Solar energy water heater although energy conservation and environmental protection, but on the market at present product quality is uneven, consumer is when the choose and buy should pay attention to compare, lest enter illegal businessmen hooks trap. More specifically, should pay attention to the following eight points:
A KanRe performance indicators. Average daily efficiency, the higher the better, the average heat loss coefficient as low as possible.
2 look vacuum quality. Household solar water heater of the key components is the vacuum tube, vacuum quality affects the performance of our products. When the choose and buy should be carefully observed in the vacuum tube glass tube, the coating on the layer called the selective absorption coating, because solar each manufacturer production process is different, coating color makes a difference, but are generally black, dark blue or dark grey. Good quality coating color uniformity, membrane layer does not have Nick, without peeling or falls off phenomenon, glass and there are no calculi or section tumor phenomenon, support within the glass tube support thing placed right, don't loose.
Three see vacuum between pipe space. The center distance of general two tube in 70 millimeter advisable.
4 look into the water heater tank. At present the market fashion of solar energy water heater of the water tank points stainless steel inner and enamel bladder two kinds. Stainless steel container according to process points bite and welding bladder. According to the material thickness thin and thick stainless steel divided again. According to the stainless steel grades and points sas304, sas403 etc. Bite process quality are not guaranteed. Welding of thick stainless steel (70.5 mm) HanKou by welding processing after the internal structure of changes have occurred, extremely easy corrosion, life also difficult to have the guarantee, general life in 5 years. Welding thin stainless steel live shorter, and easily pumping flat. Enamel bladder were divided into ordinary enamel, senior enamel, titanium blue enamel bladder, ordinary enamel tank USES is ordinary enamel with enamel appliance enamel today, life in about two years. Senior enamel bladder using chemical enamel evolved, much better than ordinary enamel, general life in 5 years. Titanium blue enamel bladder adopts imported enamel, acid and achieve gradeaaa, dense with degrees than class I, more than European standards, life in 15 years.
Five see water heater structure. Water heater structure refers to the connections between tube and cistern. Now on the market have 2 kinds, 1 kind by silica gel ring seal, another kind is copper jacket structure of metal seal. Silicon ring seal of solar water heaters and maintenance convenience, easy to leak, once leaking, the whole solar water heaters would be crippled cannot use. Sheath seal solar water heater is because the use of heat pipe vacuum tubes, whole double-wall can withstand the pressure, high temperature resistant, metal sheath not easy ageing, use maintenance is very convenient.
Six see the reliability of auxiliary heating, including life and safety two aspects. Electric auxiliary heating does give consumers brought convenient, can guarantee to make every day to wash bath, but the choice is bad, also can give users the life safety of dangerous. Security depends on the quality of electric heating element and whether guarantee not stem burn two factors. Before a factor requirement manufacturer nestled quality, after a factor and structure is closely related to quit burn must ensure that electric heating element long-term immersion in water. This requires the structure of water heater for copper tube for heat pipe jacket structure, vacuum tubes, using method must be against water type.
Seven see water heater use convenient or not. So-called convenient or not, namely can automatically sheung shui, at present the market on many of the automatic sheung shui concept, what "automatic water meter" "computer control instrument" "automatic sheung shui vice tank" etc, this kind of product is all all-glass vacuum tube water heater, the water tank with thin stainless steel container, because the machine can't confined, only by auxiliary instrument to realize. The real automatic sheung shui, namely confined water heater, need not against water meter can be realized this function.
Eight see after-sales service. Had better choose well-known trademark products and after-sales service is good dealer, because home
solar water heater is durable consumer goods, and usually is installed on the roof, once a fault, so much more difficult for your users to resolve their after-sales service must be guaranteed.
