separate solar water heater beautiful design, high quality resonlable price CE,CCC,ISO certificate Manufacture separate solar water heaterWater Tank:1,Inner ... material4,P/T relief valve ,electrical heater element with terminator5,Heat exchanger:20m long,12mm diameter,1mm thickness ... adjustor&Timing water supplyVacuum tube:1,the pipes are made of advavced superconductive oxygen-free copper heat pipes2 ...