A closed system in plumbing refers to a water system where the incoming cold water supply is isolated from the exterior atmosphere, preventing water from escaping or entering beyond a controlled point. This type of system is common in heating and cooling systems, where water is circulated without direct exposure to the open air, reducing the risk of contamination and maintaining pressure stability. Closed systems are designed to maintain water quality, prevent backflow, and minimize evaporation, making them more efficient for heating applications like boilers and radiant floor heating. To manage pressure buildup due to thermal expansion, closed systems often incorporate devices like expansion tanks, pressure relief valves, and backflow preventers. Regular maintenance, such as checking for leaks and ensuring proper operation of safety devices, is essential to maintain the integrity and performance of closed systems.
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