Boiler Pressure Too High? How To Reduce Pressure From Your Boiler

Your boiler is a specialist and expensive piece of equipment that is the beating heart of your central heating system. Because it is often hidden away in an airing cupboard, it is something that can easily be forgotten or neglected. Yet, neglecting your boiler can be a very costly error requiring a new boiler, which can easily be avoided with a little care and attention. Modern boilers are a lot more complicated and require tools, technology, and expertise to service them, but there is one key factor that every homeowner should pay attention to – your boiler pressure. For a boiler to operate efficiently, it needs to function within a relatively small pressure window when it is running. Our advice is to check the pressure in your boiler every two weeks or so, a process that should only take a matter of seconds. If you notice that the pressure is too high or too low, you will quickly be aware that there is an impending problem and can take preventative action to ensure a more serious issue does not develop.

Expansion Vessel & Boiler Pressure GaugeWhat Happens If Boiler Pressure is Too High?

The first thing you need to understand is what boiler water pressure actually is. In layman’s terms, it is the balance of water and air within your central heating system. If your system’s pressure is too high, it could cause water to escape out of the pressure relief valve. The solution to this problem is to release pressure in the system, so let’s have a look at how you can do that.

How To Lower Pressure In A Boiler

Option A – Too Much Water In The System

The number one cause of high pressure in your boiler is too much water in the system. Sometimes, this can be self-inflicted when a homeowner has been dealing with low pressure in their boiler and has tried to repressurise it. When checking your boiler’s pressure, it is vital to ensure that the boiler is switched off. When your boiler is on and driving the central heating system, the system’s pressure naturally increases and will give you an incorrect reading. If the pressure gauge shows anything above 1.5 bar, then your boiler pressure is too high, and you need to release pressure in the system.

Do not worry; this is a quick and easy fix and doesn’t require much technical knowledge. Your first step is to bleed the radiators. Purchase a radiator key from any good DIY store, and slowly turn the valve on the top corner of your radiators anticlockwise.

Initially, you should hear a hissing sound, which is the air escaping; eventually, the air should stop and be replaced by water. Let a millilitre or so of water out, and then tighten the valve again. After doing this on each radiator, you should check the boiler pressure gauge to see the difference it is making. Your aim is to ensure that the needle returns to the gauge’s green section on your boiler. Once you have achieved this target, then your pressure is within the correct parameters, and you have nothing to worry about.

Option B – Defective Boiler Parts 

Although this will require the services of a professional, it is still something that you may be able to diagnose. There could be a problem with any number of different parts, including the pressure release valve, the diverter valve, or the filling loop, all of which you should be able to spot even without any knowledge or expertise. The pressure release valve is a relatively simple piece of equipment that releases water when the boiler pressure gets too high. To locate it, search for a copper pipe, which generally can be found outside your home, on the wall behind your boiler. This pipe should not be dripping water constantly, so if it is, it is a clear sign that there is some kind of issue. If you see this, then, unfortunately, you need to call in a Gas Safe boiler engineer to deal with the issue.

The thing to remember is that most boilers have a lifespan of anywhere between 8 to 10 years, so unless you are particularly unlucky, any boiler under 6 is unlikely to develop an expensive fault. However, it is worth remembering that undertaking any work on a boiler is best left to the professionals, so be careful. If in any doubt, contact a Gas Safe qualified boiler technician.

Who you need to call for your boiler problem…

Here at ADI Leak Detection we are specialists at finding water leaks on central heating systems, a common problem when solve is when a boiler is losing all its pressure in a day from a hidden water leak!

If your boiler pressure is too high then you need to source a local plumber by searching Google for a plumber near me. 

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