... time:within 7days 4.$100-$300. Copper Coil Solar Water HeaterWork principle:The water in water tank is for heat preservation and circulation. The ... hours water supply on condition that pipeline is working.9. Life duration: 15 years, warranty: 5 years10. CE, ISO9001, CCC,EN12976 approved11 ... , America, Africa clients better, at work in Europe work time. Solar Water Heating System