Thermal leak detection uses an infrared camera to display surface-temperature differences. It can reveal patterns associated with hot pipes, evaporative cooling or wet materials, but the image must be interpreted carefully because many non-plumbing conditions affect temperature.
What a thermal camera actually sees
Infrared cameras measure emitted surface radiation and convert it into a temperature image. They do not see through walls and they do not directly photograph water inside a structure.
Hot-water pipe leaks
Escaping hot water may warm a floor, wall or ceiling. A spreading warm pattern can help trace the affected area, especially when the system has been operating long enough to create contrast.
Cold-water leaks and evaporative cooling
Moist surfaces can appear cooler as water evaporates. Temperature differences may also arise from drafts, air-conditioning, shading or insulation gaps, so moisture readings are usually needed as confirmation.
Best conditions for thermal testing
Clear contrast improves results. Technicians may control water use, wait for surfaces to stabilise and avoid testing immediately after strong sunlight or major temperature changes.
Common false positives
Electrical equipment, hot-water pipes without leaks, sunlight, missing insulation and air movement can all produce thermal patterns. A colourful image is evidence to investigate, not proof by itself.
Using thermal imaging with moisture meters
A thermal camera identifies unusual areas quickly, while a moisture meter helps determine whether those areas contain elevated moisture. Together they can narrow the likely source.
Slab and underfloor investigations
Thermal imaging can be useful where hot-water pipes run beneath floors. Concrete thickness, floor finishes and pipe depth influence what appears at the surface.
What thermal imaging cannot confirm
It may not distinguish plumbing water from roof ingress, condensation or waterproofing failure. It also cannot reliably locate every cold-water or underground leak.
From detection to repair
Once the evidence points to a likely area, pressure isolation and targeted access may be required. The goal is to minimise unnecessary opening while ensuring the actual defect is repaired.
Frequently asked questions
Can a thermal camera see water behind a wall?
No. It detects surface-temperature differences that may be caused by moisture or hot water.
Does thermal imaging work on cold-water leaks?
Sometimes, particularly where evaporation creates cooling, but the result is less direct than many hot-water leak patterns.
Is the coloured image enough for an insurance claim?
Usually not by itself. A written report explaining the findings, limitations and confirmed source is more useful.
Need a thermal leak assessment?
Send photographs of the affected surfaces and explain whether the water is hot, cold or intermittent so the correct testing method can be selected.