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Features:1) High heat effectiveness: higher than all-glass evacuated solar collector tube by 15%2) Heat pipe conduction: successfully prevents defects of tube breakage and low power output caused by water fouling and deposits or dust and sand3) Prevents tube from being easy breaking caused by volume expansion when water freezes in frigid season4) Low thermal capacity makes the tube start up quickly5) Energy output within only 2 minutes of sunshine6) Insulation temperature can reach 250°C, average heat efficiency can still be more than 50%; even under -50oC7) High efficient selective absorptive coatings and vacuum heat insulation technology ensure the tube has higher heat output in cloudy weather and in moist areas, especially in winter8) Solar collecting plate is sealed inside a high quality borosilicate glass tube with 5 x 10-3pa of vacuum, to stop corrosion; even in moist conditions