... years warranty 3.delivery:15 days 4.OEM split pressure solar water heater 1. that type have CE,ISO9001,CCC, certificates, completely guarantee ... inside have copper pipe for exchange hot,high efficient,keep water more clear,3. this product most for europe market, ... 5. hailstone: resistance 25mm, work principle the water tank have coil,connect with the solar energy, inside coil have special liquid for ...