... 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 HeaterVacuum Tube: Dia. 47 ... tank Dia.: 420mm, 470mm 600mm;Insulation material: High pressure PU foaming with thickness of 55 mm; ...