Split Pressurized Heat Pipe Solar Water Heater System 1. TU1 copper, heat pipe 15year guarantee 2. OEM 3. Fast delivery Specifications of Split Pressurized Solar Water Heater Panels Tube Number:15pcs 20pcs 24pcs 30pcs or costomizedvacuum tube type:58 X 1800mm Super-conduct copper heat-pipe in the vacuum tubeVacuum tube opearte without waterThere is a copper flow way in manifoldManifold of ...