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Solar Water Heater
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Faq
 
1. How to tell a good solar water heater from the inferior ones?
2. How does an evacuated tube solar water heater work?
3. Why Kaidun Solar Water Heater is more expansive than the heaters of other brands?
4. What is the advantage of solar water heater over other heaters?
5. What are the advantages in quality that Kaidun product have?
6. What should be noticed when input water into solar water heater?
7. How can I use solar water heater if there is no tap water?
8. How to use solar water heater in area with fixed water-releasing place?
9. How to use solar water heater cloudy or rainy days?
10. What should be noticed when using solar water heater?
11. How to tell that the water in the solar water heater is fully filled?
12. How to protect the evacuated tubes?
13. What should be noticed when using the electric heater?
14. What are the features of the raw material of Kaidun solar water heater?
15. How to tell whether an evacuated tube is good or not?
16. If there is already a gas or electric heater, can I install a solar heater also?
17. How long is the guarantee period of your product?
18. What does the main part include? What do the auxiliaries include?
19. What if the solar water heater breaks down after the guarantee period?
20. Will the maintenance service be charged in the guarantee period?
21. How to use a solar water heater?
22. Is the installation free or not?
23. What are the usual methods to prevent frostbite on solar water heater?
24. What parts of the solar water heater should be carefully dealt with to prevent frostbite?
25. What are the components of a Solar Water Heater?
26. What are the advantages of solar water heater?
27. How many years do you guarantee your products?
28. How big the solar water heater I need to buy?
29. What’s the temperature of the water we can get by using your solar water heaters?
 
1. How to tell a good solar water heater from the inferior ones?

Solar water heater consists of three parts: heat-collecting part, heating-storing part, and bracket. A. The quality of heat-collecting part is decided by the absorbing ratio and radiating ratio, this depends on the material and processing techniques. Kaidun has a group of competitive technicians, and we can guarantee the quality of our product. B. The heat-storing part is the storage of the solar water heater, there are three indicators for its quality: a. whether it leaks or not? b. The welding method of the interior tank, the strength of welding and whether the material is anticorrosive. c. The insulation layer decides the how long it can keep the water warm, in cold regions, thicker insulation layer is needed. C. The bracket supports the main parts, and keeps the heat-collecting part in the right position. It must stand as long as the other parts. It should be strong enough and anticorrosive. You could tell its quality by looking at the material, thickness and surface finish.

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2. How does an evacuated tube solar water heater work?

The solar water heater works in the way that the heat-collecting part gather heat and then store the heat in the tank. The heat collector works in the way that the selective coating on the interior tube can absorb energy from the sun and transform it into heat so as to heat the water in the tube. The hot water in the tube will go upward due to its smaller density, and the cold water in the tank will flow downward, thus, the water in the tank will circulate and the temperature will rise continuously.

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3. Why Kaidun Solar Water Heater is more expansive than the heaters of other brands?

The price of a product depends in several factors as raw material, processing techniques, etc. The principle of Kaidun choosing material is that: if the domestic material is good enough, we choose the best one; if the domestic material is not good enough, we choose the imported one. So the good quality of the product is decided by the good quality of the raw material. And the raw material is processed with good skills and techniques. So our products are both attractive and durable.

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4. What is the advantage of solar water heater over other heaters?

The solar water heater is a once-for-all investment. Although it is more expensive than electric heater or gas heater at the first installation, you don’t have to pay any more in using. What’s more, it is reliable and safe, no manual operation is needed. So, with everything considered, the solar water heater cost you the least money. If you are using an electric heater or a gas heater, you also need to pay for each shower.

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5. What are the advantages in quality that Kaidun product have?

Good quality evacuated tube is the key parts of solar water heater, Kaidun use only the first class evacuated tubes that are highly absorptive, highly durable to hot and cold weather conditions to collect heat from the sun. The interior tank is made of SUS304 stainless steel sheet, the insulation layer is made of foaming polyurethane, the bracket is made of aluminum alloy sheet or stainless steel sheet, so each part has a balanced working life.

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6. What should be noticed when input water into solar water heater?

As the temperature inside the evacuated tube can reach as high as 270℃ when empty under the sun, so the initial input of water or input water into an empty tank should be carried out 2 hours before sunrise or 2 hours after sunset.

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7. How can I use solar water heater if there is no tap water?

If you want to use solar water heater in areas without tap water, you could usually apply a pump to input water. Besides, you could install an extra water tank which stands the same height as the solar water heater to store cold water so that you cold mix the cold water with the hot water from the solar water heater. (Please be noted: if you want to input water into the solar water heater, then the extra tank should stands higher than the solar water heater.)

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8. How to use solar water heater in area with fixed water-releasing place?

If you want to use solar water heater in area with fixed water-releasing place, you could install a water tank with ball cocks to connect with the input and output openings, the water tank should stands at the same height as the solar water heater. So when there is water, the tank will input water automatically, and you could also use the cold water to mix the hot water.

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9. How to use solar water heater cloudy or rainy days?
Kaidun solar water heater installs auxiliary electric heating system; you could plug in 5 to 10 hours before use in cloudy or rainy days to heat the water in the tank. You should input the amount of water you need so as to save electricity.
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10. What should be noticed when using solar water heater?

A. You should notice the time to input water; B. The amount of water to input depends on the weather conditions, so that the water could be warm enough when you are having a shower; C. Check the pipeline and vent hole periodically; D. In areas with heavy pollution or heavy sand storm or drought areas, please wash the evacuated tubes periodically. E. After installation, only the professionals are allowed to move or disassembly the heater; F. Before using hot water, the power supply of the auxiliary electric heater should be cut off; G. The auxiliary electric heater should be unplugged in stormy days or in long time of not using.

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11. How to tell that the water in the solar water heater is fully filled?

Usually there is a overflowing pipe, if there is water running out of the pipe, the tank is fully filled. Also, you could install a waterline controller, which will alert when the water is full.

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12. How to protect the evacuated tubes?
A. As the evacuated tubes are made of glass, so it is easy to break. Please do not strike or impact them with force, just in case that the tubes be broken; B. The vacuum of the evacuated tubes determines the heat-preserving capability, so please be careful with the sharp tip of the tubes; C. The inner walls of the tubes are plated with selective coating to absorb heat, please do not brush heavily. To get rid of the furring, you could put in some acid liquid and water and swag it to dissolve.
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13. What should be noticed when using the electric heater?

A. Do not use the electric heater when there is no water in the tank; B Do please unplug the creepage protection plug when not in use; C. Check the reliability of the creepage protection plug before use; D. When the creepage protection plug is broken, you should not use a common plug to change it.

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14. What are the features of the raw material of Kaidun solar water heater?

The principle of Kaidun choosing material is that: if the domestic material is good enough, we choose the best one; if the domestic material is not good enough, we choose the imported one. So the good quality of the product is decided by the good quality of the raw material.

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15. How to tell whether an evacuated tube is good or not?

A. The good evacuated tube should have intact mirror end; B. The coating of the tube should have a nice color and no peeling, no serious scratches .C. The sharp tip should be intact; D. If the upper end breaks evenly, it is a faulty one; E. If there are some tiny scratches on the coating of the inner tube, they are caused by the tip spring getter, it is not a faulty one.

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16. If there is already a gas or electric heater, can I install a solar heater also?

Yes. The solar water heater has a larger hot water output; it can provide hot water for more purposes, such as tubbing, washing hands, washing vegetables, clothes etc. With the help of solar water, the working life of gas or electric heater will be lengthened and their safety will be improved. To install a solar water, an independent pipeline is needed.

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17. How long is the guarantee period of your product?
The main part of our product is guaranteed for 3years, the auxiliaries are guaranteed for 1 year.
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18. What does the main part include? What do the auxiliaries include?
The main part includes the water tank, the bracket, the evacuated tubes. The auxiliaries include the electric heater, sensors, waterline and water temperature controllers, etc.
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19. What if the solar water heater breaks down after the guarantee period?
The main part of our product is guaranteed for 2 years, the auxiliaries are guaranteed for 1 year. Maintenance service is available to all of them throughout the working life. After the guarantee period, we will continue to provide service with certain charge.
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20. Will the maintenance service be charged in the guarantee period?
In the guarantee period, if the solar water heater breaks down due to quality problem, there is no charge for the material, spare parts and service;if the problem was caused by improper use, you will be charged the material cost.
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21. How to use a solar water heater?
It is very easy to use a solar water heater. You will find a detailed instruction in the user’s manual. Our professionals will give you a demonstration.
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22. Is the installation free or not?

Kaidun products are installed free.

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23. What are the usual methods to prevent frostbite on solar water heater?
A. Put on a thicker insulation layer; B. electric band heater; C. built-in heating wires; D. Special pipelines with heat-absorbing surface coating to melt ice; E. Empty the water in the pipelines.
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24. What parts of the solar water heater should be carefully dealt with to prevent frostbite?

 A. The vent holes; B. The elbow or turnings; C. The joints of the pipelines; D. The joints on the wall. In a word, all the pipelines outdoor should be carefully dealt with to prevent frostbite.

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25. What are the components of a Solar Water Heater?
Basically, a solar water heater is combination of solar collector, water tank, bracket and some related spare parts.
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26. What are the advantages of solar water heater?

There are five advantages:
 1. Solar energy is inexhaustible in supply and always available for using;
 2. It is economical. Nowadays, the prices of gas and electricity are getting higher and higher. But we can get solar energy from the sun for free;
 3. It can be co-operated with back-up such as gas or electrical heater to make the heater works all years even in bad weather.
 4. It is a kind of new green energy. No pollution and very safety..
 5. It is longtime life and can be used over 15 years.

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27. How many years do you guarantee your products?
We guarantee the solar water heater for 3 years and the spare parts for 1 year. But their life time normally can be over 15 years in proper operation.
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28. How big the solar water heater I need to buy?
For household use, one person daily needs about 50 liters hot water for shower. For example, there are 3 persons for one family; you need 150 liters solar water heaters. If you also need hot water in kitchen, another 50 liters should be added.
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29. What’s the temperature of the water we can get by using your solar water heaters?
At normal sunny days, with 8 hours of fair sunshine, you can get at least 85℃ of hot water. In summer time, the water can easily boils.
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