To optimize building performance, it is vital to consider the water-energy nexus in a building. Because water itself has multiple purposes, there is a variety of potentially impactful strategies to consider, including hot water, heating and cooling. Based on data-driven case study findings, this session investigates the challenges, benefits, and alternative approaches available. In addition, we’ll explore the metrics by which benefits are evaluated as payback time, water/energy savings, environmental impact, and lifecycle costs should all be part of the equation.