Water inlet device and water heater

The invention discloses a water inlet device and a water heater, and the water inlet device comprises a valve body which is provided with a first water passing port, a second water passing port and a bypass water outlet; the valve assembly comprises a valve rod, a valve sleeve and an intercepting plate, the valve sleeve and the intercepting plate are sequentially and fixedly arranged on the valve rod, and the intercepting plate is arranged close to one end of the valve rod; wherein the valve rod is rotatably arranged on the valve body and can move relative to the valve body in the rotating process, the valve sleeve and the intercepting plate are located in the valve body, and the valve sleeve is arranged on one side of the bypass water outlet and used for adjusting the opening degree of the bypass water outlet. The intercepting plate is arranged opposite to the second water passing opening and used for adjusting the opening degree of the second water passing opening. The problems that in the prior art, a wate