Automatic return system for hot water recovery in the shower

The objective of this work was to design, build and install a device to recover the water wasted in low-cost showers, while waiting for the liquid to reach a comfortable temperature. The novelty of this work is that anybody with basic knowledge of Arduino®, or other open-source microcontrollers can build the system, recovering water and at the same time reducing costs. The system can be installed in any home using the existing water pipelines. In addition, it has a functional, compact and adaptable structure, which does not require modifications in the hydraulic installation nor affect the aesthetics of the place where it will be installed, thus facilitating its implementation in any residential home without the need of complex or expensive renovations.