How to Bleed a Radiator Heating?: A Step-by-Step Guide
A properly functioning heating system is essential for keeping your home warm and comfortable—especially during the colder months. If your radiators aren’t heating up properly (warm at the bottom but cold at the top), they may have trapped air inside. This is a common issue that can reduce the overall efficiency of your heating system.
Learning how to bleed radiator heating is a quick and simple way to fix this. It helps improve energy efficiency and can even lower your heating bills. Follow the step-by-step guide below to bleed your radiator safely and effectively.
Step 1: Gather your tools
Before you begin, you’ll need:
A radiator bleed key (available at most hardware stores)
A cloth or small container to catch any drips
Gloves (optional, but helpful)
Step 2: Turn off the heating
Make sure your central heating system is completely off. Allow time for it to cool down—this prevents hot water from escaping during the bleeding process.
Step 3: Locate the bleed valve
The bleed valve is usually found at the top of your radiator on one end. It looks like a small square or slotted screw.
Step 4: Bleed the radiator
Insert the radiator key into the valve and slowly turn it anti-clockwise. You’ll hear a hissing sound as the trapped air escapes. Hold your cloth or container underneath to catch any water.
Step 5: Close the valve
Once a steady stream of water starts to flow out, all the air has been released. Turn the valve clockwise to close it—be careful not to over-tighten.
Step 6: Check your boiler pressure
Bleeding radiators can lower the pressure in your system. Check your boiler’s pressure gauge and top it up if needed, following your boiler manufacturer’s instructions.
Step 7: Turn the heating back on
Switch your heating system back on and check the radiator. It should now be warm from top to bottom. If cold spots remain, you may need to repeat the process.
When to call a professional
If your radiators still aren’t heating evenly, or if you hear strange noises or notice a significant pressure drop, it might be time to seek expert help.
At JWD Heating & Plumbing, we’ve been helping customers with heating issues for over 20 years. While this guide should fix most minor problems, our professional engineers are here if you need further assistance.
How to Bleed Radiator Heating – Final Thoughts
Regular radiator maintenance, including bleeding, is key to keeping your heating system running smoothly. If you’re unsure about the process or have concerns about your home’s heating, get in touch with JWD Heating & Plumbing today. We’re here to help!
