How to Reduce Boiler Pressure the Right Way?

how to reduce boiler pressure

We’ll cover the main reasons why boiler pressure is too high in this guide, along with suggestions for lowering it.

A boiler system’s internal water pressure should typically range from 1 to 1.3 bars; consult your manual to determine its ideal range. Since all the components are intended to function within this range, if the boiler pressure is too high or low and falls outside of it, your central heating won’t operate as effectively.

How to restore normal boiler pressure after such occurrences are covered in the following article.

How to Reduce Boiler Pressure?

The next step is to lower the pressure once you’ve determined that it’s high in your boiler system. There are several ways to relieve this pressure, and we’ve arranged them in order of ease. However, not all systems can use all of the techniques.

The water in many (but not all) central heating systems is continuously cycled through a filter to remove impurities. They are ideal for releasing pressure in the system and serve as drainage valves as well.

The filter is typically found close to the boiler because, in order to provide the best protection for your boiler, it should be placed between the final radiator and the boiler. With a valve at the bottom, it will either be cylindrical or conical in shape.

Place a bucket beneath the filter, turn the valve on, and monitor the gauge. When it reaches 1 bar, shut the valve.

A drain-off valve, also known as a drain cock, might be present in place of a filter. This is in the central heating system’s pipework. If there is just one, it will probably be downstairs, though it could be anywhere and there could be several.

how to reduce boiler pressure

It will be a pipework-branching Y- or T-shaped component with a valve that may need a spanner to open. When checking the boiler’s pressure, place a bucket or tub underneath it and open it up. When it reaches 1 bar, close the valve.

Bleeding can be done to lower the water pressure in addition to releasing trapped air in the system. Radiator bleed valves are located on the radiator, a bucket or tub should be placed underneath or next to the valve, and the valve should be gently opened. We’ve written an article on this topic here.

You should cover nearby wallpaper and carpets as well because water will squirt out. If one of the aforementioned techniques isn’t available, bleeding a radiator will do the trick but is very slow.

If none of the above are available and you’re a confident do-it-yourselfer, you should only attempt this more specialized task. To gently unfasten a radiator nut connecting the pipework to the radiator, place a container underneath it and use a spanner.

You’ll get a much faster flow than with bleeding, so be ready for splashing and be ready to tighten the nut quickly if necessary.

how to reduce boiler pressure

What is the Cause of High Boiler Pressure?

There is a clear problem when the pressure gauge reaches or rises above 2 bars. There are several things that can cause high pressure in the boiler:

  • Recent boiler depressurization: Regardless of the cause, if you recently did this, the pressure may have been underestimated and is now increasing.
  • A water system that is overfilled with water: An increase in pressure may result from having too much water in the system.
  • Faulty components: Regardless of how new your appliance is, some components may stop functioning completely or partially, which could increase pressure.
  • Boiler lifetime: This is a common problem for units that are 10 years old or close to it. The age of your appliance may be a factor in a boiler losing pressure or running too high.

Signs That Your Boiler Pressure is Too High

What are the signs that the pressure in your boiler is too high? Here’s how to discover.

Check Your Boiler’s Pressure Gauge

Your pressure gauge ought to be your first stop. The display will either be an analog (pointer) display or a digital display, and it will be located on the boiler itself.

With a needle pointing to the pressure, an analog display will resemble a clock face or speedometer. It will have numbers around the edge, but it should also have some kind of indication of where the ideal range is, like a shaded area or two lines designating the maximum and minimum pressures.

An LCD, LED, or screen-type digital gauge that is multifunctional, i.e. it shows other information such as timers, temperatures, or whether the boiler is serving central heating or hot water. The pressure indicator can occasionally be reached by pressing a button to scroll through a variety of measurements.

how to reduce boiler pressure

If there is too much pressure, the screen might also display an error message. Details can be found in the boiler’s manual.

Is There Any Leakage from Your Central Heating System?

Another warning sign, in the unlikely event that the pressure gauge is broken, is leakage from your central heating system. It usually manifests itself at joints, frequently where pipework connects to radiators, where it begins at the weakest link.

It’s wise to check your tire pressure if you see puddles. However, you’ll also need to hire a plumber to fix the leak.

What Happens When Your Boiler Pressure is Too High?

What are the worst-case scenarios if the boiler pressure is too high? It’s not a minor issue or one you should ignore because your unit could begin to leak or some internal components could become damaged. Call a specialist for boiler repairs in London if there are pressure issues.

Modern boilers are built to withstand high pressure, and the majority of units should be safe. On rare occasions, however, an old boiler that has been neglected for a long time may explode. However, you shouldn’t rely on them. Pressure relief valves are present in some contemporary heating systems.

Boiler explosions are frequently caused by high pressure, but they can also occur for a variety of other reasons, like defective internal components.

What is Boiler Pressure? What is the Optimum Boiler Pressure?

The balance between air and water in your central heating system is what is most commonly referred to as boiler pressure. This is distinct from the water pressure associated with running faucet water.

The boiler pressure needs to be at an ideal level, which means it shouldn’t be too high or low for the boiler to function as intended. Low-pressure boilers may completely shut off your central heating system, preventing it from functioning.

On the other hand, a high boiler pressure overloads your system and makes it stop working.

The majority of boilers perform between 1 and 2 bars, though there is no clear-cut answer. Between 14 and 30 pounds per square inch (PSI) are represented by this. On the control panel of your boiler, a pressure gauge that displays this value and typically marks the pressure as a number out of a maximum of four bars is present.

how to reduce boiler pressure

Consult the user manual for your boiler if you require any additional guidance or assurance on this.

How to Prevent Boiler Pressure from Going Up?

Whether you know why there was an increase in pressure or not, there are steps you can take after the issue is resolved to stop it from happening again.

  • Be careful not to overfill the system.
  • Bleed the radiators frequently. By doing so, you’ll be able to release some air and lower the pressure inside your system.
  • Contact a dependable company to arrange routine boiler maintenance and service.
  • The two valves that allow water into the system should be closed in the filling loop. Leaving them open for too long will allow more water to enter your system, which will raise pressure once more.
  • Check your expansion vessel because it is the component of the system that maintains constant pressure and prevents abrupt changes.

Call a Gas Safe Registered engineer whenever you need to repair a central heating system, replace parts, or repressurize the boiler. These are not do-it-yourself projects, and if you attempt them, you risk doing more harm than good.

Conclusion: Check Your Boiler Pressure

Make sure to regularly check the pressure in your boiler and take action if it stays above 2.5 bars. If the issue persists, first make sure the filling loop or valve is properly sealed. Radiator bleeding should be done if this doesn’t fix the issue. Contact a qualified engineer if neither of these solutions works.

If you haven’t had your annual service in the last year, schedule one right away because it could reveal a problem with your system. Similar to the previous situation, if you keep experiencing high pressure without knowing why, it’s time to call a Gas Safe Registered engineer to inspect your boiler.


Should I Turn My Boiler Off If the Pressure is Too High?

For instance, an overfilled, leaking appliance can produce high pressure, which in turn can cause high boiler pressure and leaks. As soon as you spot the increased pressure and leaking water be sure to immediately stop the water supply and turn off the heating.

Will Boiler Pressure Go Down on Its Own?

This is normal. A boiler’s pressure will increase as it heats up and drops if it’s turned off. Even though the pressure only varies slightly, it does change. Due to water expansion throughout your system, the pressure rises as you demand more heating or hot water.

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