I. Working principle of instant electric water heater
In principle, that is, the water heater is actually the same as the ordinary storage water heater, and both heat water through electric heating devices. The difference between the two is that the water heater has high power, very fast heating speed, can be used while heating, and has the advantages of no need of water storage tank, constant water temperature, high heating efficiency and small installation space.
Due to the cancellation of the water storage tank, the volume of the whole water heater is naturally much smaller, so the volume of the instant water heater is generally much smaller than that of the storage water heater, and even some instant water heater products are only the size of a stack of A4 papers, which is very space-saving and convenient to install, and does not need expansion screws with strong bearing capacity.
But even such a high-power instant water heater is still difficult to heat the water temperature above 60 degrees like a storage water heater, and the water flow speed cannot be too large, which is a disadvantage of the instant water heater.
Second, the installation conditions of instant electric water heaters are strict.
That is, the heating speed of the water heater is very fast, which naturally requires a lot of electricity. Generally, when taking a bath, the water temperature is 38℃ to 42℃, taking 40℃; The flow rate is 4 ~ 5l/min and 4L/min；; Be occupied; According to the tap water temperature of 20℃ and the heating efficiency of 90%, the required electric power is: (40℃-20℃) * 4,200 J/(kg℃) * 4 kg/60s/90% = 6.2 kW.
Because to achieve a comfortable bath temperature and water temperature, that is, the electric power required by the water heater is much greater than that of the ordinary storage water heater, in the case of domestic 220V power supply, the corresponding current of 6.2kW is: 6.2 kW/220 V = 28.3 A, and this current needs at least 4 square millimeters of copper core wire, which needs to be wired separately, and the selected air switch should be at least 40A to ensure the normal use of the instant water heater.
Extended data:
The specific advantage of that instant electric water heat include:
1. The instant water heater is small in size and capacity, slightly larger than the instant water heater and nearly half smaller than the ordinary storage water heater.
2. The power is slightly higher than that of the ordinary storage water heater, so it is not necessary to run the line separately, and it can be installed by the ordinary household 2.5 square millimeter line.
3. Its heating speed is much faster than that of ordinary electric water heater, and it can be preheated for about 5 minutes in spring and autumn.
In terms of safety, it is equipped with the safety upgrade technology of the anti-electricity wall, which not only solves the leakage problem of the product itself, but also cooperates with the patent safety early warning to avoid the safety hidden danger brought by the electrification of the external environment.
In addition, the water heater will adjust the corresponding bathing temperature according to the season, inlet temperature, outlet flow and water temperature commonly used by users, so as to avoid the embarrassment of remaining or insufficient hot water. It not only solves the problems of long preheating time and large space occupied by water storage type, but also is not limited by high power supply capacity like instant electric water heaters. The electricity-proof wall eliminates potential safety hazards and is a better choice.