The external coil and the internal coil of the water tank of the air energy water heater are not good or bad in an absolute sense, and each has its own advantages and disadvantages:

1. Built-in coil:

Advantages: high efficiency, rapid heating, high energy efficiency ratio, low maintenance cost;

Disadvantages: long-term use, the coil is prone to scale formation in contact with water, which affects thermal efficiency, and is prone to corrosion due to different water quality.

However, the current water tanks with built-in coils for air energy water heaters, like Chigo’s series of water heaters, all have a built-in magnesium rod design, which can effectively prevent the water tank from scaling and corrosion, thus eliminating the shortcomings of the built-in coil. In order to maximize the advantages of the inner coil.

Working principle: Once the weld of the inner tank leaks iron, it will be corroded quickly. Because the activity of magnesium is higher than that of iron, the magnesium is corroded first to protect the iron. Therefore, the anode magnesium rod is not used for scale removal. The protection principle shows that it mainly produces magnesium oxide, and of course it will neutralize other free negative ions, such as magnesium carbonate. None of these things are harmful to the human body. No need to worry about it.

2. External coil:

Advantages: the coil is not in direct contact with water, and it is not easily affected by water quality, scaling and corrosion;

Disadvantages: Compared with the inner coil, the thermal efficiency is low, the heating is slow, and the coil is damaged and can only be replaced. The inner wall of the water tank will also produce scale during use. Due to the repeated influence of thermal expansion and contraction, the coil wall is easy to separate and the inner tank is easy to burst.

Therefore, the inner and outer coils of the air-energy water heater tank have their own strengths and weaknesses. Choose for yourself. However, as a consumer-I use a product from Chigo Air Energy Evian. The inner coil water tank is still good. After using it for so long, there is no problem, and the heating speed is still Yes, it is highly recommended.

For more product information, please click here: Hot Water Coil Manufacturers.