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Airlocks in Central Heating Systems

Central heating systems play a pivotal role in maintaining a comfortable and cozy atmosphere within homes, especially during colder months. However, issues like airlocks can disrupt their smooth operation, leading to reduced efficiency and potential breakdowns. In this guide, we’ll delve into the phenomenon of airlocks in central heating systems, their causes, and solutions, with a focus on the expertise of EcoFix Plumbers, renowned for their reliable services, including boiler repairs and emergency plumbing in London.

What is an Airlock in a Central Heating System?

An airlock occurs when air becomes trapped within the central heating system’s pipes, preventing the flow of hot water. This trapped air disrupts the circulation of heated water, resulting in cold spots or even complete failure of radiators to heat up.

Causes of Airlocks:

Several factors can contribute to the formation of airlocks in central heating systems, including:

  1. Inadequate Bleeding: Improper bleeding of radiators during system maintenance or installation can leave pockets of air within the pipes.
  2. System Draining: When the central heating system is drained for repairs or maintenance, air can enter the system and become trapped during refilling.
  3. System Design: Poorly designed systems with high points where air can accumulate are more prone to developing airlocks.
  4. Water Pressure Issues: Fluctuations or drops in water pressure can create conditions favorable for airlock formation.

Effects of Airlocks:

Airlocks can lead to several issues within the central heating system, including:

  1. Reduced Heating Efficiency: Airlocks obstruct the flow of hot water, leading to decreased heating performance and potentially higher energy bills.
  2. Uneven Heating: Radiators affected by airlocks may only partially heat up or not heat up at all, causing discomfort in certain areas of the house.
  3. Boiler Strain: Airlocks can cause the boiler to work harder to compensate for the disrupted water flow, potentially leading to premature wear and tear.


EcoFix Plumbers to the Rescue When faced with airlock issues in your central heating system, it’s crucial to enlist the expertise of qualified professionals like EcoFix Plumbers. Specializing in eco-friendly solutions and emergency plumbing services in London, EcoFix Plumbers offer timely and efficient resolution to airlock problems.

Their approach typically involves:

  1. System Bleeding: EcoFix Plumbers meticulously bleed the radiators and central heating system to release trapped air, ensuring optimal water flow and heating efficiency.
  2. Pressure Adjustment: They check and adjust the water pressure within the system to prevent future airlock occurrences.
  3. System Flushing: In severe cases, where airlocks are persistent or accompanied by debris buildup, EcoFix Plumbers may recommend system flushing to clear out any obstructions.
  4. Professional Advice: EcoFix Plumbers provide homeowners with expert advice on central heating system maintenance practices to minimize the risk of airlocks and ensure long-term efficiency.


Airlocks in central heating systems can significantly disrupt household comfort and efficiency. However, with the assistance of experienced professionals like EcoFix Plumbers, homeowners can swiftly address airlock issues and restore their central heating systems to optimal functionality. By prioritizing regular maintenance and seeking prompt assistance for any plumbing emergencies, homeowners can ensure the uninterrupted operation of their central heating systems, even in the bustling city of London.

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