solar water heater system, size,58/1800,47/1500, have CE,ISO9001, ... ,make a full system completely autumatic, you can uae hot water anytime, high efficient,and no-pollution.3. installation: instal ... manual instruction.4.use copper pipe for transfer hot, more high efficient, and water more clear,because no water in tube so ... can designed more details pls contact us anytime! solar water heater collector