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How to bleed a radiator


Bleeding a radiator is when you let out air that has become trapped inside of it. Learning how to bleed a radiator might seem like a boring task, but it’s one of the best ways to improve energy efficiency and warmth in your house.

All systems require periodically check. Luckily, pushing the air out of the radiator is a very simple process that will not only help keep your home feeling fresh but could save you money on your bills because your radiators work alongside your boiler.

In this “How to bleed a radiator” guide we’re going to show you how to bleed a radiator to increase your central heating’s efficiency in your own house.

When to bleed a radiator

If the top part of the radiator is cold, while the bottom is warm, this is because air is trapped in the system (which should be filled with water). Bleeding the radiator releases this air and allows hot water to fill the whole system.

Steps to do before bleeding a radiator

If the whole radiator is cold, check that the radiator valve is turned up. If more than one radiator is cold, the whole system may need to be checked by a heating engineer.

Be sure to turn off the heating system before bleeding; else the pump might draw more air into the system. You will need a special radiator key, available from most DIY and hardware shops, and also a rag or cloth and a bucket or bowl.

How to bleed a radiator

1. Find the bleed valve, which should be the smallest square nut at the top end of the radiator.

2. Place the key over the valve and hold the cloth around it to catch any water. Gently turn the radiator key anti-clockwise until you hear a hiss – this is the air being released.

3. Once the noise has stopped, water will leak out. At this moment, turn the key back clockwise to shut the valve off. DO NOT unscrew the valve completely as the plug will come out.

Don’t wait until it’s too late. It could save you hundreds per year on your energy bills.

Thinking of selling or letting your home? Contact our teams; call us on 0800 862 0870 or book your free appointment today.

How to bleed a radiator
By Asif Kola