Electric water heater

The utility model relates to an electric water heater, which comprises a sealed type water tank which is arranged in an electric heater, a water inlet pipe, a water outlet pipe, a cold and hot water regulating valve, a balance valve which is connected with the water outlet pipe, and a multipurpose one-way valve which is connected with the water inlet pipe. The water tank is connected with the water inlet pipe, the water outlet pipe, and the cold and hot water regulating valve. The A port of the balance valve is connected with the water outlet pipe. The B port of the balance valve is connected with the water outlet pipe in the water tank. The C port of the balance valve is connected with atmosphere. The port of the water outlet pipe is arranged on the top of the inner part of the water tank. A water magnetizing device is arranged in the multipurpose one-way valve. The water tank is also connected with a blowoff valve. A joint of the blowoff valve is connected with a magnesium rod. Because the water outlet pipe is connected with the balance valve and the water inlet pipe is connected with the multipurpose one-way valve, hot water in the water heater can be used up. The utility model has the energy-saving effect.