Solar water heating system 1.Unpressurized solar project 2.Vacuum tube size:47*1500mm 3.Solar water heating system for home Solar water heating system 1. Unpressurized solar project 2. Vacuum tube size: ø 47*1500mm 3.good quality4. OEM&ODM 5.55mm thickness polyurethane foam 6. Fram material: 1.2mm thickness stainless steel 7. CE, SRCC, SGS, Solar Keymark, ISO9001: 2008