... solar energy collector 1.Higher efficiency 2.Hot water supply and space heating 3.Cold area suitable 4.ISO9001, CE Heat pipe solar ... copper heat exchange rate), heat exchange rate is up to 99%. The startup is fast, when ... , make higher operation pressure, test pressure up to 11kg/cm2;(4)No water flow in ... can get heat energy even under cloudy weather;(6) Module design, easy to be installed and shipped. It ...