... 13) Tubes easily replaced if broken, can be used with broken tubes 14) Ideal for commercial solar water heating ... on the balcony or windowsAdvantages:1.CE,UL,ISO9001,CCC,Solar water heater with SOLAR KEY MARK certificate2.High efficiency, ... price, all the parts are made by our factory. With the same quality of products, we are cheaper than ... always be free. solar water heater/high quality system with CE