... heating element/electric heater Quality certification :TUV,UL Electric Stainless steel heater pipe Features:1. The structure of tubular electric ... , etc. Technical data5)Insulation materials: magnesium oxideTube Material: Stainless steel seamless pipe, welded pipe, copper, yellow brass pipe, carbon ... steel pipeCommon diameter:Φ22,Φ20,Φ18,Φ16,Φ14,Φ12,Φ10,Φ ...