Lehua brand automatic electric shower

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As shown in the figure, the Lehua brand automatic electric shower circuit. The electric water heaters on the market are divided into two types: water storage type and waterless type. The water storage type electric water heater needs to heat the water in the water tank for a long time, and the hot water shower in the water tank is required after the water temperature reaches the requirement. The waterless box type electric water heater allows the cold water to flow through the electric water heater to reach the required temperature and immediately flows out of the nozzle for the shower. For these two differently designed showers, if a water storage type electric water heater is used, there is no requirement for the magnitude of the heating current (power) (the water in the storage tank can be heated to a longer time when the current is small) A certain temperature), so it can be used without exceeding the current allowed by the home lighting circuit. Obviously, this is ok; but if an instant electric water heater is used, it has a certain amount of heating current (power). If the requirement exceeds the maximum current allowed in the power supply circuit, the water heater will not work in this circuit. Therefore, to choose an electric water heater suitable for your family, you need to consider the three factors of the maximum current allowed by the power supply circuit, the flow of water heater water, and the change of water temperature. From the physical point of view, according to these three factors, there are the following three methods of comparison and judgment.