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Description:
Description:
Non-pressurized vaccum tube solar water heater works with pressure up to 0.2 Mpa and can normally work in all climate. The absorptive coating is ALN/ALN-SS/CU. This coating has high absorbing ratio(0.94) and low emission ratio(0.6). The heat efficiency is 0.64. The life span of the vaccum tube is 15 years. The vaccum tube ia made of borosilicate 3.3.
