How to choose an air source water heater1. Compressor
As the core driver of an air source water heater, when choosing an air source water heater, you must pay attention to the compressor brand it uses. The domestic market uses world-class compressors such as Panasonic, Toshiba, Mitsubishi, etc., while the best ones in the commercial market are Copeland, Japan, and Panasonic compressors. In addition to the brand, it also depends on its heating capacity, rated power and the corresponding water tank capacity ratio.
2. Insulation layer
If an air source water heater does not have a good insulation function, it is not a real air source water heater. The air source water heater is a heat storage water heater with a large water output. The water temperature is generally set at 45℃-55℃. Most air source water heaters have the function of maintaining temperature. For example, if the water temperature is set to 45℃-55℃, the temperature is higher than 55℃, it will automatically stop and stop heating. If the water temperature is lower than 45℃, it will automatically start heating to make the water tank temperature. Keep it above 55°C. Water heaters with poor water tank insulation will often start heating due to large heat loss. High-quality air source water heaters will have relatively thick thermal insulation, imported polyurethane materials, and mature foaming processes to reduce the temperature of the hot water in the water tank, which saves energy and saves a lot of electricity invisibly. (The temperature setting data is for reference only)
The inner tank is the most critical component of the water tank. At present, the inner tanks on the market mainly include stainless steel inner tanks, enamel inner tanks, and special steel inner tanks.
Special steel liner: It is composed of pressure-bearing layer and leak-proof layer, with separate design. The pressure-bearing layer is made of cold-rolled steel sheet. The leak-proof layer is made of crystal coating (special synthetic polymer material). After high-temperature treatment and steel-crystal integration process, the entire inner tank surface and opening are integrated into one piece, without any solder joints or welding. Seam, super anti-corrosion, prevent water leakage.
Stainless steel inner tank: welded by stainless steel. Literally understood that it will never rust, but after the metal sheet is subjected to high temperature and high pressure (1, the nickel element is reduced and destroyed, 304 stainless steel contains 7.5-8 nickel, and its main function is to resist acid and corrosion. 2. The chromium content is reduced, and 304 stainless steel It will not rust if it contains more than 13% chromium, and after high-temperature welding, it will be significantly reduced to below 11%).
Enamel liner: As a non-metallic material, in the case of smooth metal without rhomboid, enamel, after climax sintering, enamel into the surface of the liner. Due to the limited thickness of enamel, too thick enamel seriously affects adhesion and uniformity, easy to leak, and the surface is not smooth and easy to scale.
In summary, stainless steel liner is the best choice.
First of all, look at whether the coil is good or not. The best coil currently on the market is the oxygen-free copper pipe produced by Hailiang Group. Secondly, it is the outer coil or the inner coil. The inner coil is better than the outer coil, because the copper pipe is placed in the water tank and directly contacts the water, the heating efficiency is higher, the heating time is greatly saved, and the power is saved. The copper pipe is coiled outside the water tank, and the copper pipe needs to heat the water tank first. The heat preservation layer, reheating the water, reduces the heating efficiency and consumes electricity, which violates our purpose of buying air source to save energy and electricity. There is a fatal problem with the copper pipe coil outside the water tank. The copper pipe must first heat the heat preservation layer. The insulation layer will re-foam when exposed to high temperature and high pressure for a long time, and the inner bladder will burst easily. In addition, the cost of the inner coil is lower than that of the outer coil in terms of maintenance cost.
5. Water tank capacity selection
The capacity selection mainly considers factors such as household population and hot water consumption. Generally choose 50-60 liters of water per person, for example, there are 5 people in the family. We can choose a 250L or 300L incubator. Since we consider that guests will come to live during the New Year or the winter will use some hot water to wash vegetables, etc., it is better to choose a larger capacity water tank according to the actual situation.
6. Installation location
At present, there are two types of air source water heaters: round water tank and square water tank. For those with ample outdoor space, you can choose a round water tank. If there is not much outdoor space, you can choose a square water tank (more beautiful), place the host outside and the water tank indoors. The main engine is installed in a ventilated and warm environment with better energy-saving effect. When buying an air source water heater, consider whether the installation is convenient or not. Some are All in One Heat Pump Water Heaters that install the water tank and the host in the same metal box. Relatively speaking, this kind of air source water heater is easy to install, and the manufacturer's production cost is higher. Of course, the price is also much more expensive. Special attention should be paid here. The outer shell of all in one water heater must be stainless steel.
7. Brand service
Consumers must understand the product's quality and after-sales service before purchasing the machine. At present, the air source water heaters on the market are guaranteed for three years.
8. When purchasing, you also need to consider the following precautions:
1) Appearance inspection: The outer surface of the paint should be uniform, bright in color, without falling off, no dents, or severe scratches, squeezing marks, etc.; the outer shell should be fluorine titanium plate. It is recommended to use stainless steel instead of color plates!
2) Strictly prevent counterfeit and inferior products, it is best to buy directly from the manufacturer.
3) The accessories must be complete.
4) Inspection of the power plug: the wiring must be firm, and of course it is better if the wire is thick and hard. If it is too small, it will heat up after being powered on for a while, and even if it is turned on for a long time, it will cause a fire due to overheating.
5) Power-on test, constant temperature performance check whether the indicator light is on, whether the machine is humanized setting does not need to be normally open and normally closed. Whether there is overheating protection function and whether the defrosting is good.
6) Noise: The smaller the noise of the heat pump water heater, the better.
7) If the water heater has magnetization or ion activation function, the effect will be better.