Have you noticed cold spots on your radiators or strange gurgling noises from your heating system? This is one of the common signs which indicate that you need to bleed your radiators. This straightforward task removes trapped air from your heating system, helping run like it used to.

Why Do Radiators Need Bleeding?

Radiators require bleeding when air becomes trapped within the heating system. This typically occurs during maintenance, when radiators are removed or replaced, or due to small leaks in the system. Air can also enter when water levels in the system drop, allowing air to be drawn in.

The presence of air in your radiators can lead to several issues:

1. Cold spots

2. Gurgling noises

3. Inefficient heating

4. Uneven heating

Step by Step Guide To Bleed Your Radiators

What You'll Need

Before starting, turn off your heating system and allow it to cool completely to avoid burns. You'll need a radiator key (or a flat-head screwdriver for some modern radiators) and an old cloth or towel to catch any water. You can purchase a radiator key from most DIY shops.

Finding Your Bleed Valve

First, locate the bleed valve at the top of your radiator - it's usually a small, square-shaped nut or slot on one side. Most commonly, you'll find it on the top corner, opposite to where the pipes enter the radiator. Modern radiators might have a slot for a flathead screwdriver instead of the traditional square nut.

Opening the Valve

Insert your radiator key or flat-head screwdriver into the valve and turn it anticlockwise about a quarter turn. Don't unscrew it completely - you just need a small opening to let the air escape. You'll hear a hissing sound as the air escapes, which is completely normal. Hold your cloth underneath to catch any water droplets, as the water can sometimes be dirty and might stain carpets or flooring.

Completing the Process

Wait until the hissing stops and water begins to flow steadily - this indicates that all the trapped air has been released. Quickly turn the valve clockwise to close it. Make sure it's firmly closed to prevent any leaks, but be careful not to overtighten as this could damage the valve. For best results, repeat this process on all your radiators, starting with the one farthest from your boiler. This systematic approach ensures the most effective removal of air from your heating system.

Final Check

Once you've finished bleeding all radiators, check your boiler's pressure gauge - if it's below 1-1.5 bar, you may need to top up the system. This is quite common after bleeding radiators, so don't be alarmed if the pressure has dropped. Your heating should now work more efficiently, with radiators warming up evenly from top to bottom.

Common Issues With Bleeding Radiators

No air release

If you don't hear any hissing, the valve may be stuck. Gently tap it with a screwdriver handle to loosen it.

Continuous water flow

If water keeps flowing after bleeding, the valve may be faulty and require replacement.

Difficulty turning the valve

Apply penetrating oil and wait before trying again. If it's still stuck, consult a professional.

Leaking valve

Tighten the valve carefully. If leaking persists, the valve may need replacing.

Radiator still cold after bleeding

This could indicate a more serious issue, such as a pump problem or sludge buildup in the system. Consider professional assistance.

By following these steps and precautions, you can effectively bleed your radiators, improving your heating system's efficiency and your home's comfort.

Speak with a plumber in Horsham, Billingshurst, Storrington, Pulborough and rest of West Sussex

Simply get in touch by calling us on 01903 740538 and we'll be happy to help.