How to distinguish whether the air source heat pump water heater is a water circulation mode or fluorine circulation mode

1. Judging from the volume of the main engine. 
Water-circulating air-energy water heater is larger than fluorine cycle in appearance due to the addition of many equipment components, so it occupies a relatively large position in installation.          

 2. Judging from the connection material.           
The main engine and water tank are connected by copper pipes for fluorine circulation and water pipes for water circulation.           

3. Judging from the viscera of the host.           
Open the main body cover, the main body of the water cycle has not only the equipment components that the general water heater should have, but also the casing heat exchanger, expansion tank, water pump, etc. The structure is more complex; while the equipment components of the main body of the fluorine cycle are relatively simple, so the cost will correspondingly be lower.      
    
4. Judge from the water tank.           
Fluorine circulating unit adopts coil heat exchanger. This kind of heat exchanger can be divided into two kinds: one is that the built-in coil directly contacts with water, the other is that the inner and outer coils. The built-in coil directly contacts with water. After a period of use, it is easy to produce scale on its surface, and its energy efficiency will be greatly reduced. Although the heat transfer effect of the external coil is slightly lower than that of the built-in coil, it will not cause the above problems, with high energy efficiency and long service life. For example, Finney air water heater uses outer coil, and its normal service life can reach 10-15 years. Water circulating water tank is a simple pressurized heat preservation water tank, heat exchanger in the main engine. Heat exchangers generally adopt shell-and-tube type. Good heat transfer effect and long service life.