... easily replaced if broken, can be used with broken tubes 14) Ideal for commercial solar water heating applications 15) Can be installed on ... the balcony or windowsAdvantages:1.CE,UL,ISO9001,CCC,Solar water heater with SOLAR KEY MARK certificate2.High efficiency, Absorption rate: =93%, thermal ... fuel source (the sun's energy) will always be free. solar water heater/high quality system with CE