Heat Pipe Solar Thermal Collector Endures climate feature: Thermal efficiency is good in the whole year ,Hail resistance: 25mm heat pipe collector: Keymark(EN12975)solar thermal heating collectors system 15-30tubeEuropean standards,Could be used for underfloor heating systemsize:58/1800,47/1500, heat tubs,100-850L,have CE,ISO9001,CCC,certificates, can install anywhere, offer OEM serviceManifold: ...