... , borrosilicate glass 3.37) Solar working station8) With heat pipe: anti-freezing > -35 degrees centigrade9) Water capacity: 150L, 200L, 250L, ... to 80h13) Electric heater: 1.5Kw to 3Kw Solar collector(Heat pipe series)SC-H seriesModelSC-H-15-5818SC-H-18-5818SC ... boron and silicon content 3.3,Structure,Gradual change SS-AL-Nx/Cu selective absorption coating,Vacuum Degree,P<=5*10 ...