... easyly installation 3. energy-saves LC-P002 pressurized vacuum tube Solar Energy Project Specification:1) Vacuum tubes: Φ47 x 1,500mm, Φ58 x ... x 2,100mm2) Vacuum tube size: 15, 16, 18, 20, 24, 26, 28, 30, 363) Automatic controlling system with advanced science and ... technology4) The hot water system fitting for families and work units5 ...