bleeding radiator

If your heating system isn’t working as efficiently as it should — for example, your radiators feel cold at the top but warm at the bottom — it’s likely they need bleeding. Trapped air inside the radiator stops hot water from circulating properly, leaving your home feeling chilly and potentially increasing your energy bills.

Luckily, bleeding your radiators is a simple task you can do yourself with minimal tools. Here’s everything you need to know.

Why do radiators need bleeding?

Over time, air can enter your central heating system. This air rises to the top of the radiator and prevents it from heating fully. By releasing (bleeding) this air, you’ll restore proper circulation, improve heating performance, and save energy.

What you’ll need

• A radiator bleed key (you can find high-quality options here)
• A cloth or small container to catch any drips
• A towel to protect your floor

Step-by-step: How to bleed your radiator

1. Turn off your heating

Make sure your heating is turned off and the radiators