Plumbing & Heating, Swimming Pool and Water Mains Specialist · Based in Bushey, Hertfordshire
Danny O'Mahony is a leak detection engineer specialising in identifying hidden water leaks using thermal imaging, acoustic listening equipment, and tracer gas.
CIPHE accredited
WIAPS member
Danny is part of ADI Leak Detection — the UK's leading leak detection specialist with 1,250+ five-star Trustpilot reviews, full CIPHE and WIAPS accreditation, and £5 million public liability insurance.
Danny O'Mahony has 40 years in plumbing and heating engineering, including specialist experience as a boiler technician and on new build installations, backed by 5 years focused on leak detection. He holds City & Guilds qualifications in both Plumbing Craft and Advanced Plumbing Craft, and is a qualified PADI Rescue Diver, making him one of the few engineers equipped to investigate swimming pool leaks at depth. His particular strengths are central heating systems, swimming pools, and water mains.
Recent leak investigations carried out by Danny O'Mahony across central heating, swimming pool, water mains and underfloor heating leak detection.
The owner of a property in CT10 reported that the swimming pool was losing up to 20cm of water per day, a rate significant enough to prompt an investigation into the pool's pipework, liner, and associated equipment. Three leaks found: skimmer pipe under filtration shed slab, two liner tears.
With no external signs of a leak and the system still losing pressure, central heating leak detection was required to establish whether a second leak point existed elsewhere in the property. Leak found on pulled bend beneath hallway floor, pipe replaced.
Real Trustpilot feedback from customers Danny has attended.
Danny has been working in the plumbing sector since 1986, starting out on new build installations before moving into boiler and heating specialism and eventually into leak detection. That background means he understands how systems are built from the ground up, which shapes how he reads a problem when a leak isn't immediately obvious. He covers a wide stretch of England, from Bedfordshire and Hertfordshire down through Greater London and into Kent, Surrey, and the south coast counties. Whether the job is a domestic central heating system or a buried mains supply, he works through what the evidence is telling him before anything gets opened up.
Danny specialises in central heating leak detection, swimming pool leak detection, water mains leak detection, and underfloor heating leak detection, alongside bathroom leaks, drain leak investigation, and underground pipe leaks. His background as a boiler specialist gives him particular depth on heating system faults, and his PADI diving credentials make him one of relatively few engineers who can carry out in-water pool inspections.
Danny uses thermal imaging cameras to identify heat or moisture variation behind surfaces, helping to locate leaks without opening up walls or floors unnecessarily. Acoustic listening equipment is used to track sound signatures through floors and ground, which is especially useful on underground and buried pipe jobs. Tracer gas and moisture meters are brought in where those methods need further confirmation, giving a fuller picture before any repair work is scoped.
Danny has 40 years in plumbing and heating engineering and 5 years in leak detection, having entered the sector in 1986 working on new builds before specialising in boilers and later moving into leak investigation. He holds City & Guilds qualifications in Plumbing Craft and Advanced Plumbing Craft. His PADI qualifications, including Rescue Diver and Dry Suit certifications, are particularly relevant to his swimming pool leak detection work.
Danny works on domestic homes, including houses and flats with central heating, underfloor heating, or older pipework that can be difficult to trace. He also works on properties with swimming pools and on jobs involving underground supply pipes where the leak is outside the building. His experience across new build and existing housing stock means he can read a wide range of plumbing configurations without needing to make assumptions about how a system is laid out.
If your water bill has risen without explanation, you can hear running water when no taps are on, or you have damp patches appearing on floors, walls, or ceilings that your plumber hasn't been able to trace, a specialist investigation is the right next step. The same applies if you have a swimming pool losing water or a heating system that keeps losing pressure. Call ADI Leak Detection on 0800 731 3843 to book an investigation — ADI will aim to assign Danny where he is available in your area.
Danny follows a consistent five-stage process on every visit. The approach is non-invasive and designed to isolate the fault before any disruption to your property.
Danny investigates leaks across central heating systems, underfloor heating, water mains, bathroom plumbing, drains, and underground pipework.
He also carries out swimming pool leak detection, an area that draws on his PADI diving qualifications for underwater inspection.
Drain leak investigation and leak correlation are also within his scope, covering a broad range of domestic and commercial leak scenarios.
Danny works across a large area of England, covering counties including Bedfordshire, Hertfordshire, Greater London, Surrey, Kent, Hampshire, and West Sussex, as well as Oxfordshire, Buckinghamshire, Berkshire, and further into Cambridgeshire, Essex, Suffolk, Warwickshire, and Wiltshire.
Danny works on residential properties of all types, from standard domestic homes through to more complex builds where heating or water systems have been extended or altered over time.
His 40 years in plumbing and heating engineering means he is well placed to handle both straightforward internal leaks and more demanding jobs such as buried mains pipe failures that require careful investigation before any ground is broken.
Swimming pools are a distinct area of his work, requiring a different set of skills and equipment to those used on building-based leaks.
Danny carries out leak detection surveys across Greater London, South East, East Anglia, South West & The Midlands. His work includes domestic and commercial investigations involving central heating, swimming pool, water mains, underfloor heating, and bathroom leaks.
ADI Leak Detection aims to provide next-day availability across the UK — call today for a quote.
