Every long-haul marine vessel houses standard living amenities for crew and passengers. On larger marine vessels, there is often multiple washrooms, shower facilities, maintenance facilities, and kitchens scattered throughout the vessel. Each one of these amenity applications requires a high pressured flow of hot, portable water. Hot water circulation systems are designed to provide safe, potable hot water with no delay to users. Marine hot water circulation systems source and distribute water from the vessel’s onboard water treatment, or desalination, plant.