Split Solar Water Heater System.1) Reliable, efficient, twin-glass evacuated tubes. 2) Red copper(TU1) heat pipes. Split Solar Water Heater SystemModel: JHC-5818The characteristic of Heat Pipe Solar Collectors1) Reliable, efficient, twin-glass evacuated tubes. 2) Red copper(TU1) heat pipes, The water is heated by the heat pipe rapidly.3) There is no water in the vacuum tube,so the tube will not ...