There may come a time when your heating system stops functioning properly due to high or low-pressure problems. This occurs when too much pressure is lost or too much pressure is built up. In case you’re wondering how much pressure your boiler should have, you’ve come to the right place. Spotting the main cause and determining what boiler pressure is ideal, especially as we approach the winter season. Here is our quick guide to what exactly causes boiler pressure issues to arise and how to identify the main causes of your boiler issues.

What Is Boiler Pressure & How Does it Work?

In order for a boiler to function properly, water and air must be maintained in the right balance to maintain sufficient pressure when water is being produced, which usually occurs when hot water or heating is turned on. Pressure gauges are usually installed inside or underneath your boiler, in order to measure boiler pressure. The flow of water will not be adequate to heat your radiators or water if you have too little pressure.
By heating cold water, your boiler circulates the water in a circuit of pipes and radiators throughout your home. Water needs to be pushed by the appliance at the right pressure for it to function properly. There may be differences in the way your boiler works depending on the type you have. As an example, modern combi boilers control pressure with a filling loop connected to the cold water supply.

What Should The Normal Boiler Pressure Be?

The water pressure in your radiators should be one bar when they’re cold. It is generally accepted that any pressure below 1 bar is considered low, while anything over 2.75 bars is considered high. If you are wondering how to check the boiler pressure, the process is very simple. To begin with, you’ll need to find the pressure gauge on your boiler. The front of the appliance usually has this information. You will find two coloured sections on the pressure gauge – a red and green section. In some circumstances, the boiler’s pressure can rise

What Causes A Boiler To Lose Pressure?

There are many reasons why your boiler may have lost pressure. The most common causes are:

  1. Boiler Leak– A leak in a boiler is one of the most common causes of it losing pressure. Several parts of a boiler can break – the automatic air vents, washers, rings joints, and even diverter valves and heat exchangers. A substantial leak in a boiler will be obvious so you’ll see it drip from the bottom of the boiler when it occurs. Internal leaks that drip onto another surface are less noticeable, since they are often smaller and which makes them harder to detect.
  2. A System leakage – As you may have a suspected leak in your pipe system, you will need to conduct some investigation. The first step is to trace the pipes throughout your property. This will allow you to determine where the problem has occurred. You should pay special attention to the joints and bends of the system since they are the weakest parts. You should look for a small puddle of water like you would for a leaking boiler.
  3. Bleeding Radiators – Bleeding radiators involve releasing trapped air inside your heating system. Recent bleeding of your radiators may have caused your boiler pressure to drop. Luckily, diagnosing and fixing such a problem is straightforward. It is necessary to re-pressurize the boiler after recently bleeding radiators if you experience low boiler pressure. This can be accomplished by finding the boiler’s filling system, which consists of two taps and a copper pipe with connectors. A certified radiator expert usually bleeds your radiators and then checks the pressure of your boiler once he is finished with the job. When your boiler pressure is too low, he will re-pressurize it, so your heating system will stay healthy.
  4. A Faulty Pressure Relief Valve– A pressure relief valve is designed to relieve excessive pressure, which occurs when 3 bars of pressure are reached in a boiler. It is possible for a valve, whether internal or external, to become faulty and leak low-pressure water from the central heating system to a pipe outside the house when this occurs.

Any type of boiler pressure issue should be addressed as soon as possible by an engineer. Contact a member of our team today at 0161 696 0981 We’re more than happy to help.

How To Repressurise Your Boiler

Here are the basic steps to repressurise your boiler :

  1. The filling loop and pressure gauge should be identified. Filing loop handles should be positioned at a 90° angle to the pipe flow.
  2. Ensure that you can see the pressure gauge whilst accessing the filling loop. As a guideline, most sealed systems will operate at around 1.0 – 1.5 bar but always consult the manual for The system you use. Modern systems usually show the correct pressure level on the gauge.
  3. Turn off the boiler.
  4. Water should flow from both filling loop handles when you turn them to match the pipe’s direction.
  5. Make sure you don’t over-pressurise the boiler. Keep sight of the gauge at all times. You may need somebody to assist you if not possible by yourself. Once the correct pressure is reached, make sure the handles are closed fully.
  6. Lastly, turn the boiler back on and observe.

At MCR Gas we deal with many types of boiler issues. Whether it be for high or low-pressure boiler systems, MCR Gas are able to help. Not only do we handle all plumbing enquiries, but we provide boiler installation, boiler servicing, and boiler repair in Manchester and the surrounding areas. Contact us now for more information.