.Certificate: SRCC, Solar keymark ,EN12975,ISO,SGS,CE,CCC 2.Lifetime:15years 3.Deliverly time:10-15days 4.Best performance solar water heater ... Type: Direct-PlugInstallation: FreestandingHousing Material: Stainless SteelCertification: CE, ISO ,SGS ,solar keymarkCapacity: 300Place of Origin: Jiangsu China (Mainland) ... , from 24 tubes to 36 tubes. solar water heater(SRCC,SOLAR KEY MARK,CE,ISO9001,CCC)