... vacuum tube,therefore no water in the tube,each tube can work alone,so the solar colletcor can work even ... daily average efficiency over 50%Start up quickly,the water is heated rapidly by heat pipe which will ... degreeCapacity 100L 150L 200L 240L 250L 300LCertification: SABS,CE,Solar Keymark, SRCC,ISO9001:2000Parameter Table-1 Place of ... connection(mm):1/2,3/4 compact pressure solar hot water