solar water heater *CE,ISO9000,ISo14001 *high efficient vacuum tube *rapid heating transfer solar water heater*CE,ISO9000,ISo14001*high efficient vacuum tube ... tube solar collector: size: 47mm,1500mm,/58mm,1800mm, tube quantity according the tank capacity,copper pipe: material purple copper,glass tube ... work with work station,make a full system completely autumatic, you can uae hot water anytime, ...