Tsinghua Sunshine, Huangming, Linorite, and Yijia Neng are all good.

The following information is very useful and can definitely add a lot of good suggestions to your choice! ! !

Currently, there are at least 30 brands of solar water heaters on the market. Except for a few solar water heaters produced by well-known domestic companies such as Beijing Tsinghua Sunshine, there are also some unreliable assembled products and shoddy products manufactured by small factories. product. Therefore, when choosing a solar water heater, people must pay attention to shopping around.

When selecting, be sure to check whether it is produced by a regular manufacturer or assembled. It is understood that there are at least 10 brands of water heaters currently on the market that are assembled goods, and of course their quality and after-sales service cannot be guaranteed.

It depends on whether the vacuum tube of the water heater has an anti-counterfeiting mark, which can reveal the true nature of some substandard vacuum tubes.

It depends on whether the inner tank is made of food-grade stainless steel. There are many water heater sales staff who keep saying that the inner tank of their water heaters is stainless steel, but in fact it is a chrome-plated inner tank. This has a certain impact on its service life and water quality. Consumers must be careful. The common identification method is to use magnets to attract them. But for austenitic stainless steel, this method does not work because this stainless steel is non-magnetic.

Be careful with the texture of the insulation layer. After unplugging the vacuum tube, you can use your hands to press the polyurethane in the insulation layer to foam it. If it feels soft when you press it, it is foam. Its service life is short and it is easy to leak. If it feels hard, it is polyurethane, which has excellent thermal insulation properties.

It depends on whether the stainless steel bracket is "genuine". Some water heaters claim to have ultra-thin stainless steel brackets, but in fact the quality is very poor, not even as strong as galvanized brackets. So be careful when choosing. At the same time, it should be pointed out that under normal circumstances, the water consumption per person per time is about 30-40 liters. Consumers can choose a water heater with corresponding capacity according to the number of people in their home.

As people’s awareness of environmental protection and energy conservation increases, more and more households are installing solar water heaters. To ensure normal use, consumers should pay attention to the following issues when purchasing solar water heaters:

1. What is the purpose of buying a solar water heater?

(1) Do you want to use hot water for washing dishes and vegetables?

(2) Do you want to use hot water to wash your hands and clothes?

(3) Do you want to use hot water to wash the rag and mop the floor (wash the mop)?

(4) Have you ever considered washing your car with hot water?

2. Have you considered taking a bath for the elderly at home?

The elderly are prone to fatigue and slipping if they take a shower for a long time; there is little heat and low temperature during the shower, and the elderly are prone to colds; showering is not as relaxing and comfortable as a bath. Therefore, for safety and health reasons, it is better for the elderly at home to take baths more often.

3. How many faucets are there in your home? Does every faucet want hot water?

Solar water heaters can realize multi-channel water supply, so that every 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?

Based on health considerations, more and more people are choosing to take a bath at home. When taking a bath, put some hot water first, the temperature of the bathroom water will rise, and you can take a bath at home. Even if you don’t take a shower at home in winter, you still have to wash your hands, dishes, vegetables, clothes, etc. at home.

5. Do you want to use hot water when the sun is not good?

When the sun is not good, if the solar water heater has a large heat gain and there is hot water stored in the solar water heater's water tank, you don't have to worry about it. You can still use hot water.

6. Do you want to use hot water overnight?

If the solar water heater has a high insulation effect, the water overnight can also maintain a higher temperature without affecting the use the next day.

7. Do you want to buy one that can be installed in one go, or do you want to replace it after a few years? Do you want to buy one that can last three to five years, or one that can last more than ten years?

According to surveys, in the next three years, my country's per capita domestic hot water consumption will keep pace with that of developed countries in Europe and the United States. 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 in one day on sunny days in winter, but some cannot;

The lifespan of some solar water heaters also varies greatly. Water heaters can be used for 3, 5, or 8 years, while good solar water heaters can be used for more than ten years, so the total amount of hot water produced is 4 or 5 times different.

8. Should I buy one that can produce hot water at 35 degrees Celsius or 80 degrees Celsius when the sun is not bright?

If solar energy has higher heat gain, it can provide hot enough water even when the sun is not bright.

There are many types of household solar water heaters. According to the type of solar collector, it can be divided into vacuum tube type and flat type; according to the structure, it can be divided into integrated type and split type; according to the production process, it can be divided into pressure-bearing type and non-supporting type. Pressure type. At present, most of the most common household solar water heaters sold on the market are non-pressure vacuum tube household solar water heaters. General:

A look at the vacuum tube: The vacuum tube is the most important component of the solar water heater. Currently, there are thick tubes (generally 58mm in diameter) and thin tubes (generally 47mm in diameter). Relatively speaking, thick tubes have a large heat collection area, fast heat collection, and high water temperature. Therefore, when purchasing, priority should be given to solar water heaters using thick tubes.

The materials for manufacturing vacuum tubes mainly include single-target machines and three-target machines. The three-target machines have better quality, and consumers can identify them by their appearance when purchasing. The vacuum tube of the single-target machine is gray in color, with color difference, and the inner wall of the vacuum tube is light black; while the vacuum tube of the three-target machine has a bluish appearance, no color difference, and the inner wall is dark red.

Second weight: The water tank is very important for the water heater. Generally, water tanks with heavy weight are of good quality. 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 a relatively poor water tank is made of shiny stainless steel (currently many big cities have banned the use of water heaters made of this material due to the presence of light pollution), and the shell is Not thick enough and light in weight.

The foam layer is directly related to the insulation effect of the water heater, so it is also very critical for the use of the water heater. Generally, the foam layer of famous brand products is foamed by machine at high pressure, so that there is no air between the outer shell and the inner tank, and the foam layer is dense and thick. Therefore, the entire water tank is often heavy to weigh.

Three comments on the bracket: Generally, the brackets of better-quality solar water heaters are made of aluminum alloy brackets, which are thick and strong.

●Note: The quality of the liner of the water heater cannot be identified by appearance. In this case, consumers can judge by reading the instructions. Generally, water heaters produced by regular manufacturers will not be vague about the material technology of the inner tank. Therefore, consumers should read the instructions carefully when purchasing.

How to choose a household solar water heater

Currently, there are many types of household solar water heaters on the market, which can be divided into vacuum tube type and flat plate type according to the type of solar collector. According to the structure, it can be divided into integrated and split types; according to the manufacturing process, it can be divided into pressure-bearing type and non-pressure-bearing type. Currently, most of the most common household solar water heaters sold on the market are non-pressure vacuum tube household solar water heaters. When purchasing a household solar water heater, we should pay attention to the following points:

1. Among thermal performance indicators, the higher the "average daily efficiency", the better, and the lower the "average heat loss coefficient", the better.

2. The key component of a household solar water heater is the all-glass vacuum solar collector tube (vacuum tube for short). The quality of the vacuum tube directly affects the performance of the entire household solar water heater.

When purchasing, you should carefully observe the coating on the glass tube inside the vacuum tube. This coating is called solar selective absorption coating. Due to the different production processes of each manufacturer, the color of the coating will vary, but it is generally black or dark blue. Or dark gray, the coating of good quality is uniform in color, the film has no scratches, peeling or peeling, there are no stones or knots on the glass, and the supports supporting the inner glass tube are placed correctly and not loose.

3. When purchasing, you should also pay attention to the tube spacing between vacuum tubes. Generally, the center distance between the two tubes is about 70mm.

4. The bracket design of household solar water heaters should be reasonable and should have sufficient strength and rigidity to ensure sufficient load-bearing capacity. In some areas with strong daily winds, especially coastal areas, when purchasing a household solar water heater, you should also pay attention to whether the product is designed to withstand wind.

5. Currently on the market, there are various forms of reflectors for household solar water heaters, including flat reflectors, curved reflectors, embossed aluminum plates, etc. When purchasing, you should pay attention to the reflector design of the product. Whether the heat-absorbing surface of the vacuum tube can be fully utilized, and whether the vacuum tube can receive light to the greatest extent.

6. When purchasing, you should also consider the number of permanent residents in the home to determine the water capacity of the household solar water heater you purchase. Generally, the standard of 40 liters of water per person is appropriate. In addition, the nominal water capacity of many products is calculated by adding the capacity of each vacuum tube and the capacity of the water tank. However, in fact, the water below the water heater outlet and in the vacuum tube cannot be released for use. What can the user really do? The water used is only the amount of water between the water inlet and the overflow, so when purchasing, you should ask the seller clearly whether their nominal water capacity refers to the entire water capacity or the actual usable water capacity. How much difference there is between the two.

7. If the home solar water heater you buy needs to be equipped with an electric heating device, you should choose a product with electrical safety design.

8. When purchasing other related accessories, such as automatic water supply devices, water temperature and level indicators, solenoid valves, etc., you should be careful when choosing these devices. Some functions may seem advanced, but they have too many components. The reliability is not high and problems are likely to occur over time. When choosing, be sure to ask about the service life and warranty period.

9. After purchasing a household solar water heater, during the installation process, you should 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 is reinforced. measures, etc. In addition, a check device must be installed in the water supply pipeline to prevent hot water from flowing back and pouring into the cold water pipe.

10. After-sales service for household solar water heaters is also very important. It is best to choose a dealer with well-known brand products and good after-sales service. Because household solar water heaters are durable consumer goods and are usually installed on the roof of a building, once a fault occurs, it is difficult for users to solve it themselves, so after-sales service must be guaranteed. Currently, the free warranty period for complete machines on the market generally ranges from 3 to 5 years.

11. Since household solar water heaters are installed outdoors, if used for a long time, the vacuum tubes will be contaminated by dust or impurities, resulting in a reduction in heat absorption efficiency. Therefore, the vacuum tube of the water heater should be cleaned regularly, especially in snowy areas in winter. It needs to be cleaned in time after snow. If you are unable to clean it yourself due to the design of the house, you should ask the dealer whether regular cleaning is included in the after-sales service.