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   SFM25Detailed Product Descriptionshentai SFM25 Features:1) Working principle of high pressure solar heater: utilizes the alternative     absorption coating on the inner surface of the vacuum tube, from the     high-temperature environment super-conduction tubes, leads the heat     to the water tank, and produces hot water2) Easy to use, also convenient to install3) Can be put in the courtyard, on the roof or balcony4) Inlet water hole connects to the tap water, and the outlet hole connects     to the tap water, and the outlet hole produces pressure hot water directly5) Working principle of low pressure solar heater: adopts the alternative     absorption coating to absorb the solar energy, heat the water in the     vacuum tube directly, through the cold hot water convection, changes the     solar energy into heat energy to store in the water tank:    a) Ad