The following information is very useful and can definitely add a lot of good suggestions to your choice! ! !
At present, there are at least 30 brands of solar water heaters on the market, except those produced by a few well-known domestic enterprises, such as Beijing, Tsinghua, Sunshine, etc., and there are also many inferior assembled products and fake and inferior products produced by small factories. Therefore, people must pay attention to shop around when choosing solar water heaters.
When you choose, you must look at whether it is produced by a regular manufacturer or assembled. It is understood that there are at least 10 brands of water heaters on the market at present, and their quality and after-sales service are definitely not guaranteed.
It depends on whether the vacuum tube of the water heater has anti-counterfeiting marks, and some shoddy vacuum tubes can be exposed.
It depends on whether the liner is a food-grade stainless steel liner. Many salespeople of water heaters keep saying that their water heater liners are stainless steel, but in fact, they are chrome-plated liners, which have a certain impact on their service life and water quality, and consumers can't help it. The common identification method is magnetic adsorption, but this method is invalid for austenitic stainless steel, because stainless steel is nonmagnetic.
The texture of the insulation layer must be careful. After pulling off the vacuum tube, the polyurethane in the insulation layer can be foamed by hand. If it feels soft, it is foam, which has a short service life and is easy to leak. If it feels hard, it is polyurethane, which has excellent heat insulation performance.
It depends on whether the stainless steel bracket is "genuine". Some water heaters are said to be ultra-thin stainless steel brackets, but in fact, the texture is very poor, even the firmness of galvanized brackets is not as good. Therefore, we must be careful when choosing. At the same time, it should be pointed out that under normal circumstances, the per capita water consumption is about 30-40 liters, and consumers can choose water heaters with corresponding capacity according to the population at home.
With the enhancement of people's awareness of environmental protection and energy saving, more and more families have installed solar water heaters. In order to ensure normal use, consumers should pay attention to the following issues when purchasing solar water heaters:
1. What's the use of buying a solar water heater?
(1) Do you need hot water to wash dishes?
(2) Do you want to wash your hands and clothes with hot water?
(3) Do you want to wash the rag and mop the floor with hot water?
(4) Have you considered washing your car with hot water?
2. Have you ever considered bathing the elderly at home?
Old people tend to get tired and slip after taking a long bath. When taking a bath, the heat is low and the temperature is low, and the elderly are prone to catch a cold; Shower is not as refreshing and comfortable as bath. Therefore, in order to be safe and healthy, it is better to let the elderly at home take more bath.
3. How many faucets are there in the house? Does every faucet need hot water?
Solar water heater can realize multi-channel water supply, so that each faucet has hot water available, making it more convenient for family members to use hot water.
4. Do you want to use hot water in winter?
For the sake of health, more and more people choose to take a bath at home. When taking a bath, put some hot water first, and the water temperature in the bathroom will rise, so they can take a bath at home. Even if you don't take a bath at home in winter, you should wash your hands, dishes, vegetables and clothes at home.
5. Do you want to use hot water when the sun is bad?
When the sun is bad, if the solar water heater gets a lot of heat, you don't have to worry about storing hot water in the water tank of the solar water heater, and hot water can also be used.
6. Do you want to spend the night with hot water?
If the solar water heater has a high insulation effect, the water can be kept at a high temperature overnight, which will not affect the use of the next day.
7. Do you want to buy one in one step or change it in a few years? Can you buy it for three or five years or for more than ten years?
According to the survey, in the next three years, the per capita consumption of domestic hot water in China will keep pace with the developed countries in Europe and America. A good solar water heater can meet the demand for hot water in one step, ensuring that it will not fall behind in three to five years.
A good solar water heater can reach a bathing temperature of more than 42 degrees a day when the weather is good in winter, and some can't;
Life span varies greatly. Some solar water heaters can be used for 3 years, 5 years and 8 years, and good solar water heaters can be used for more than 10 years, so the total amount of hot water produced is 4 or 5 times different.
8. Do you want to buy 35-degree hot water or 80-degree hot water when the sun is bad?
If the solar energy gets high heat, it can provide enough hot water when the sun is not good.
There are many kinds of domestic solar water heaters, which can be divided into vacuum tube type and flat plate type according to the types of solar collectors. According to the structure, it can be divided into integral type and split type; According to the manufacturing process, it can be divided into pressure-bearing type and non-pressure-bearing type At present, the most common domestic solar water heaters sold in the market are mostly non-pressure vacuum tube domestic solar water heaters. General:
Look at the vacuum tube: vacuum tube is the most important part of solar water heater. At present, it can be divided into thick tubes (generally 58mm in diameter) and thin tubes (generally 47mm in diameter). Relatively speaking, the thick tube has large heat collection area, fast heat collection and high water temperature, so the thick tube solar water heater should be the first choice when purchasing.
There are mainly two kinds of materials for manufacturing vacuum tubes: single target machine and triple target machine, among which the quality of triple target machine is better, and consumers can identify it by appearance when purchasing. The color of the vacuum tube of the single drone is gray with color difference, and the inner wall of the vacuum tube is light black; However, the appearance of the vacuum tubes of the three target aircraft is blue, with no color difference, and the inner walls are dark red.
Second, balance the weight: the water tank is very important for the water heater. Generally, the quality of heavy water tanks is good. The weight is mainly determined by the material of the water tank shell and the foam layer between the water tank shell and the water tank liner.
Generally, the shell of poor water tanks is made of shiny stainless steel (many big cities have banned the use of water heaters made of this material because of light pollution), and the shell is not thick enough and light in weight.
Foam layer is directly related to the heat preservation effect of water heater, so it is also very important for the use of water heater. The foaming layer of famous brand products is generally foamed by high-pressure machine, so that there is no air between the shell and the inner container, and the foaming layer is dense and thick. So the whole water tank is often heavy.
Three evaluation brackets: aluminum alloy brackets are generally used for solar water heaters with good quality, which are thick and firm.
● Note: The quality of the water heater liner cannot be identified by its appearance, but consumers can judge it by reading the instructions. Generally, the water heaters produced by regular manufacturers are not vague about the material technology of the inner container. Therefore, consumers should read the instructions carefully when purchasing.
How to choose domestic solar water heater
At present, there are many kinds of domestic solar water heaters on the market, which can be divided into vacuum tube type and flat plate type according to the types of solar collectors. According to the structure, it can be divided into integral type and split type; According to the manufacturing process, it can be divided into pressure-bearing type and non-pressure-bearing type. At present, the most common domestic solar water heaters sold in the market are mostly non-pressure vacuum tube domestic solar water heaters. Pay attention to the following points when purchasing household solar water heaters:
1. The higher the daily average efficiency, the better, and the lower the average heat loss coefficient, the better.
2. The key component of domestic solar water heater is all-glass vacuum solar collector tube (vacuum tube for short), and the quality of vacuum tube directly affects the performance of the whole domestic solar water heater. When buying, carefully observe the coating on the glass tube inside the vacuum tube. This kind of coating is called solar selective absorption coating. Due to the different manufacturing processes of various manufacturers, the coating color will be different, but it is generally black, dark blue or dark gray. The coating with good quality has uniform color, no scratches, peeling and falling off, and no stones and nodules on the glass. The bracket supporting the inner glass tube is placed correctly without looseness.
3. Pay attention to the tube spacing between vacuum tubes when purchasing. Generally, the center distance between two tubes is about 70 mm. ..
4. The bracket design of domestic solar water heater should be reasonable, with sufficient strength and rigidity to ensure sufficient bearing capacity. In some areas where the daily wind is strong, especially in coastal areas, when purchasing domestic solar water heaters, we should also pay attention to whether the products have wind resistance in design.
5. At present, there are various forms of reflectors for household solar water heaters on the market, including plane reflectors, curved reflectors and embossed aluminum plates. Pay attention to whether the reflector design of the product can make full use of the heat absorption surface of the vacuum tube and whether the vacuum tube can receive light to the maximum extent.
6. When purchasing, we should also consider the number of permanent residents in the home to determine the water-making capacity of the purchased household solar water heater. Generally, the standard of 40 liters of water per person is appropriate. In addition, the nominal water capacity of many products is calculated by calculating the capacity of each vacuum tube and the capacity of the water tank liner, but in fact, the water below the outlet of the water heater and in the vacuum tube cannot be discharged for use, and the water that users can really use is only the water between the inlet and the overflow, so when buying, ask the seller clearly whether their nominal water capacity refers to the total water capacity or the actual water capacity, and how much is the difference.
7. If enough domestic solar water heaters need to be equipped with electric heating devices, products with electrical safety design should be selected.
8. When purchasing other related accessories, such as automatic water supply device, water temperature and water level indicator, solenoid valve, etc. The choice of these devices should be cautious. Some functions seem advanced, but there are too many components, and the reliability is not high, which is easy to cause problems over time. Be sure to ask about the service life and warranty period when choosing.
9. After purchasing a household solar water heater, pay attention to whether the bracket is firmly installed, whether all screws and joints are tightened, whether the installation position of the upper and lower water pipes is reasonable, and whether the water heater itself has reinforcement measures. In addition, a check device must be installed in the water supply pipeline to prevent hot water from flowing backwards and pouring into the cold water pipeline.
10. The after-sales service of domestic solar water heaters is also very important. It is best to choose well-known brand products and dealers with good after-sales service. Because domestic solar water heaters are durable consumer goods, they are generally installed on the roof. Once problems occur, it is difficult for users to solve them themselves, so after-sales service must be guaranteed. At present, the free warranty period of the whole machine on the market generally ranges from 3 to 5 years.
1 1. Because the domestic solar water heater is installed outdoors, the vacuum tube will be polluted by dust or impurities for a long time, resulting in a decrease in heat absorption efficiency. Therefore, the vacuum tube of water heater should be cleaned regularly, especially in snowy areas in winter, and it needs to be cleaned in time after snow. If you can't clean yourself due to the influence of house design, you should ask the dealer whether regular cleaning is included in the after-sales service.