... certification 4.Best price with high quality Pressurized Solar Water Heater.1,vacuum tube length:47/1500mm,58/18002, ... 5,Insulation:foaming polyurethane thickness:50mm or 55mm6,Optional electric heater:220v-240v 1500w/3000w7,frame material :202 stainless ... furnished in good style .5,Tank is equipped with electric water heater setting,automatic temperature controller.6,With increased anode magnesium ...