Instant electric water heaters generally require a current of 20 or even 30 amperes or more, which is instant heating with constant water temperature, high heating efficiency, and small installation space. Internal low-pressure treatment can add a splitter during installation. Products with higher power can be installed in the bathroom, which can be used for both showering and washing. Generally, household use is energy-saving and environmentally friendly.

Although the volume of an ordinary fast heating electric water heater is similar to that of a dual mode electric water heater, the internal structure is vastly different. Compared to a water storage electric water heater, a fast heating electric water heater is only smaller in size and has higher power, so it is indeed faster in heating speed than a water storage electric water heater. However, it cannot achieve instant heating in spring and autumn and needs to be preheated, which requires waiting. However, a dual mode electric water heater can only achieve instant heating in spring and summer The instant heating mode is available for the three seasons of autumn, which is instant heating.