Compact Solar Water Heater with al-alloy brackets 1.CE ,ISO9001.CCC 2.5 years ... system consists of solar vacuum tube, water tank, stand. 2. Using solar vacuum tube is very high efficiency ... 4mm colored steel or 0.4mm galvanized steel.3. Stand: galvanized steel with painting,or Aluminium alloy, or ... heat insulation layer: 50~60 mm polyurethane foam.5. Stand angle: 15 degree, 20 degree, 25 degree, 30 ...