Currently, most of the most common household solar water heaters sold on the market are non-pressure vacuum tube household solar water heaters, such as Huangming Siji Muge and Sangle Taiyangyu.
They are all good. When purchasing a domestic solar water heater, 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 best.
2. The key part of domestic solar water heaters is the vacuum tube. When purchasing, you should carefully observe the coating on the glass tube at the interior of the vacuum tube This coating is called selective solar absorption coating is usually black, dark blue or dark gray, good quality coating is uniform in color, the film layer does not have scratches, peeling or peeling. coat, and heThere are no stones or nodules on the glass.
3. When purchasing, you should also pay attention to the tube spacing between the vacuum tubes. Generally, the center distance between the two tubes is approximately 70 mm.
4. The bracket of a domestic solar water heater must have sufficient strength and rigidity (plus corrosion resistance, do not let the bracket fall after two years) to ensure sufficient load capacity. In some areas with strong daily winds, especially coastal areas such as Beibu Gulf, you should also pay attention to the wind resistance of the product.
5. When purchasing, you should also consider the number of permanent residents in the house to determine the water capacity of the home solar water heater you are purchasing. Generally, the standard of 40 liters of water per person is appropriate. When purchasing, you must clearly ask the seller if hisRated water capacity refers to the total water capacity or the actually usable water capacity, and what is the difference between the two.
6. If the home solar water heater you are purchasing is to be equipped with an electric heater, you should choose a product with an electrical safety design.
7. 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. Reliability is not high and problems are likely to arise over time. When choosing, be sure to ask about the service life and warranty period.
8. The after-sales service of domestic solar water heaters is also very important. It is best to choosea reseller offering well-known brand products and good after-sales service. Since domestic solar water heaters are consumer durable goods and are usually installed on the roof of a building, once a fault occurs, it is difficult for users to resolve it themselves, the service after-sales must therefore be guaranteed. Currently, the free warranty period for complete machines on the market generally extends from 3 to 5 years.
9. Since household solar water heaters are installed outdoors, after long-term use, the vacuum tubes will be contaminated with dust or impurities, resulting in a reduction in heat absorption efficiency . Therefore, the water heater vacuum tube should be cleaned regularly, especially in snowy areas in winter. It must be cleaned in time after snow. If you can't clean it yourselfDue to the design of the house, you should ask the dealer if regular cleaning is included in the after-sales service.
Simple judgment method for choosing a home solar water heater
1 Look at the appearance (fineness of workmanship: water tank, bracket, screw.Wire, material processing insulator)
2. Look at the firmness of the support (thickness of the support), corrosion resistance (material), stability (rationality of the structure) and also weigh the weight
3. The thickness of the inner tank of the water tank (weigh the weight of the water tank, it is a little heavy for most people) or you can see the inner tank by removing the silicone ring and touching the mouth rolled inside.
4. Whether there is no color difference in the color of the vacuum tube (one tube, all), the qualified color should be consistent. You can also simply compare the weight of each tubesolar vacuum to focus on the right points.
5. Price reference: 100-120 yuan/piece for diameter 58 pipes*1.8 meters (including installation materials: upper and lower pipes (normal residential buildings of 6-7 floors, generally regardless of length pipe), insulation materials, overflow pipes, upper and lower joints, indoor water supply system, a main valve, etc. are all installed for you at no extra cost. are not included: electric heater (100-150), microcomputer (100-300), heating tape, etc. If you buy it, it will be a complete set of configurations (no extra money). Everything is also installed at no extra cost. host (different manufacturers have different free warranty periods), all accessories have at least one year free warranty. They offerus lifetime service (fee will be charged after warranty period). They can be repaired by anyone and, in principle, all accessories are universal.
6. Capacity: Calculate the water tank based on 20-40kg per person, remove about 5cm of insulation material (look at the position of the water outlet on the side part, from its lower end to the bottom of the water tank corresponds to the thickness of the insulating layer.) The volume of the inner tank is the cylindrical volume, which basically corresponds to the amount of water available to the user.
Nanning Wanchuan City Hardware Store, Youtai Hardware Store.
1. Nanning Wanchuan Hardware: The address is located at No. 52 Xiuling Road, Xixiangtang District, Nanning City, Guangxi Zhuang Autonomous Region. 5:00 p.m. Sells hardware equipment and solar vacuum tubes.
2. Youtai hardware store: the address is sikilled in Dancun Commercial Town, Jiangnan District, Nanning City, Guangxi Zhuang Autonomous Region. Opening hours are Monday to Sunday from 8:00 a.m. to 5:00 p.m. p.m. It sells computer hardware and solar vacuum tubes.