... approvaltesting 100% in houseAnnual capacity 1000,000setssolar hot waterSolar water heater,solar hot water,solar water heating,solar heatingModel: SL-CLSFeature:1) ... : Φ58×1800 heat pipe vacuum collector tubes ( no water in tube)7). Bracket: Aluminium alloy&thickness:1.0mm ... pressure: 1.2Mpa)Working principle:Installation Case: Solar hot water heating system,SRCC,Solarkeymark,ISO9001,100L~500L