Weil McLain 640-000-087 1/2″ Air Separator

Description

The Weil McLain 640-000-087 is a 1/2″ Air Separator engineered to maintain peak performance in hydronic heating systems. By continuously removing entrained air and microbubbles from the circulating water, this air separator helps prevent noise, corrosion, and efficiency loss — common problems caused by air pockets in closed-loop hydronic systems.

Weil McLain is a trusted name in hydronic heating, and this air separator is designed to integrate seamlessly with boilers and hydronic distribution systems where reliable air removal is critical to system longevity and comfort.

Key Features

• 1/2″ connection size for compatibility with residential and light commercial hydronic piping
• Removes entrained air and microbubbles from circulating system water
• Helps reduce noise caused by air pockets in the distribution loop
• Protects system components from corrosion associated with dissolved oxygen
• Designed for use with Weil McLain boilers and compatible hydronic heating systems
• Compact design for easy installation in tight mechanical spaces

Applications

• Residential and light commercial hydronic heating systems
• Hot water boiler distribution loops
• Radiant floor heating systems
• Baseboard and panel radiator systems

Why Air Separation Matters

Entrained air in a hydronic system reduces heat transfer efficiency, causes circulator pump noise, and accelerates internal corrosion. Installing a quality air separator like the Weil McLain 640-000-087 at the point of lowest solubility — typically near the boiler outlet — ensures air is captured and vented before it can circulate through the system. The result is quieter operation, longer equipment life, and more consistent comfort throughout the building.