Water is an important vital resource, and must be protected and saved. Unfortunately, millions of liters of water are wasted annually at the national level in Peru, one of the factors is the discomfort when people take a hot shower, because first the water is cold, which is contained in the pipes of domestic connections with the heating tank, the cold water is wasted by sending directly to the drain until the water to be in a pleasant temperature, that means about 5 liters of water are wasted. The technology within engineering has carried out a variety of innovations that respond and solve problems related to water saving, that’s why, this paper proposes to create an automated system that saves the wasted water in domestic showers, the proposal is characterized by being sustainable, for its environmental and economic impact; solving in this way a latent problem of society as well as raising public awareness of the benefits of saving water. As a result, a preliminary prototype was obtained, which demonstrates the basic operation of the proposed system.