... of solar vacuum tube, heat pipe, water tank, stand, P/T valve. 2. It is very high efficiency ... colored steel or 0.4mm SUS304-2B .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 ... degree, 38 degree, 45 degree.P.S. 1. Controller can display the temperature, water level ...