如何选购一台质优价廉的太阳能热水器? 首先是选真空管,真空管是太阳能的接受装置,其质量好坏至关重要。一看,看是否有白头和结泡。白头是指真空管漏气使管端发白,结泡是指真空管玻璃上有气泡,使用时会使管壁受热不均,影响使用寿命。二摸,用手抚摸真空管的管壁,看管径是否光滑平整。三查商标,清华管、华杨管、山东泰安管是国家定 How to choose a quality and cheap solar water heater? The first is to choose the vacuum tube, vacuum tube is a solar receiver device, its quality is critical. Look to see if there are whiteheads and blister. The white head refers to the vacuum leak of the vacuum tube to make the tube end white. The blister refers to the air bubbles on the glass of the vacuum tube. When used, the tube wall will be heated unevenly and affect the service life. Second touch, touch the wall of the vacuum tube with your hand to see if the tube diameter is smooth and flat. Three check marks, Tsinghua management, Huayang management, Shandong Tai’an control