... ,CCC,Solar water heater with SOLAR KEY MARK certificate2.High efficiency, Absorption rate: =93%, thermal radiation rate: ... are made by our factory. With the same quality of products, we are cheaper than others4.Cloudy ... 24, 30 tubes7.It is applied in various places8Assured quality, fast delivery9.Endless hot water and no need waiting ... will always be free. solar water heater/high quality system with CE