... be used in all climates 3) Reliable and efficient with twin-glass solar tubes 4) Copper heat pipes for rapid heat transfer5 ... easily replaced if broken, can be used with broken tubes 14) Ideal for commercial solar water heating applications 15) Can be ... the balcony or windowsAdvantages:1.CE,UL,ISO9001,CCC,Solar water heater with SOLAR KEY MARK certificate2.High efficiency, Absorption rate: =93%, ...