Vacuum Tube Solar water heater: CE certified, high efficiency, TIG welding, easy installation, reliable quality, good finish. The following are the features of our vacuum tube solar water heater:CE certified, high 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; ...