... -40 degree 3.OEM provide Split pressurized Heat pipe solar collector heating System1,Size:58/1800,47/1500 2,CE, ... for transfer hot, more high efficient, and water more clear,because no water in tube so can work in bad ... can designed like swimming pool heat system. Heat Pipe Solar Collector Detailed SpecificationItemPartsDescriptionManifold boxManifold Outer Case1001 Aluminum alloy with plastic spraying ...