Bleed radiators or in-floor loops

Why It Matters

Air trapped in radiators or in-floor loops causes cold spots, gurgling noise, and forces the system to work harder to heat evenly.

Tools

• Radiator key
• Small bucket or towel

How to Do It

1. Locate each radiator in your home and find its bleed valve, typically a small square or slotted fitting near the top of the radiator.
2. Place a small bucket or towel beneath the valve to catch any water that drips out.
3. Insert the radiator key and turn it counterclockwise slowly until you hear hissing as trapped air escapes.
4. Hold the valve open until hissing stops and water flows out steadily, then close the valve by turning the key clockwise.
5. Repeat at each radiator throughout the home.
6. For in-floor loop systems, locate the manifold and consult your installer's documentation to identify the correct bleed points and procedure.

Related Tasks

• Check hydronic system water pressure Once a year
• Clean hydronic heat pump outdoor unit Once a year
• Clear snow and ice from hydronic heat pump outdoor unit Once a year
• Schedule hydronic heat pump tune-up Once a year