... approval testing 100% in house Annual capacity 1000,000sets solar hot water Manufacture since 1987SRCC,Solarkeymark approvaltesting 100% in ... capacity 1000,000setssolar hot waterSolar water heater,solar hot water,solar water heating,solar heatingModel: SL-CLSFeature:1) Collectors combined ... 40mm~50mm4). No.of Copper coils: double coils or single one (copper pipe: OD:12mm,thickness:1.0mm;)5). ...