Useful Guide on How to Bleed a Radiator without Bleed Valve

Well you can find a solution to that problem right here and now. This article will introduce to you how to bleed a radiator without bleed valve in a detailed and easy to understand guide.



So your room is kind of chilly lately even when your hot water radiator is still running around the clock. But then upon close inspection did you find out that the heat generated by the radiator? is considerably lower than the number you set it to work on?

Naturally, you want to get the radiator back to work as it should be as fast as possible so bleeding the radiator seems to be a good option. Yet the bleed valve looks like not to be present anywhere on the radiator.

In need of a solution to solve this problem? Well this article got a good one for you.


As the name suggests, hot water radiator utilizes constant streams of hot water to generate heat for your room. The water is heat up at a boiler then goes through a series of pipes to get to each of the radiators in your house then go back to the boiler once again.

After in use for a long time, this loop may be exposed to air and when the air goes through the radiator, part of the air will be trapped inside. Eventually, the trapped air will accumulate to a level that severely reduced the radiator ability to work properly.

This is when you need to use the bleed valve. But no worry if you can’t find the valve anywhere on the radiator, the article will provide you with helpful tips and tricks on that subject.

So that and you can do the entire process by yourself in the comfort of your house, but first lets’ see what you are going to need to have to get the job done nicely and safely.


Bleed valve exists on pretty much every hot water radiator and some models just happen to place the valve in unusual position. You radiator valve probably fall into the second group so all you need to do is to uncover it.

Since you are dealing with very hot water here, you must take precaution and equip protective clothing such as gloves and goggles. It’s wise to stay concentrate at all time and apply appropriate techniques that are also shown below. Besides that, a screwdriver and rags are enough.

And just one more thing, check your radiator warranty terms and conditions carefully. You may have to remove and slightly graze the radiator surface to find the valve which may void the contract entirely. This is even more important when you need to replace radiator later so be on guard.


• Step 1: Inspection

First, you will need to turn all the radiators in your room and exam them to see how many you need to bleed. The one that got a considerable air accumulation will have cool spots all over the surface.

This is a notable sight that your radiator is eating up energy while delivering little in return. After you have decided which radiator need to be bled, time to shut down the entire system.


Before you attempt to do anything with the radiator, you better make sure that the temperature is safe to work with. Turn off the valve that connects the radiator to the pipes and also shut down the boiler, just to be safe.

Now you need to leave the entire system completely cool down in a few hours before inspecting the radiator. Again, do remember to wear protective when you handle the radiator.

• Step 2: Find the bled valve and use it

In most models of hot water radiators, the bleed valve is usually located at the top and to the side of the radiator. In order to operate it, you will need to use a bleed key, flat – headed screwdriver or alike.

In order for the trapped air to get out, you need to turn the valve counter – clockwise. After that, you will hear a “hissing” sound of trapped air getting out and when the sound stop. Close the valve and the bleeding is done. There will be water leaking from the valve so use the rags to wipe them off.

But that is the easy part, the hard part comes before that which is to actually locate the bleed valve. As mentioned before, bleed valve may be located elsewhere apart from the top of the radiator. Here are a few hints for you.

Check every corner of the radiator and not just the surface. Detach the radiator to see if there is any “unusual” bolt or screw in or around it. The bleed valve is small and its appearance may fool people into thinking that.

It’s just a normal button or unimportant part of the radiator.


Photo via

If you still can’t find the valve, chances are its cover by a protective layer. You will need to look out for a small and rounded cut on the radiator then try to graze or pry it open.

This should let you access to the bleed valve and operate it. But you need to do one more thing to bring you radiator back to effective operation.

• Step 3: Use the end cap (Optional)

In the rare case that you still can’t find the bled valve then this is the final solution: Loosen the end cap. For this to work you will need to use a wrench. Warp the wrench around the end cap of the radiator, tighten the grip and slowly turn it counter – clockwise.

The moment you the familiar “hissing” sound, stop and wait for the sound the stop. When you see water coming out then the trapped air is finally gone so quickly tighten the cap by turning the wrench clockwise. You are done then just move on to the next step.

wrench around the end cap of the radiator

• Step 4: Pressurizing

When all the trapped air has finally escaped, the boiler pressure must have changed a bit from the usual setting so you need to go there and check. If you see the pressure is not suitable then you have to adjust it.

What you need to do here is to look for the central filling loop. It’s a pipe that connects the boiler to the water source hence you can find it near the boiler. Re – pressurize the central heating – filling loop up to your preference and your radiator efficiency should be good as new now.

your radiator efficiency should be good


And that is the end of this guide, not too hard to take in, right? Hot water radiator is a good choice to create a warm atmosphere in your house, especially in cold weather.

And there is nothing more frustrating than to still feel chilly when you had paid the bill and let the radiator on at all time. To annoy your further, you can’t find the bleed valve anywhere. So you can’t get the radiator back to work as it should be.

Well you can get out of this dilemma simply by reading this article. With it, you can gather the suitable tools and apply appropriate techniques to find and operate the bleed valve all on your own.

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