Abstract: The present invention discloses an easy-to-adjust water heater, which comprises a body provided with a heating device, and a wired control box connected with the body through wire for controlling the working state of the heating device; the wired control box is provided with a temperature increasing button, a temperature decreasing button and a water heater switch button on the surface thereof. The wired control box of the water heater according to the present invention is configured outside the body of the water heater via a wire connection, and used to control the working state of the heating device within the water heater. In use, the wired control box may be disposed within the bathroom, while the water heater may be disposed in a drier place outside the bathroom, the advantage of the present invention lies in allowing the user to adjust the water temperature conveniently during shower with the water heater, at the same time avoiding the use of the water heater in a wet environment.