Deaerators are used to discharge continuously air from the hydraulic circuits of air-conditioning or solar thermal systems. The air vent capacity of these devices is extremely high. They are able to automatically remove all the air from the circuits, down to micro-bubble level. The circulation of fully deaerated water allows the systems to work under optimal conditions without any trouble of noise, corrosion, local overheating and mechanical damage. They are available in versions for installation to horizontal or vertical pipes. This particular series of deaerators has been specifically designed to work at high temperature with glycol solutions, typical condition of solar thermal systems.