How to distinguish the solar water heater
Three also pay attention to the diameter and length of the vacuum tube, which directly determines the size of the vacuum tube heating surface, the distance between the vacuum tube, the general two tube center distance is about 75mm. The best choice to have the ability to produce vacuum tube solar brand, so in addition to quality assurance, the better. The tube is dark purple (low light when the light shines like black, look under the pan purple). Usually dark blue.. Antarctic tube is mainly in addition to heat absorption effect.
Two is the use of eye observation, the purchase should be carefully observed in the vacuum tube glass coated tube, vacuum tube using the inferior solar energy, its coating only 9 layers, the 12 layer, good quality coating color uniformity, the film is black, no scratches, no peeling or shedding phenomenon, glass there is no stone phenomenon, supports the glass pipe in the correct place, no loose.
Methods to identify the merits of the vacuum tube with a touch, feel if the temperature is normal, slightly cooler, which indicates that the vacuum tube for quality product; if feel hot, the vacuum tube quality is not good, it is also in the heat in the absorber, the effect will be relatively poor in winter;
