... evacuated tube solar collector Hight absorbance and performance, antifreezing, fashionable design, Keymark, CE, Main features of all glass evacuated tubes solar ... 20 pieces Collector area: 2.88m² Tube vacuum degree: 5 x 10 to 3Pa Tube absorption: >88% Tube heat loss: <8% Working pressure: ... 8 to 9L for single pipe about 165L for total Loading quantity: 20ft container: 86 pieces 40ft container: 166 ...