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Boiler Pressure Too High: Causes & Fixes

Maintaining proper boiler pressure is crucial for the unit’s efficient operation and overall safety. If you’ve noticed that it’s consistently high, it’s important to understand the causes and fixes to prevent long-term damage and ensure optimal performance. 

In this article, we’ll explore the common causes of high boiler pressure and provide practical solutions to resolve the issue.

Understanding boiler pressure

Before diving into the causes and fixes, let’s start by understanding what it is and what’s considered a normal range. 

Boiler pressure refers to the force exerted by the water inside your unit’s system.

It’s typically measured in units of bar. A normal level usually falls within the range of 1 to 1.5 bar.

The consequences of high boiler pressure

Operating your boiler with excessively high pressure can have several negative effects. 

For one, it can increase energy consumption, leading to higher utility bills. It can also put unnecessary strain on your unit, reducing its lifespan and potentially causing irreversible damage.

A high boiler pressure poses safety risks, such as the potential for leaks or even explosions. Understanding the causes and addressing this problem promptly is essential to maintain a safe and efficient system.

The causes of high boiler pressure

There are several potential causes of high boiler pressure, some of which necessitate repairs or complete and costly boiler replacement. Let’s examine them one by one.

Faulty pressure relief valve

The pressure relief valve is designed to release excess pressure from the system. If this valve becomes faulty or fails to operate properly, it can result in buildup.

Expansion vessel issues

The expansion vessel is a key component that absorbs the expansion of water as it begins to heat up. If the vessel is damaged, it can lead to increased pressure.

Faulty pressure gauge

The pressure gauge provides a visual indication of levels. If the gauge is faulty or inaccurate, it may display higher levels than the actual reading, leading to a false alarm.

Water inlet valve problems

Issues with the water inlet valve can result in an excessive influx of water into the system, causing a rise in pressure beyond the normal range.

Potential risks and dangers of high boiler pressure

This issue is more than just a matter of inefficiency or inconvenience—there are genuine risks to consider. An over-pressurized unit carries the potential for serious issues.


As pressure mounts, the likelihood of developing leaks in your system increases. These can occur in pipe joins, valves, or even within the unit itself. Persistent leaks not only cause water damage but can also escalate to more severe problems.

Component failure

High levels put undue strain on various components. Pumps, pipes, and radiators are all susceptible to excess wear and could fail prematurely, necessitating costly repairs or replacements.

Dangers to household safety

If left unaddressed, your boiler could become a ticking time bomb in your household. The stress on the system may lead to a catastrophic failure, which could, in extreme cases, cause significant property damage and pose a danger to occupants. Regular monitoring and maintenance are essential to avoid creating a hazardous situation in your home.

It’s clear that allowing your boiler to operate at too high a pressure isn’t a risk worth taking. From the potential for inconvenient leaks to the possibility of a dangerous explosion, maintaining proper pressure is necessary for the safety and longevity of your boiler system.

Fixes for high boiler pressure

If you suspect that your boiler pressure is too high, here are some steps you can take to resolve the issue.

Bleeding radiators

Sometimes, air can become trapped within the radiators and cause this problem. By bleeding the radiators, you can release the excess air.

Adjusting the pressure relief valve

If the pressure relief valve is faulty or not functioning correctly, it may need to be adjusted or replaced. Consult a professional heating engineer to ensure this is done safely.

Replacing faulty components

Faulty pressure gauges, expansion vessels, or water inlet valves should be promptly replaced by qualified professionals to restore proper functioning.

Seeking professional assistance

In cases where the cause of this problem is not readily apparent, or the fixes mentioned above do not resolve the issue, it’s recommended to seek the assistance of a professional heating engineer. They’ll be able to diagnose the problem accurately and provide the necessary boiler repairs or replacements.

Prevention and maintenance tips

To prevent high boiler pressure and maintain a safe and efficient heating system, here are some preventative measures and maintenance tips to keep in mind:

  • Schedule regular unit inspections and servicing with a qualified technician to ensure optimal performance and identify any potential issues, especially if your boiler is older
  • Monitor pressure regularly using the pressure gauge and take action if you notice any significant fluctuations
  • Follow the manufacturer’s guidelines for maintenance and operation to keep your unit functioning at its best

Is boiler pressure causing you problems? Contact Plumb-Tech!

Addressing high boiler pressure is essential to maintain the safety, efficiency, and longevity of your heating system. By understanding the causes and implementing the appropriate fixes, you can ensure that your unit operates within its optimal range.

Remember to seek professional assistance when needed and prioritize regular maintenance to prevent future issues. By taking proactive measures, you can enjoy a reliable and energy-efficient heating system for years to come.

If you’re experiencing this issue or require relevant professional assistance, contact Plumb-Tech today. Our expert team is ready to help you resolve any boiler-related issues and ensure your heating system operates at its best.

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