What is an airlock in a central heating and hot water system?
An airlock occurs when trapped air within a system collects into a single location, effectively cutting off a consistent water supply or flow of water to a specific area of your central heating loop or hot water supply pipes. Trapped air can manifest in a number of different ways:
- Poor or loss of heating performance from the radiators in general (airlock in the pump)
- Cold spots on an otherwise functioning radiator (trapped air in the radiator)
- Tapping or banging sounds from your heating system (trapped air in the system)
- Lower than normal boiler pressure (may occur after bleeding radiators)
- No hot water from taps (air lock in the hot water supply pipe work)
- Sputtering or inconsistent flow of water from taps (trapped air in the hot water supply pipe work)
Although there can be a number of reasons for loss of heating performance and we recommend reviewing all the possibilities, trapped air can be identified by the location of the performance loss. As air is lighter than water, it will typically rise to a high point within your system, such as at the top of radiators.