What is an Air Separator ?

An air separator is a device installed in a hydronic boiler system to remove trapped air from the circulating water.

Here’s how it works and why it matters:

Purpose When air gets into the water loop it causes:

• Poor water circulation

• Noise in the pipes (gurgling or banging)

• Hot and cold spots in radiators or zones

• Corrosion inside the boiler and piping

How It Works ?

• The separator is installed near the boiler supply outlet where the water is hottest and air is easiest to release.

• As water flows through the unit slows the flow and creates a low pressure area.

• Tiny air bubbles rise and collect inside then vent out automatically through an air vent at the top.

Types

• Air scoops: Simple design works best in smaller systems.

• Microbubble air separators More advanced remove even microscopic air.

Result You get a quiet balanced and efficient heating system with steady circulation and less wear on pumps.