What it contributes
Testing an appropriate isolated section can establish whether it holds pressure under the selected conditions. That can help separate a suspected circuit from the wider installation before tracing.
What it cannot establish alone
A pressure result does not give a repair location by itself. Valves, test boundaries and the condition of the installation matter.
The method is selected for the conditions at the property. More than one kind of observation may be needed, and the report should make clear which findings support the proposed next step.
Before the visit
Keep existing pipe drawings and earlier findings available. Describe any restrictions on isolation, access or normal system operation. You do not need to choose or prepare a specialist test yourself.
A related service
Get behind the pressure changes.
Central heating leak detection