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How to descale the vacuum tube solar water heater?

Views:2     Author:Site Editor     Publish Time: 2019-12-29      Origin:Site

The vacuum tube type solar water heater is composed of a heat collecting tube, a water storage tank and a bracket. The heat collecting tube can directly convert the solar energy into heat energy, and the heat collecting tube utilizes the working principle of the hot water floating on the cold water sinking, so that the water can microcirculation, so that The purpose of heating is achieved. Vacuum tube solar water heaters use tap water, which will produce a lot of dirt, so it is definitely necessary to clean up, otherwise it will cause a lot of harm. So why do you get dirt? What harm does the dirt do not clean? How to remove dirt? This series of questions will be displayed at the bottom of the article.


List of content for this article:

¡  Scale cause

¡  Scale damage

¡  Cleaning descaling

¡  Conclusion

Scale cause

The vacuum tube solar water heater is used for general tap water. The water contains minerals such as NaCl ,MgCl2 ,CaCl2. In addition, there are soluble gases such as CO2 and O2, and NaClO disinfectant components. The content of tap water in different regions is different, but after the process of heating, cooling and recirculating heating will cause some insoluble matter in the tap water to precipitate and form scale. The density of the scale is much higher than that of water. Over time, the scale in the inner wall of the water tank and the vacuum tube is formed and adheres to the inner wall. Scale is formed.


Scale damage

The damage of the fouling of vacuum tube solar water heaters are:

① Scale affects the heating efficiency, thicker scale deposit will directly lead to the increase of heating time, reduce the efficiency of water heater use, if the weather is not good, the use of electric auxiliary heating will also lead to an increase in electricity consumption.

② Scale accumulation causes the water temperature to rise slowly, affecting the highest temperature of hot water in the water heater and reducing the comfort of use.

③ The accumulation of scale easily leads to blockage of the connection between the upper and lower water pipes and the water tank, and the water supply is not smooth, which affects the ease of use. 

④ The accumulation of scale affects the quality of hot water, and is sensitive to some skin, and even damages the skin. 

⑤ Scale accumulation affects the heat dissipation performance of the vacuum tube, and the most serious will cause the vacuum tube to blast due to heat dissipation, which jeopardizes safety. 

⑥ Scale is not regularly cleaned and removed, affecting the service life of solar water heaters, and the introduction increases the cost of bathing for consumers.


Cleaning descaling

The steps of removing the dirt from the vacuum tube solar water heater are as follows:

① The solar inlet is opened and the descaling liquid is poured. The dosage depends on the capacity of the solar water heater.

② Pour the descaling solution and let the water heater naturally circulate for about half an hour. So that the descaling liquid can be evenly contacted to all parts of the water heater.

③ Open the drain port and drain the descaling solution. After the water tank is filled again, the water is circulated once. Pull out the vacuum tube

④ Vacuum tube scale preliminary cleaning out

⑤ Vacuum tube separate cleaning descaling

⑥ Descaling solution containing scale in vacuum tube

⑦ Times to clean the vacuum tube for descaling

⑧ After descaling, install the vacuum tube and adjust the system. Add water and to rinse, and the cleaning is finished.



Vacuum tube solar water heaters need to clean, otherwise it will cause a lot of harm. Then remove the dirt, it is best to use the water in the water heater the night before. The next morning cleaning, will not cause a large amount of heat in the vacuum tube; the descaling agent is best to use dilute hydrochloric acid liquid for descaling. Bring gloves to prevent the vacuum tube from suddenly smashing and scratching your hands or burns. After the cleaning is completed, test the water in the system to ensure that the cleaning is finished after no problem.


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