... heating efficiency easy installation. How non-pressure solar water heater works1. Nonpressure solar water heater of all glass evacuated tube ... 0.4mm2) The material of outer tank: galvanized steel plate,thickness,0.31mm3) Brackets or support :alluminum alloy or ... onCertificates: ISO9001 ,CCC and CE,SGS,SRCC,EN12975 and solar kermarkSolar hot water heating system optional accessories1. Assistant tank: ...