• Same-day service available
  • Gas Safe registered experts
  • Insurance claim support
  • Half hour rates from £49.50 + VAT

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We understand the stress of continual boiler pressure loss. A qualified heating engineer should be able to diagnose an associated boiler fault quickly. However, if the checks are negative, a leak is the likely cause.

Our Gas Safe-registered experts can resolve pressure loss problems on any central heating system. They’re equipped with non-invasive leak detection methods. If they can’t find a fault on the boiler or a leak on exposed parts of a central heating system, an investigation can be carried out to pinpoint the location of a leak in concealed pipes.

Pressure loss investigation process

Most central heating systems are sealed. They should generally maintain pressure if there are no issues. A boiler might need topping up once a year; if it becomes a regular requirement, you can assume there is a problem that needs fixing.

If a boiler is continually losing pressure, a leak isn’t assumed automatically. Our experts investigate boiler pressure loss problems in the following order:

Boiler fault checks

Our Gas Safe-registered experts will first inspect the boiler for faults that could result in a loss of pressure, such as a damaged expansion vessel or pressure relief valve.

Radiator checks

Checks are performed on the exposed parts of the system. Water may be escaping from pinhole leaks in radiator panels, corroded pipes or damaged valves and seals.

Concealed leak detection

If visual checks fail to reveal a leak, a “trace and access” investigation using reliable, non-invasive methods, is conducted to locate leaks on concealed parts of the system.

Leaks in Central Heating Systems

WATCH: How we investigate boiler pressure loss

This video demonstrates how non-invasive methods are used to detect a hidden leak in a central heating system, following checks for boiler faults.

Several techniques are usually used during a thorough investigation.

Once found, our experts can access the leaks for repairs.

Recent customer reviews

  • What a relief! Boiler pressure started dropping overnight, then twice a day. I gave up after looking everywhere for a leak, and having the boiler checked by the manufacturer.
    Ricky from Aspect was great. Kept us updated, and explained the procedure every step of the way. Finally found a leak using gas detection, in a pipe embedded in the concrete floor! Fixed it quickly. Now all good.

    Laurence, Upminster, RM14

  • We had a very good experience with Aspect. Our boiler was losing pressure. They had an expert out the next morning who arrived at 8am. By 4.30pm they had located a leak under the floor, fixed it and the room was tidy and warm. It was complicated needing gas run through the system. I had a query after and the technician was really helpful.

    Jennifer, Holland Park, W11

  • What a relief! Boiler pressure started dropping overnight, then twice a day. I gave up after looking everywhere for a leak, and having the boiler checked by the manufacturer. Ricky the engineer was great. Kept us updated, and explained the procedure every step of the way. Finally found a leak using gas detection, in a pipe embedded in the concrete floor! Fixed it quickly. Now all good.

    Laurence, Tunbridge Wells, TN2

  • Excellent service very responsive and professional tradesman. Kevin attended my property to find a leak in my central heating system he was very kind, professional and reassuring. His team were also very good. I would highly recommend.

    Mrs Williams, Bexleyheath, DA7

  • Anton was exceptional. Despite being tricky to trace, he persevered and found the leak on the c.h. system eventually. He repaired the leak and reinstated the substrate. Every step of the way he was communicating very clearly about what he was doing and how far along the process he was. He was courteous, efficient, diligent, and effectively solved a problem we'd had for about 2 months. The boiler no longer looses pressure and finally we can at last relax about it.

    Patricia, Banbury, OX17

  • Glenn was an amazing guy, helped me understand the issue with my boiler pressure and made sure everything is alright, he was transparent about all the costs. Definitely recommend getting him to sort any plumbing issues.

    Catalin, Streatham, SW16

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Trade-accredited experts

Our central heating leak detection experts have years of experience in both domestic and commercial properties and are Gas Safe registered. They can safely work on plumbing and heating systems. Their years of knowledge and experience add to their ability to detect leaks. We are fully trade accredited and members of WaterSafe.

When a central heating leak is exposed, further water damage can be prevented immediately. They are skilled at repairing leaks and checking the central heating system for other issues. For your peace of mind, their workmanship comes with our 12-month guarantee.

Boiler pressure loss pricing

Half-Hourly Rates

Our boiler pressure loss investigation and repairs are charged in half-hourly increments (1-hour minimum).

Boiler tests and checks for leaks on exposed parts of a central heating system are charged at our Heating & Hot Water rates:
– From £49.50 + VAT on weekdays
– From £65.25 + VAT on evenings and weekends
– From £85.50 + VAT for late nights (9pm to 7am)

Our Leak Detection rates will apply for trace and access investigation time needed to find a leak on the concealed parts of the system:
– From £49.50 + VAT on weekdays
– From £65.25 + VAT at evenings and weekends
– From £85.50 + VAT for late nights (9pm to 7am)

Use our postcode checker to get our best rates for your area.

If needed, a tracer gas charge will be added to the leak detection time. There is no extra charge for an emergency attendance, when we aim to be on-site within 1 hour.

Fixed Price Reinstatement

Reinstatement work, which is needed to return walls, floors, or ceilings to their original condition, can be estimated at a fixed price.

Commercial gas supplies

We have Gas Safe-registered experts who can work on domestic and non-domestic gas supplies.

Our account team is ready to help customers across a wide range of commercial sectors, including: Food & Beverage, Hotels, Education, Healthcare, Property Management, Offices, Religious Buildings, Retail, Leisure & Entertainment, Sport & Fitness, Foreign Government, and more.

An Aspect commercial gas engineer checking boiler operation in a plant room.
Book a commercial gas engineer

Non-invasive leak detection methods

A thermal image camera shows hot water pipes.

If a hidden leak is thought to be the cause of boiler pressure loss, our expert can pinpoint its position using non-destructive methods. Most insurance companies require the process we follow when dealing with an “escape of water” or “trace and access” claim.

  • Thermal imaging
  • Tracer gas
  • Acoustic surveys
  • Moisture meters
  • Borescope cameras
  • Salts analysis
  • Pressure tests
  • Tracer dyes

Related trade services

Emergency boiler repair

Gas Safe registered heating engineers on call 24 hours a day, 7 days a week

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Central heating leaks

Leaks can be found in the concealed parts of a system using tracer gas

Find out more

Underfloor leaks

Leaks in pipework can be detected beneath wood, tile, and laminate floors

Find out more

Heating engineers

Local experts for boiler repairs and servicing, gas safety checks and installs

Find out more
An Aspect van on its way to an out of hours emergency attendance.

Why choose Aspect?

  • Large team of Gas Safe experts
  • Clear pricing; no hidden extras
  • Thorough investigation process
  • Workmanship guarantee
  • Same-day service available
  • Emergency response 24/7
  • Knowledge & advice you can trust
  • 5-star customer service

Insurance claim advice

If you suspect a leak in your central heating or plumbing system, you shouldn’t ignore it. Fixing the problem can usually be covered on an insurance policy.

Water escaping inside a property could be causing bigger problems than any visible signs might suggest. Similarly, continually topping up a central heating system with water to repressurise it is not fixing the cause of the problem.

Water damage can eventually compromise the structural integrity of a property if left unresolved. Failing to act quickly might mean your insurance company rejects your claim.

You can find out more about making a successful insurance claim in our guide.