Hot Water System Leak Detection in Norwich

Symptoms

The internal stopcock, located in the bathroom behind the toilet, was found to be non-functional, leaving no straightforward way to isolate the supply internally. The water meter was situated in the public footpath area.

With damage spread across the bedroom and bathroom zone, a structured hot water leak detection approach was needed to determine which part of the system was responsible and to pinpoint the exact leak location before any floor was broken.

Methods Used

To narrow down which circuit was responsible, the cold feed at the boiler was isolated and pressure testing was repeated on the external mains and cold feed alone — that test passed. Pressure testing on the hot feed pipework in isolation then failed, confirming the leak was on the hot side.

This is a standard progression in hot water leak detection: eliminate circuits systematically until the fault is isolated to one. With the hot feed confirmed as the source, tracer gas was introduced and the detector identified a likely leak location in the bedroom area.

Acoustic equipment was then used to refine the position as precisely as possible before any concrete was lifted.

Investigation Process

1. 1
   Visual Inspection on Arrival

   The engineer inspected the property and noted massive water damage to the corridor and bedroom walls, a saturated concrete subfloor where carpet had been lifted, a non-functional internal stopcock behind the toilet, and the boiler location in the kitchen.

2. 2
   Damp Meter Survey

   A damp meter investigation was carried out across the bedroom and bathroom area. High readings were recorded in almost every location surveyed, indicating widespread water spread beneath the floor.

3. 3
   Thermal Imaging of Pipe Runs

   Hot water was kept running and a thermal imaging camera was used to identify the pipe runs through the floor, establishing the layout before pressure testing began.

4. 4
   Full System Pressure Test

   Pressure testing was carried out on the hot, cold, and external mains pipework together. The test failed, confirming a leak was present somewhere in the system.

5. 5
   Cold Feed Isolated at Boiler

   The cold feed pipework was turned off at the boiler to allow the external mains and cold feed to be tested separately from the hot feed.

6. 6
   External Mains and Cold Feed Pressure Test

   Pressure testing on the external mains and cold feed pipework in isolation passed, ruling out both circuits as the source of the leak.

7. 7
   Hot Feed Pressure Test

   Pressure testing on the hot feed pipework alone failed, confirming the leak was located on the hot feed circuit.

8. 8
   Tracer Gas Investigation

   Tracer gas was introduced into the hot feed pipework. The detector identified a possible leak location in the bedroom area.

9. 9
   Acoustic Pinpointing

   Acoustic equipment was used to refine the leak position within the bedroom floor as precisely as possible before any concrete was lifted.

10. 10
    Customer Informed

    The customer was informed of the findings and the potential solutions before any floor was exposed.

11. 11
    Concrete Exposed and Leak Found

    The concrete floor was opened at the identified location. One leak was found on the 3/4" copper pipework in the bedroom area.

12. 12
    Repair Carried Out

    The leaking section of pipework was cut out and replaced using new copper pipework and soldering fittings, with insulation applied to the repaired section.

13. 13
    Retest and Reinstatement

    A pressure test was carried out on the hot feed pipework only; the test passed, confirming no further leaks. Water pressure was restored to working order throughout the property.

Result & Outcome

The dehumidifier already on site should be kept running to assist with drying out the concrete and surrounding structure following the prolonged water ingress. With the leak repaired and the system retested, the property in NR13 is back to normal operation.