... copper tube: 1.Copper tube with UL,CE approval. 2.Copper,with copper flange 3.Copper tube for Water parts 4.Copper tube part With Flange Water heater element Copper tube : (1). Water heater element copper tube(2 ... with SUS304 flange With Flange Water heater element Copper tube:Tubular heaters are available in Copper, SS304, SS 310, SS316, SS321, ... .8W/cm2 With Flange Water heater element Copper tube