Instant electric water heaters have many advantages, such as being able to start and heat immediately, saving time and electricity, energy conservation and environmental protection, compact size, and constant water temperature. The core technology of high-quality instant electric water heaters is crucial, as it determines the performance and safety of the water heater.

Electric water heater refers to a water heater that uses electricity as its energy source for heating. It is one of the three major water heaters in parallel with gas water heaters and solar water heaters. Electric water heaters can be divided into three types according to their heating power: storage type (also known as volumetric or thermal storage type), immediate heating type, and rapid heating type (also known as semi storage type).