connection materials. They can be designed in various electrical powers, voltages, tube diameter, tube length, connection materials and tube (sheath) materials. Most important and useful  characteristic of tubular heaters is lithenes and it can be soldered or welded to all requested metal surface.