... tube collector is two circuit system ,free of freezing and could be used all year .5.The metal super-conducting ... separately ,in harmony with the structure .9.The heat collector could be mounted on the balcony veranda,the southem wall ,sloping ... keymark,SGS,CCC3.Life span:Approximate 15 years 4.We can customize according to customers' requirement Certificates :CE,ISO9001,SRCC,Solar keymark,CCC,SGS,CCC ...