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Why Bleeding Your Radiators is Important

By June 16, 2025No Comments

When it comes to keeping your home warm and heating system running efficiently, bleeding your radiators is a simple but important job that is often overlooked. If you have noticed your radiators aren’t heating up properly, they may need bleeding.

At BGHC Plumbing and Heating, this month’s blog looks at the importance of bleeding your radiators. For information, call us in Glasgow on 01355 201 202.

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What is ‘Bleeding a Radiator’?

Bleeding a radiator means releasing trapped air within the system. The air prevents hot water from circulating properly, which leads to uneven heating, cold spots and a boiler working harder than it should.

Why is Bleeding Radiators Important?

Improves Heating Efficiency

Air pockets in your radiators can prevent them from heating fully, so you are not getting the warmth you are paying for. By bleeding the radiator, you allow the hot water to flow freely through the entire system.

Reduces Energy Bills

When radiators aren’t working efficiently, your boiler works harder to reach the desired temperature. This uses more energy. Bleeding your radiators helps your system perform at its best, which can save you money on heating bills.

Extends the Lifespan of Your Heating System

Over time, trapped air can lead to corrosion and sludge build up. Regularly bleeding your radiators helps to keep the system clean and prevent costly breakdowns in the future.

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How to Tell if Your Radiators Need Bleeding

There are several common signs that means you need to bleed your radiators:

Radiators are cold at the top and hot at the bottom
You hear gurgling noises when the heating is on
It takes longer than usual to warm up your rooms

Tools Needed to Bleed Your Radiators

To bleed your radiators, you will need:

Radiator key: This is a tool designed to fit into the bleed valve, allowing you to open it easily.
Cloth: Use this to catch any water that sprays during the bleeding.
Small tub: Place this under the radiator to catch excess water.

1. Turn off Your Heating

Switch off your central heating and let the radiators cool. This ensures safety and prevents hot water from spraying.

1. Turn off Your Heating

Switch off your central heating and let the radiators cool. This ensures safety and prevents hot water from spraying.

2. Identify the Radiator Bleed Valve

Find the valve on your radiator. It is often at the top on one side and resembles a square or hexagonal nut.

3. Insert the Radiator Key

Insert the key and turn it anti-clockwise. You should hear a hissing sound as the air escapes.

4. Check for Drips

After bleeding, inspect the valve for any signs of drippage. If you notice any, gently tighten the valve until the drip stops. Be careful not to over-tighten.

5. Check your Boiler Pressure

Bleeding your radiators can cause your boiler pressure to drop. Once you have finished, check the pressure gauge. If it is too low, you may need to top it up. Please refer to your boiler manual.

6. Turn Your Heating Back On

Once you have bled the radiators, turn your heating back on and check for even heat distribution.

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For more information about our central heating and plumbing services, contact BGHC Plumbing and Heating. Call us in Glasgow on 01355 201 202. You can also send us a message via our contact form.

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