... acid rain, seawind erosion by salt and bad weather conditions5) Stable and reliable performance, well wind ... Connection Type: Direct-PlugInstallation: FreestandingHousing Material: Stainless SteelCertification: CE, ISO ,SGS ,solar keymarkCapacity: 300Place of Origin: ... pressure: No-pressuriedPackaging & DeliverySpecificationssolar water heater (1)CE,ISO,SGS ,solar keymark (2)Low pressure,stangard ...