How to Bleed the Heating System

Throughout the life of your boiler, you might have to bleed the radiators a couple of times. Bleeding the radiators helps to reduce pressure within the system and get the boiler working properly. Bleeding can also help to get the air out of the system can help to restore heat output. It may sound complicated, but it’s the opposite. It’s a simple procedure and when you follow the right steps, it’s relatively safe. If you’re faced with the challenge of bleeding your boiler and you don’t know what to do, this handy guide will walk you through each of the steps.

Pump up the System

To get the best results from bleeding the system, you need to tune the central heating into full settings and wait for the radiators to reach maximum heat. Because you will be working with the system when it’s hot, you have to be careful not to burn yourself. Once the radiators are up to speed, you need to feel around the radiators cautiously to feel if any parts of the radiators have cold spots. Cold spots indicate the presence of trapped air, which means you need to bleed the radiators with the cold spots.

Turn off the Heating

Once you know which radiators are having challenges, you need to turn off the heat before you start opening and turning things. You have to make sure the radiators have completely cooled.

Open the valve of the Heating System

In most modern boilers, you can open the valve using a screwdriver. If that’s not possible, you need to find the ‘bleed key.’ Your boiler comes with the bleed key and also a bleed valve which is what you’re supposed to open.

The bleed valve is a protrusion at the top of the heating system. Once you locate the valve and the bleed key, use the key to open the valve a couple of inches to let the unnecessary air to escape. Once the air starts escaping, you should hear a hissing sound. Bleed the valves until the hissing stops and water starts sipping out then you can close the valve. Have a cloth or a rug on the floor to catch any water that escapes from the radiator just to be on the safe side.

Is your boiler leaking? check out our blog on How To Fix A Leaking Boiler.

Reduce Overall Pressure

For homes with a sealed heating system, you have to reduce the overall pressure of the radiator. This helps to keep the volume of the water and the presence of the air at sustainable levels. If you have any problems, you can consult with the manual provided with your heating system.

Cleaning Up

Once the hissing sound stops, you can turn back the valve and make sure it’s tight. Now that the job is done, you have to clean up. If you had a cloth on the floor, it takes most of the cleaning work out of your hands. If not, you have to wipe any spills on the floor. Also, double-check to make sure all the valves are properly shut, so they don’t leak.

Moment of Truth

You have to check if the fix works by running the system. Once more, fire up the boiler and let the radiators heat up. Once they are nice and hot, feel around to see if there are any cold spots. If the fix worked, you shouldn’t feel any. If the problem persists, it might be time to call in an expert to identify what the problem is and have it fixed.

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