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SFBmodel discards the traditional appearance and the bothering maintennance.at the same time,it creates the time of standing pressfure.it is especially suitable for the heating system of projections,schools,hospitals and hotels and so on. Working theory:1) Solar radiation is absorbed by the solar tubes and converted into     heat. Heat pipes then conduct the heat from within the solar tube up     to the header pipe2) Water is circulated through the heater, via intermittent pump     cycling. Each time when water circulates through the heater the     temperature is raised by 5 to 10°C (9 to 18°F). Throughout     the day, the water in the storage tank is gradually heated