Instant electric water heater Because there is no need to preheat in advance, the heat energy is lost when there is no preheating. When it is opened when it is not used, it is closed. As much water is used, there is no energy consumption of unused residual hot water heated by the water storage water heater, which truly saves energy, electricity and water. Generally speaking, instant heating Electric water heater It can save 15% - 30% electricity compared with the traditional electric water heater. Therefore, the country classifies such products as energy-saving products. In the case of shortage of water and electricity, it is undoubtedly of great practical significance to focus on promoting this product. This is also a key consideration for consumers when choosing instant electric water heaters.

The common power of domestic instantaneous electric water heater is about 3000W, so we will take the 3000W electric water heater as an example to calculate the current of the instantaneous electric water heater;

Since the instantaneous electric water heater is a pure resistance appliance, we can take 1 as the power factor, that is, cos φ＝ 1. In addition, the household transformer is basically 220V single-phase, so the voltage U=220V;

According to the power calculation formula P=UIcos φ， To calculate the current I ＝ P/(Ucos φ）＝ 3000W/（220V×1）＝14A；

So 3000W Instant water heater We can choose a 16A socket, and we suggest you choose C20A leakage protection switch for the circuit switch. Although 2.5 square meters of wire is enough, we are still used to increasing the size by one. We can choose 4 square meters of national standard copper wire.

That is, if the power of the water heater is below 5000W; You can also install the same four pole 25A socket (one of which is discarded) instead of the three pole socket. For safety reasons, the front end of the socket should be installed with a double pole or single pole plus N leakage circuit breaker to control the connection and disconnection of the socket. In household appliances, electric water heaters are extremely dangerous appliances, especially instant electric water heaters. It is recommended that water storage electric water heaters should not be used until they are powered off, and instant electric water heaters should also be used only after the container is filled with hot water and powered off to ensure safety.

When installing the instantaneous electric water heater, it must be equipped with an anti leakage air switch, which is directly connected to the line instead of using a plug and socket. The reason is that Instant water heater brand The power of the instant electric water heater is relatively high, and the plug and socket will age and burn out after being used for a long time.