Bleeding Radiators

Understanding the Issue

Radiators may become partially cold—especially at the top—when air gets trapped inside the system. This prevents hot water from circulating properly, reducing the efficiency of your heating and making rooms feel colder than expected. This issue is particularly common when the heating is switched back on after summer or following any disruption to the boiler system.

Signs Your Radiator May Need Bleeding

The top of the radiator is noticeably cooler than the bottom

• The radiator takes a long time to heat up
• You hear gurgling or bubbling noises
• Rooms feel colder even with the heating on

What You Can Do

Bleeding a radiator releases trapped air, helping restore even heat distribution. This is a straightforward process if you have a radiator key and feel confident carrying it out safely.

Before You Begin:

• Turn off the heating and allow the radiator to cool
• Place a towel or container under the bleed valve
• Slowly open the valve using a radiator key
• Close it once water begins to trickle out steadily

If you're unsure at any point or don’t have the tools, please do not attempt this. Contact our maintenance team instead.

Safety Reminder

Only attempt this task if you feel safe doing so. The water inside may still be hot, and incorrect handling can cause injury or damage. If in doubt—leave it to us.

When to Report It

Contact us if:

• Bleeding the radiator does not improve heating
• Multiple radiators in the home are affected
• There are signs of leaking or corrosion
• You can’t locate the bleed valve or don’t have a radiator key

Prevention Tip

Occasionally bleeding your radiators (once or twice a year) can help maintain efficiency—particularly just before winter sets in.