... pipe 15 years warranty 3.delivery:15 days 4.OEM split pressure solar water heater 1. that type have CE,ISO9001,CCC, certificates, completely ... market, work wirth work station, that together complete autumatic, and can work in bad weather(-30), if one tube is ... 5. hailstone: resistance 25mm, work principle the water tank have coil,connect with the solar energy, inside coil have special liquid for ...