... 10days 4,High Quanlity&Reasonable Price vacuum tube solar water heater Certification:Have passed SRCC,CE,ISO9001:2000,CCC, ... rate: ≥93%,thermal radiation rate:≤6% Temperature when ecposed to sun without water:250 degree ,2.5 hours to ... boiling if using tube.Resist 25mm hall,life scale can last 20 years. 6) Type ... .323025026/63 colour steel vacuum tube solar water heater