... 1)High pressure and high suction 2)key part of solar water heaters,solar collector 3)well-structured,reasonable ... ± 2%Maximal Temperature190 °C 1000W/m2Packing PaperWorking LifeYear15Pls read the specification carefully, for other questions you want ask, kind send ... we are manufacturer and the price we can insure the most reasonable, so the quality and after service. The scale of flat solar collector