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A. Two layers of copper tubes inside the vacuum pipe, theres no contact between vacuum pipes      and water. So, its no influence to the whole system when one vacuum pipe is broken.B. The solar collectors can be installed in any angle, from 0 degree to 90 degrees, on Flat    roof, Slopy roof, and vertical wall, and the conversion efficiency is same.C. The copper tubes has good contact with Aluminum fin inside the vacuum pipes,      to assure better heat transfer.D. More suitable for separate solar heating system, which has advantage on high-building     installation.E. The overall conversion efficiency is 5-10% higher than that of traditional solar collectors.      And the system can be used in all kinds of climates.