Boiler pressure: the complete guide for maintenance

Today we want to talk to you about boiler pressure  and all the actions you need to do to solve errors. We are sure that this guide will help you solve all those problems related to heating your home.

How many times have you found yourself with cold heaters without there being any circle of water in the radiators? 

How many times did you have to call the maintenance technician to solve small problems that made you feel cold? not to mention when you take a shower and the water drops cold.

With this guide you will finally know all the causes of boiler pressure which can thus save you a little money without calling a specialized technician. We would like to point out, however, that any boiler they require requires scheduled maintenance as required by law.

Boiler pressure: what are we talking about?

All boilers, whether they are condensing or sealed chamber boilers, need to periodically check the boiler pressure, i.e. the atmospheric pressure of the water inside the pipes and the whole system, including the boiler,

How do you check the boiler pressure? The pressure of the heating system is controlled thanks to the pressure gauge which is located near all the control knobs and usually on the metal casing of the boiler.

The boiler pressure reference values ​​are:

·         166 bar

·         1.5 bar

Always take care to set this pressure value with the heating system off and with the radiators (radiators) cold.

Why does the boiler pressure drop?

Now we describe the reasons why you have a drop in boiler pressure with the consequence that your heating and hot water system goes into lockout.

Air present in the system

When there is air inside the system, the pressure of your boiler starts to drop until it is totally blocked. This air certainly entered somewhere so you may find yourself in case your system has a small air inlet hole often.

Loss of water from the system

This is the most common case for all houses of a certain age. In practice there is a leak usually found in radiators or radiators and this causes the air to take the place of the water that comes out.

Expansion vessel

do you know what the expansion tank is? it is that device that is inside the boiler and is used to keep the boiler pressure constant and below 3 bar when you have the whole heating system in full operation.

If this vessel deflates or holes at this point you will have a sudden drop in boiler pressure. At this point the only option is to call your qualified technician for replacement.

Evaporation after a long summer season

As soon as the winter begins, it is always recommended to check the boiler pressure because as you will have understood from this title it may be that there has been an evaporation of the water, obviously natural evaporation.

How to increase the boiler pressure?

Now that you understand why the pressure of your boiler has dropped, you need to take action and increase the value of the bars so as to avoid remaining in the cold or without hot water.

First you need to find the water tap. usually this is located below the boiler itself. This is a faucet usually with a black knob, you shouldn't struggle to find it.

To increase the boiler pressure you must follow the following operations.This operation is to be done by two people for an excellent result

Turn off the heating

Keep the boiler on but without heating it up

·         At this point a person empties the air from the heaters

·         The other person instead opens the tap and checks the rise of the hand

·         As you proceed keep the tap open

·         Close the tap when reaching 1.5 / 1.6 bar

What happens if I have loaded the boiler pressure too much?

Don't worry, the house doesn't blow up but obviously you have to do a very simple operation.

Open the drain valve of one of the radiators and drain the water until the boiler pressure hand reaches 1.5 / 1.6 bar as we have described above.

I did everything but the pressure doesn't go up: what to do

The operation we have just described to increase the pressure of your boiler has no margin of error. By this we mean that if the pressure doesn't rise then there are other problems.

At this point you have to put your hand in the wallet and call Electrical Repair specialized technician to help you solve a problem. But the question is, "how do I call the technician for my boiler?"

On each boiler there is a sticker with the brand of the same and usually the telephone number of the technician in charge of solving the problems of that specific brand.

If, on the other hand, your boiler does not have the technician's sticker with the telephone number, then go to the internet and enter the name of the boiler and then write "technical assistance". You will see that you will immediately find the company that will be able to solve the problem.

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