... energy 3.Environmental protection 4.Durable passive roof top Solar water heater with assistant water tank FEATHERS: 1. The ... preservation: 72 hours.7. Optional accessories: assistant tank, electrical heater.8. 5 years warranty. MaterialEvacuated tubeHigh borosilicate glass, with ... parameres Y=220-260./KWTotal Weight 87KGS87KGSCertifications Solar Keymark, SRCC, SGS, CE, ISO9001Warranty 5 years5 ...