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Specification:inner tank material : imported SUS304-2B food grade stainless steel Outer tank material :high quality stainless steel Heat insulation of water tanks adopts polyurethane foam, thickness is 55mmBracket material :imported SUS403 or SUS202 stainless steel Vacuum tubes: 47mm*1500mm and 58mm*1800mmCapacity: a collector with 24 to 60 pieces vacuum tubesMany collector can be connected and work togetherIt can be connected with tank by circulating pumpIntercept efficiency: 93%Heat loss: 0.22w/m2kTemperature range: 38 to 99 degrees CelsiusHail resistance: 25mm Features:It is widely used for the solar central heating project, such as for the hotel, school, swimming pool who need plenty of hot water everyday.Strong adaptability ,high degree of automation,economical and pratical,environment conservation and energy saving .