... ,High Quanlity&Reasonable Price vacuum tube solar water heater Certification:Have passed SRCC,CE,ISO9001:2000,CCC, solar Keymark ,SABS and other certificationFeatures:1 ... %,thermal radiation rate:≤6% Temperature when ecposed to sun without water:250 degree ,2.5 hours to boiling if using tube ... /76SP470-1800/58-304.323025026/63 colour steel vacuum tube solar water heater