选择可靠的产品很重要家用太阳能热水器的关键部件就是真空管。真空管质量的好坏直接影响到产品的性能。选购时应仔细观察真空管内玻璃管上的涂层,这层涂层叫太阳能选择性吸收涂层,一般都是黑色、深蓝色或深灰色。质量好的涂层颜色均匀,膜层无划痕、无起皮或脱落现象,玻璃上也没有结石或节瘤现象,支撑内玻璃管的支撑件放置端正、不松动。真空管之间的管间距。一般两管的中心距在70毫米左右为宜。其次是热水器内胆。目前,市场上流行的太阳能热水器水箱内胆分不 Choose a reliable product is very important Household solar water heater key component is the vacuum tube. The quality of the vacuum tube directly affects the performance of the product. The purchase should carefully observe the vacuum tube glass tube coating, this layer is called solar selective absorption coating, usually black, dark blue or dark gray. Good quality coating color uniform, scratch-free film, no peeling or peeling phenomenon, there is no stone or knot on the glass phenomenon, support the glass tube support placed properly, not loose. Tube spacing between vacuum tubes. The general center of two tubes at about 70 mm is appropriate. Followed by water heater liner. At present, the popular solar water heater tank liner is not