Pressure keeps dropping
The boiler loses pressure after being topped up and needs repeated attention.
Heating Leak Symptom
Boiler Losing Pressure
Repeated boiler pressure loss can indicate a hidden central heating or underfloor heating leak.
Pressure loss should be investigated before repeated topping up causes further damage or delays repair planning.
- Central Heating Leaks
- UFH Leak Detection
- Non-Destructive Methods
Causes
What Causes This Problem?
The underlying cause is not always visible. A structured investigation helps separate surface symptoms from the source of water escape.
Hidden central heating pipe leak
Underfloor heating circuit leak
Leaking manifold or connection
Pipework beneath floors or screed
Radiator valve or fitting fault
Pressure relief or expansion issue
Signs
Common Signs
Heating performance changes
Radiators or heating zones may become unreliable when system pressure falls.
Damp floor areas
Moisture or staining may appear away from the actual heating pipe leak.
UFH zones not heating
Underfloor heating loops may lose performance if a concealed leak is present.
Repeated top-ups
Regularly repressurising the system can point to an unresolved fault.
No visible leak
Heating leaks are often concealed below floors, inside walls or behind finishes.
Timing
When To Investigate
Pressure loss repeats
A one-off pressure change may be system-related, but repeated loss should be checked.
Damage is appearing
Damp, staining or flooring changes should be investigated before repairs are started.
Insurance evidence is needed
Written findings and photographs can support escape of water or trace and access claims.
Investigation
How Leak Detection Helps
Locates hidden pipework
Specialist methods help narrow the likely leak position before access work.
Reduces unnecessary damage
Investigation is carried out before floors or finishes are removed unnecessarily.
Supports repair planning
Clear findings help heating engineers target the correct area for repair.
Related Services
Recommended Leak Detection Services
FAQs
Boiler Losing Pressure FAQs
Why does my boiler keep losing pressure?
Repeated pressure loss can be caused by a hidden heating pipe leak, underfloor heating leak, faulty valve, expansion issue or pressure relief fault.
Can a hidden leak cause boiler pressure to drop?
Yes. A small leak in central heating pipework can cause ongoing pressure loss even when no water is visible.
Can you find heating leaks without lifting floors?
Non-destructive methods are used first, including thermal imaging, tracer gas and moisture mapping where suitable.
Is underfloor heating pressure loss different?
Underfloor heating leaks can be harder to see because pipework is concealed beneath flooring or screed, so specialist detection is often needed.
Can findings support an insurance claim?
Yes. Written findings and photographic evidence can be provided where insurer or loss assessor evidence is required.
Get Expert Help
Request A Heating Leak Investigation
Tell us what symptoms you are seeing, the property type and postcode. A specialist can advise the most practical next step.
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