What device is commonly used to bleed air from hydronic systems?

The device commonly used to bleed air from hydronic systems is an air vent. In hydronic systems, air can become trapped in the pipes and radiators, which can lead to inefficient heating and potential damage to the system. Air vents are specifically designed to allow trapped air to escape while maintaining the water pressure within the system.

When air accumulates, it can cause noise and reduce the system's effectiveness, as the presence of air can disrupt the flow of water. Air vents are strategically placed at high points in the system, where air tends to rise. They can either be automatic or manual; automatic air vents open and close on their own to release air, while manual vents require the operator to open a valve to let the air out.

This functionality highlights the importance of an air vent in maintaining the efficiency and longevity of hydronic systems. By ensuring that air is effectively eliminated from the system, the air vent enables optimal performance and helps prevent issues related to air obstruction in piping.