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What Is A Closed Plumbing System?

Plumbing systems can be classified as either open or closed. A closed system releases water through a fixture or appliance in a controlled and confined manner. On the other hand, an open plumbing system allows water to flow freely from the pipes and into the atmosphere.

How Does A Closed Plumbing System Works?

An open plumbing system is one in which water enters from a public supply and exits through drains. In contrast, a closed system functions as an ongoing cycle of pipes and fixtures where water circulates within a loop, never coming into contact with the outside world.

The water enters the system through a single point, usually a backflow preventer or pressure-reducing valve, and never exits unless through designated drains or overflows. This ensures that water flows in only one direction through which the contamination of the public supply is prevented. The water is kept flowing by pumps or gravity, guaranteeing a steady flow throughout the system.

Depending on the system’s intended use, boilers, heat exchangers, solar panels, and other devices may be used to heat or cool the water. The heated or cooled water then circulates through loops designated to transfer its temperature to the desired environment, such as radiators for heating or air handlers for cooling.

Benefits Of A Closed Plumbing System

The following are some significant benefits of closed plumbing systems that make them a desirable choice for particular applications according to a plumber:

Water Conservation:

In contrast to open systems where water pressure varies, closed loops’ constant circulation lowers the likelihood of leaks, which can result in substantial water savings over time. Additionally, closed systems retain all of the water within the loop which is evaporated, preventing needless losses.

Water Quality:

The controlled environment within a closed system minimizes exposure to air and contaminants, which can lead to corrosion of pipes and fixtures. This can extend the lifespan of the system and reduce maintenance costs. Water in the loop is explicitly treated and kept in such a way that it serves its intended purpose at the best possible quality. This can be especially beneficial for high-purity water applications, like medical or industrial ones.

Improved Efficiency:

Closed systems maintain a constant water flow, leading to consistent heat transfer or cooling in applications like hydronic heating and cooling systems. This can contribute to improved energy efficiency and comfort. Expansion tanks and pressure relief valves regulate pressure within the system, preventing damage to pipes and fixtures from thermal expansion or pump surges.


Closed plumbing systems provide a more effective, sustainable, and controlled water management method in particular applications. Although they may require more money initially to install, over time, they may save more money in water conservation, performance, and maintenance. However, it is essential to remember that only some situations call for closed systems. Open systems may be more affordable and suitable for basic domestic water supply and drainage needs. The decision ultimately comes down to your needs and the intended use of the system.

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