Boiler pressure loss
Controlled checks can help confirm whether a sealed heating circuit is losing pressure through hidden pipework.
Technology
Pressure Testing Leak Detection
Pressure testing helps confirm whether suitable pipework, heating circuits or water systems are losing pressure during a hidden leak investigation.
It is most useful when pressure loss points to a sealed system fault, but the visible signs do not yet show where the leak is located.
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Controlled Pressure Checks
Pipework or circuits can be tested under controlled conditions to assess pressure loss.
Heating & Water Systems
Useful for central heating, underfloor heating, mains water and concealed pipework investigations.
Evidence-Led Diagnosis
Pressure readings help confirm whether a system is losing pressure before access work is planned.
Used With Other Methods
Pressure testing is often combined with tracer gas, thermal imaging, acoustic detection or moisture mapping.
Investigation method
What Is Pressure Testing Leak Detection?
Pressure testing uses controlled test equipment to check whether suitable pipework or a sealed system is losing pressure. The method does not automatically show the exact leak position, but it helps confirm whether further leak detection is justified.
Engineers may isolate parts of a system, monitor pressure readings and use the results to choose the next method, such as tracer gas, acoustic detection, thermal imaging or moisture mapping.
Investigation principle
Confirm Pressure Loss
If pressure drops under controlled testing, the evidence can support a more targeted investigation into the affected circuit, pipe route or water supply.
Use cases
When Is Pressure Testing Used?
Central heating leaks
Heating circuits can be assessed where repeated top-ups, pressure drops or system faults suggest water loss.
Underfloor heating leaks
Underfloor heating loops and manifolds may require pressure testing before further leak detection methods are used.
Mains water leaks
Suitable water supply pipework can be tested to help confirm whether a hidden leak is present.
Leaks below concrete
Pressure testing can support investigations where pipework is concealed below screed, concrete or hard floors.
Trace and access investigations
Pressure readings can support written findings and help justify targeted access recommendations.
Advantages
How Pressure Testing Supports Leak Detection
Confirms pressure loss
Testing can help establish whether pipework is losing pressure before opening up finishes or floors.
Supports method selection
Results help engineers decide whether tracer gas, acoustic detection, thermal imaging or moisture mapping is appropriate.
Useful for sealed systems
Central heating circuits, underfloor heating loops and suitable supply pipework can be assessed systematically.
Helps target access work
Confirmed pressure loss helps avoid treating unrelated damp, heating or water symptoms as the primary cause.
Supports reporting
Pressure readings can form part of the evidence record for property owners, landlords or insurers.
Works alongside repairs
Pressure checks can support confirmation before and after targeted repair planning where conditions allow.
Method limits
Limitations Of Pressure Testing
Pressure testing is not suitable for every system. The pipework must usually be accessible enough to isolate, safe to test and appropriate for controlled pressure checks.
A pressure drop confirms that further investigation is needed, but it may not identify the precise leak location by itself. System condition, isolation points, pipework material and safe test pressure all affect how the method is used.
Real investigation examples
Pressure Testing In Practice
Pressure Testing Equipment
Controlled testing equipment can help confirm whether pipework is losing pressure.
Gauge Readings
Pressure readings help support evidence-led leak diagnosis before access work is considered.
Combined Investigation
Pressure testing is often used with tracer gas, thermal imaging or moisture mapping to narrow the source.
Related investigations
Pressure Testing Case Studies
Published investigations where pressure testing was used as part of the leak detection process.
Kingston, London
Mains Water Leak Detection in Kingston
Mains Water Leak
Rushing water heard when no services were in use was traced to a hole in a lead supply pipe and repaired in one visit.
View investigation
Coventry, West Midlands
Mains Water Leak Detection in Coventry
Mains Water Leak
A mains water pipe leak in Coventry caused significant property damage before being effectively addressed and repaired.
View investigation
Barnet, London
Bathtub Leak Investigation in Barnet
Failed Bathtub Silicone
Water through a ceiling in Barnet was traced to failed bathtub silicone after specialist bathroom leak investigation.
View investigationRelated problems
Symptoms That May Need Pressure Testing
Boiler Losing Pressure
Pressure loss in a boiler or heating system can indicate a concealed central heating leak.
Central Heating Losing Pressure
Repeated pressure drops may require controlled testing and leak detection investigation.
Underfloor Heating Losing Pressure
UFH loops and manifolds can be pressure tested before further location methods are selected.
Water Meter Constantly Running
A running water meter may require mains water investigation and controlled pipework testing.
Leak Under Concrete Floor
Pressure testing can support investigations where pipework is hidden below solid floors.
High Water Bill With No Visible Leak
Hidden supply pipe leaks may need pressure testing alongside other detection methods.
Related services
Services That Use Pressure Testing
01
Central Heating Leak Detection
Specialist investigation for sealed heating circuits, pressure loss and concealed pipework leaks.
02
Underfloor Heating Leak Detection
Investigation for UFH loops, manifolds and heating systems losing pressure below floors.
03
Mains Water Leak Detection
External supply pipe and mains water leak detection for high usage, running meters and pressure issues.
04
Trace & Access
Leak tracing reports and evidence for concealed pipework and insurance-led access decisions.
FAQs
Pressure Testing Leak Detection FAQs
What is pressure testing leak detection?
Pressure testing leak detection uses controlled pressure checks to assess whether suitable pipework, heating circuits or water systems are losing pressure.
Can pressure testing locate the exact leak?
Pressure testing can confirm pressure loss and help narrow the investigation, but the exact leak location often requires tracer gas, acoustic detection, thermal imaging or moisture mapping.
When is pressure testing useful?
It is useful where a boiler, heating circuit, underfloor heating loop, mains supply or sealed pipework system appears to be losing pressure.
Does pressure testing damage pipework?
Pressure testing should be carried out under controlled conditions by a specialist engineer. Suitability depends on the system, access, pipework condition and safe test pressure.
Is pressure testing used for insurance reports?
Where relevant, pressure readings can support written findings, photographs and trace and access evidence for property owners, landlords or insurers.
Request a survey
Request A Pressure Testing Leak Investigation
Speak to a specialist if your heating system, water supply or concealed pipework appears to be losing pressure.
