We completed the installation of a centralized domestic hot water system on a multi-story rooftop in Los Angeles. Our team integrated a Navien Tankless Water Heaters with a large storage tank to provide a consistent supply for the entire facility. We carefully positioned the equipment on the flat roof, ensuring all components were properly secured with a manifold and metal strapping for long-term stability. This installation utilized Grundfos circulator pumps to manage water distribution and system safety efficiently. We installed a network of copper piping along with an Amtrol expansion tank to maintain consistent system pressure. The resulting configuration offers a high-capacity heating solution built to handle the heavy demands of a commercial-scale building.