solar water panels It is a device which can well absorb the solar energy and transfor it into heat solar water panels1) It can withstand ... resistance: 25mm9) Tube standards: 14, 16, 18, 20, 24, 30, or 36 Heat Pipes with 58mm-1800mm or47mm-1500mm10) Manifold: outer ... , inner: rock wool with red copper pipe11)Frame:stainless steel or galvanized steel sheet