... ,ISo14001 *high efficient vacuum tube *rapid heating transfer solar water heater*CE,ISO9000,ISo14001*high efficient vacuum tube*rapid heating ... ,make a full system completely autumatic, you can uae hot water anytime, high efficient,and no-pollution.3. installation: instal ... pipe for transfer hot, more high efficient, and water more clear,because no water in tube so can work in bad weather condition ...