high efficiency U pipe solar collector

U Pipe Solar Collector Features : ● The vacuum tubes absorb the solar energy and transfer into the heat energy , then pass it to the U pipe, it can get high temperature. ● Since there is no water in the tubes itself, the tubes will not break in winter ● The system is reliable and efficient. ● The collector is mountable on sloped or flat roofs or on a veranda. The installation is the most flexible since it can work well in any installation angle. ● It can be combined with an