What are the advantages and disadvantages of the material of the collector tube of Haier flat solar water heater?

The split all-weather antifreeze works normally at MINUS 30 degrees, the pipeline is not frozen or blocked, and the whole machine is more reliable. Compared with the first cycle, it overcomes the defect that the water tank loses heat due to the anti-freezing cycle at night, and there is hot water in winter. Under normal circumstances, when the temperature of water tank is above 45 degrees in winter, users use a more intimate and efficient flat plate heat collector with selective absorption coating, which has high absorption rate, low emissivity, anti-freezing at MINUS 30 degrees, no blockage, and the whole machine is more reliable. Compared with one cycle, it overcomes the defects that the anti-freezing cycle at night causes the water tank to lose heat and there is hot water in winter. In general, the temperature of the water tank is above 45 degrees in winter. Users use a more intimate and efficient flat plate collector, which is installed separately, with high absorption rate and low emissivity. The perfect combination of flat plate collector and roof embodies the integrated protection of electric auxiliary heat, over-temperature, over-voltage, electric leakage and dry burning.