... Tube Solar water heater: CE certified, high efficiency, TIG welding, easy installation, reliable quality, good finish. Super ... stainless steel CE certified, high efficiency, TIG welding, easy installation, reliable quality Solar Water Heater Vacuum Tube ... Dia.: 310mm, 360mm, 500mm;Inner tank welding: Double sides argon protection welding. No corrosion;Outer tank shell: Stainless ...