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Pressurized Solar Water Heater
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The vacuum tubes absorb the solar radiation and convert it into the heat energy, and heat the water directly in the tube and the heated water goes up into the storage tank, at the same the time the cold comes down, forming the circulation, and thus the temperature rises up, the water in the whole system gradually is heated .The coldwater can be supplied into the tank automatically by the small tank. When the tank is full of water, the small tank will stop work. So we just need to keep the cold-water inlet open, the system can supply the water by itself.
