Vacuum Tube Solar water heater: high efficiency, TIG welding, reliable quality, good finish, competitive price Features of our vacuum tube solar water heater:CE certified, igh efficiency, reliable quality, inner tank TIG welding, super stainless steel, easy installation, competitive price.Vacuum Tube: Dia.47/1500,Dia.58/1500, Dia.58/1800,Dia.70/2000;Vacuum Tube qty: 12pcs, 15pcs, 18pcs, 20pcs, ...