How to bleed the radiators

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Now that the cold has already reached the homes of all Spain, It is important to have in perfect condition all the heating systems that are inside the house. Radiators is a fairly used and common heating system in Spanish houses because of how effective they are.

These appliances need a purge every year, to ensure that they work correctly when the coldest months of the year arrive. Thanks to the purge, the hot air comes out without any problem, heating the different rooms of the house. In the following article we give you the keys and the steps to follow to purge the radiators.

What is to bleed the radiators

The process of bleeding the radiators consists of removing all the air that may be in the pipes of the appliance to the outside. The accumulation of air can be due to three reasons:

  • Due to the evaporation that the water inside the radiators has suffered.
  • Because the water supply to the radiators has been shut off.
  • For the lack of use of such radiators.

That air accumulates inside the radiators is something totally normal so there is no need to worry. This purge must be done in all types of radiators to get the hot air out without any problem. The purge is usually carried out through a valve that all radiators carry. It is a fairly simple and easy process that can be done by the owner or a professional.

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Why you should bleed your radiator

Bleeding is essential for your radiator to function perfectly and without any problem. If you clean the appliance well, the air will circulate perfectly inside and the desired heat will come out to heat the house.

Apart from this, if the air remains inside the radiator for a long time, it can damage the device itself. There are many cases in which the air is not removed in time and its corrosion makes it necessary to change the radiator for a new one.

Bleeding the radiators is something that must be done every year so that these appliances work properly and in this way, heat the home much faster. This is important when it comes to saving on the electricity bill and not wasting more than necessary during the winter months.

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When to bleed the radiators

It is advisable to start bleeding the radiators before the cold months arrive. Before starting the heating for the first time, it is good to bleed the radiators that are throughout the house.

To know if the radiator has air inside you must take into account two aspects:

  • The top of the radiator is cold.
  • When you turn on the radiator you hear a noise reminiscent of a gurgling.

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Steps to follow to bleed the radiators

Radiator purging can be done manually or automatically. If the appliance is made of aluminum, it is very likely that it has an automatic drain. In this case the person should not do anything, since the device itself is the one that expels the air when it notices a lot accumulates inside.

  • In the event that the radiator does not have an automatic drain, purge in a manual way following a series of steps:
  • First the radiator must be off to get let the air rise to the top of the appliance.
  • The next thing you should do is place a glass or bowl under the purger so that water falls into the containers during the purging process.
  • Then you must take a flat screwdriver and turn the bleeder screw counterclockwise. You must do it little by little to avoid that a lot of water can fall.
  • By turning the screw, the air accumulated inside the radiator will gradually escape. When there's hardly any air left inside some water will start to come out.
  • If water starts to come out continuously this is the moment when you have to close the drain.
  • It only remains to check that the radiator pressure is perfect. The ideal would be between 1 and 1,5 bars.

As you have seen, bleeding a radiator is not complicated at all and anyone can do it without any problem. Remember that the purging of the device must always be done so that it works perfectly. There are many people who do not bleed the radiator and putting it on during the winter does not work as it really should. It costs nothing to get the air accumulated inside and have it ready so that it can give heat to the different rooms of the house.


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