... Red copper(TU1) heat pipes. Split Solar Water Heater SystemModel: JHC-5818The characteristic of Heat Pipe Solar Collectors1) Reliable, efficient, twin-glass evacuated ... save your fuel cost.The Principle of ThermosyphonMetal Heat Pipe Solar Collector consists of a vacuum tube, a heat pipe, ... heat is a continuous circulation as long as the collector is heated by the sun.Product Applications1) Domestic, ...