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Why Does My Boiler Keep Losing Pressure? Common Causes And Solutions

Why does my boiler keep losing pressure? Common causes and solutions

Your home’s boiler is a vital part of your heating system, ensuring you have a warm and comfortable living environment, especially during colder months. However, if you’ve noticed that your boiler keeps losing pressure, it’s essential to address the issue promptly to prevent further problems and maintain efficient heating. In this blog, we’ll explore the common reasons behind boiler pressure loss and offer solutions to help you keep your heating system running smoothly.

Why is boiler pressure important?

Boiler pressure refers to the balance of water and air within your heating system. Maintaining the correct pressure level is crucial for efficient operation. If the pressure drops too low, your boiler may not function correctly, potentially causing it to shut down, reducing heat output, or even damaging the system. Therefore, understanding the causes of pressure loss is essential.

Common causes of boiler pressure loss:

1. Leaking radiators or pipework:

One of the most common reasons for pressure loss is a leak in the radiator or pipework. Over time, rust or wear and tear can cause small leaks. These leaks allow water to escape, leading to a drop in pressure.

Solution: Inspect your radiators and pipework for visible signs of leakage, such as damp spots or puddles. If you find any, it’s essential to repair or replace the affected components.

2. Bleeding radiators:

Bleeding radiators is a routine maintenance task to release trapped air and improve heating efficiency. However, if not done correctly, it can lead to pressure loss.

Solution: When bleeding radiators, ensure you close the bleed valve tightly once the air is released. Monitor the pressure gauge on your boiler and repressurize the system if necessary.

3. Faulty pressure relief valve:

The pressure relief valve is designed to release excess pressure from the boiler to prevent damage. If this valve is faulty or improperly set, it may release water, causing a pressure drop.

Solution: Consult a qualified technician to inspect and, if needed, replace the pressure relief valve.

4. Water leak in the boiler:

A leak within the boiler itself is a more serious issue. It can cause significant pressure loss and damage to the boiler’s internal components.

Solution: Contact a professional boiler engineer to diagnose and repair the internal leak. In some cases, the boiler may need replacement.

5. Inadequate filling of the system:

If the heating system was not filled correctly after installation or maintenance, it may not have the proper water volume, leading to low pressure.

Solution: Consult the boiler’s user manual or hire a professional to correctly fill and pressurize the heating system.

6. Corroded expansion vessel:

The expansion vessel absorbs excess water as it expands when heated. Over time, corrosion can occur, reducing the vessel’s effectiveness.

Solution: A corroded expansion vessel may need replacement by a qualified technician to ensure proper operation.

Note: If you are planning to replace your boiler system, The UK government is providing boiler heating grants and boiler upgrade scheme  to help you finance the purchase. Contact Warma UK for more information. 

M‌a‌intaining the correct pressure in your boiler is essential for its efficient and safe operation. If you find that your boiler keeps losing pressure, it’s crucial to investigate the root causes promptly and take the necessary steps to address them. Regular maintenance, professional inspections, and timely repairs can help you keep your heating system running smoothly, ensuring a warm and comfortable home, even during the coldest days of the year.

Athira Harish