Boiler pressure is too high - Find out why and how to reduce it

 

A boiler is an essential part of many homes, providing heat and hot water efficiently. However, if boiler pressure is too high, it can lead to system breakdowns, increased energy bills or even dangerous situations. Understanding the causes of high boiler pressure and how to reduce it can help you maintain a safe and efficient heating system.

Why is my boiler pressure too high?

Several factors can cause a boiler pressure to rise above normal levels. The ideal pressure for most domestic boilers is between 1 and 2 bar when the system is cold. Here are some common reasons why the pressure may be too high:

Overfilled system: If too much water has been added to the system during a refill, it can cause excessive pressure. This usually occurs when the fill circuit is left open or not closed properly.

Defective pressure relief valve: The pressure relief valve is designed to release excess pressure. If it is defective or blocked, it may not function properly, causing a continuous increase in pressure.

Problems with the expansion vessel: The expansion vessel of a boiler absorbs the additional pressure caused by the heated water. If it is faulty, lacking air pressure or clogged with water, it will not be able to regulate the pressure effectively.

Scale or sludge buildup: Over time, debris and scale can clog pipes and components, causing pressure fluctuations and inefficiencies in the system.

Leaks in the central heating system: Although leaks usually cause a drop in pressure, an inadvertent problem can sometimes create an imbalance, causing pressure spikes.

How to avoid high boiler pressure in the future

To avoid a recurrence of high pressure problems, follow these maintenance tips:

Regularly check the boiler pressure gauge to make sure it remains within safe limits.

Schedule an annual service by a qualified technician.

Bleed radiators when necessary to release trapped air and regulate pressure.

Avoid overfilling the system with water during refills.

By monitoring your boiler pressure and performing routine maintenance, you can ensure that your heating system remains efficient and safe. If you ever experience persistent high pressure, don't hesitate to seek professional help to avoid costly repairs or potential safety hazards.

Call Emergency Plumber in Preston. We are your right contact partner.