Disclosed is a thermostatic, electric storage, water heater for a water supply terminal, which mainly consists of a water storage tank (2), a heating pipe (3), a three-way water valve (16), an electrical control three-way water valve (11), a thermostatic water valve (9) for mixing hot and cold water, and a controller (13), wherein a horizontal end of the three-way water valve (16) is connected to a water inlet pipe of a hot water source, and a lower end thereof is connected to a second water inlet (17) of the electrical control three-way water valve (11). A fifth water inlet (4) on a lower end of the electrical control three-way water valve (11) is connected to a tap-water pipe, and a horizontal end thereof is connected to a third water inlet (12) of the thermostatic water valve (9) for mixing hot and cold water. Temperature signals and water flow signals from the heating pipe (3), the three-way water valve (16) and a water flow sensor (14) provided inside the thermostatic water valve (9) for mixing hot and cold water are transmitted to the controller (13). The electric water heater can quickly obtain continuous and stable constant-temperature hot water.