Electric water heaters have the advantages of long lifespan, high efficiency, energy conservation, safety, and environmental protection. They can also be hidden in wall cabinets and balconies, without being exposed or occupying land. Instant electric water heaters have relatively high power and high circuit requirements: generally, the power is required to be at least 6KW or above, and even 8KW in winter is difficult to ensure sufficient hot water for bathing. The power cord requires at least 2.5 square meters or more, and some require 5 square meters or more.