... warranty 3.delivery:15 days 4.OEM split pressure solar water heater 1. that type have CE,ISO9001,CCC, certificates, ... hot,high efficient,keep water more clear,3. this product most for europe market, work wirth work station, that together complete ... water tank have coil,connect with the solar energy, inside coil have special liquid for recirculate exchange hot, all that controlled by work station ...