Central Heating Leak Detection in Hove

Symptoms

At a property in BN3, the customer had been experiencing a persistent and rapid loss of boiler pressure. The system required repressurising every 20 minutes, a cycle that had become a repeated disruption.

A previous plumber had attended and inspected the system but was unable to identify the source of the problem, leaving the fault unresolved.

On arrival, no visible signs of dampness were apparent anywhere in the property, making the leak difficult to locate by conventional visual inspection. The boiler pressure had been topped up around 30 minutes before the engineer arrived, yet it had already dropped to zero — confirming a significant and active loss from within the heating system.

This is a situation where central heating leak detection using specialist equipment is necessary. With no surface moisture to follow and a previous inspection having drawn a blank, the only reliable path to a diagnosis was a structured pressure and acoustic investigation.

Methods Used

The central heating leak detection process began with a system pressure assessment. The boiler had already lost all pressure by the time the engineer arrived, confirming the leak was active and significant.

Thermal imaging was considered but ruled out — the pipework was not sufficiently hot to produce usable readings, so the method was set aside in favour of alternatives.

The system was drained to remove residual water, and compressed air was introduced to clear any remaining moisture from the pipework. Tracer gas was then injected throughout the system.

Acoustic detection equipment was used to listen along the pipe routes, and a distinct sound was identified emanating from beneath the floorboards. This pointed to a precise location, which was then opened up with the customer's approval.

Investigation Process

1. 1
   Initial Assessment

   The engineer arrived and noted the boiler pressure had already fallen to zero, approximately 30 minutes after the customer had last topped it up. No visible dampness was found anywhere in the property.

2. 2
   Thermal Imaging Ruled Out

   Thermal imaging was considered but not used. The pipework was not sufficiently hot to provide reliable readings, so the engineer moved to alternative methods.

3. 3
   System Drained and Cleared

   The remaining water in the heating system was drained, and compressed air was introduced to remove any residual moisture from the pipework.

4. 4
   Tracer Gas Injection

   Tracer gas was injected into the cleared pipework throughout the heating system to create a detectable signal at any breach point.

5. 5
   Acoustic Detection

   Acoustic detection equipment was used along the pipe routes. A distinct sound indicative of escaping gas was identified coming from beneath the floorboards.

6. 6
   Floor Lifted and Leak Located

   With the customer's authorisation, the floorboards were carefully lifted at the identified location. A fractured push-fit isolation valve was found and confirmed as the source of the pressure loss.

7. 7
   Repair Carried Out

   The damaged section of pipework was removed and replaced, and a new isolation valve was fitted. Central heating inhibitor was added, and the system was repressurised and retested.

Result & Outcome

The leak was traced to a fractured push-fit isolation valve located beneath the floorboards. This was the component responsible for the repeated pressure loss — a fault that had remained undetected through a previous plumber's visit and was invisible from the surface, explaining why no dampness had been observed.

Repair was completed at the same visit. The damaged valve and the affected section of pipework were replaced, a new isolation valve was installed, and central heating inhibitor was added to the system. The system was then repressurised and retested to confirm the repair held and pressure was stable.

For the customer, this concludes what had become a disruptive and unresolved problem. Central heating leak detection using tracer gas and acoustic methods provided the precision needed to locate a fault that conventional inspection had missed entirely. The recommendation going forward is to keep up to date with the system and use the report as ongoing reference guidance.