... Solar Collector: 1,Aluminum alloy shell2,Heat pipe vacuum tube3,Nylon vacuum tube holder4,Silicon aluminum&polyurethane foam insulation5,Galvanized steel ... flat roof and slope roof2,Employing sliding way for the frame ,mucheasier for installation,especially suitable forEuropean-styled houses3,Still ... be used for solar water heater or solarair condition. vacuum tube heat pipe pressurized solar collector