Compact SS Solar Water Heater high quality 1.CE ,ISO9001.CCC 2.5 years ... solar vacuum tube, water tank, stand. 2. Using solar vacuum tube is very high efficiency.3. The complete system ... 4mm colored steel or 0.4mm stainless 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 ...