Central Heating Leak Detection

The experts we send to investigate hidden, or hard-to-find leaks in a central heating system are all Gas Safe registered. This means that as soon as a leak is found the repair work can begin straight away. They’re qualified to work on any part of a central heating system; boilers, radiators, heating pipes and underfloor water-fed systems.

Our tradespeople can be scheduled quickly for any type of water leak, or ingress, investigation throughout London and the Home Counties. We have experts on call 7 days a week.

In addition to leak investigation, we provide a full repair and refurbishment service. Once a leak has been pinpointed and exposed, the damage can be assessed and the repair process can begin immediately. We’ll provide all the information needed for an insurance claim too.

Customer reviews

  • Ben, the leak detection technician who attended my booking, provided excellent service and was very friendly and helpful. I would recommend Aspect to anyone!

    Duncan, Streatham, SW16

  • Very good service. Using specialist equipment found unexpected source of a persistent leak. Within a few days sent someone round to do the repairs. All contact with company pleasant and efficient.

    Mary, Greenwich, SE10

  • My wife discovered Aspect after a persistent leak began to damage four floor levels in our house. The leak detector Harry arrived on time with every conceivable type of equipment. He worked solidly for nearly four hours until he sourced the leak, which had defeated three British Gas Homeserve engineers, and then fixed it. I would recommend him and Aspect for any complex job. Worth every penny.

    Michael, Kennington, SE11

WATCH: Finding leaks in central heating systems

This video shows some of the non-invasive techniques used for finding leaks in central heating systems. It doesn’t show all of the detection methods we use.

Every investigation is different. Our tradespeople decide on the methods to use based on the evidence available to them and the results they get from each test.


Leaks In Central Heating Systems

Central heating boiler losing pressure

A pool of water beneath a radiator, or a boiler that’s losing pressure, are usually the first signs of a central heating system leak.

A water fed central heating system is sealed. It should maintain pressure if there are no issues. However, pressure within the system will increase and decrease slightly as it heats up and cools down again. If the pressure drops regularly and needs to be topped up with water, this is a clear sign of a problem.

If a boiler is losing pressure, a leak in the central heating system shouldn’t be assumed automatically. A Gas Safe registered engineer can first check for faults, such as a damaged expansion vessel, or pressure release valve. Both of these issues can result in the loss of pressure.

Checking for exposed water leaks

Simple checks for leaks in exposed parts of a central heating system are the first part of the investigation process. Tiny amounts of water may be escaping from pinhole leaks in radiator panels, corroded pipes or damaged valves and seals.

The “trace and access” investigation can begin as soon as the boiler and exposed parts of the central heating system have been checked.

No hidden extras

What you get from Aspect

  • Experienced & vetted tradespeople
  • 24 hour availability for all trades
  • Dedicated technical support team
  • Aspect Guarantee on workmanship
  • Peace of mind from trade accreditation

Occasional extra costs

  • Parts and materials used
  • Collection of parts and materials

We won’t charge you for

  • Cost of parking
  • Fuel or travel time
  • Congestion Charge
  • ULEZ charge

Non-invasive detection methods

The majority of tests we carry out are completely non-invasive. The location of a leak can usually be pinpointed to within a few centimetres without needing to expose central heating pipes.

Commonly, there are no visible signs of water damage when we investigate central heating leaks. This means two specific tests are vital to an investigation.

Thermal Imaging

Cameras are used to highlight where hot water pipes are located behind/under floors and walls. Temperature gradients between hot water pipes and the space around them are clearly visible.

Sometimes, if a leak is large enough, the hot water pooling beneath a leak will be revealed on the camera. Cool areas detected on the camera can also be an indication of a water leak.

Tracer Gas

The central heating system will need to be drained and filled with a harmless, odourless gas. A sensitive probe is used to detect the gas as it escapes from a leak in the system.The gas is lighter than air and is able to penetrate most floor coverings, including wood, tiles, laminate and carpet. It can even penetrate concrete floors. The detector alerts to where the gas is escaping.


Other tests can be used to provide evidence of where a leak is located. These include moisture content surveys and water analysis (testing for salts).

Some of our accreditations

We're fully trade accredited. Aspect is registered with Gas Safe and the National Association of Drainage Contractors (NADC). All our leak investigation experts are vetted and trade accredited. In addition, the Aspect Guarantee covers our tradespeople's workmanship for up to 12 months.

When you book and Aspect leak detection expert you can count on getting the professional expertise you're looking for.

Need more info on our leak investigation services? Someone from our team can call you.  Request a callback

Repairs and insurance claim reports

Exposing the leak to provide visual confirmation of where it’s located is a standard process. This also allows our expert to assess the extent of problem and see related water damage. Work to stop the leak and prevent further damage can almost always start immediately.

A detailed report of the investigation will be shared within 24 hours of attending. This can be submitted as part of an insurance claim.

A scope of work and fixed price quote can be produced for full reinstatement. We’ll return the damaged area to its original condition.

We’re always happy to help answer any questions your insurance provider might have. This could relate to any part of the investigation, repair or refurbishment work.

Account customers

We have a dedicated team of account handlers to support multi-site customers and commercial properties: Restaurants, Bars, Offices, Retail, Landlords, Letting Agencies, Hotels, Schools, Embassies, Care Homes and more

10% Off our hourly rates when you book online.

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