Tackle underfloor heating leak pressure tests smartly with Ultrices leak detection. We perform an underfloor heating leak pressure test on your pipes and manifold, so you prevent malfunctions and water damage.
Using a manometer, we measure pressure loss per group and check the central heating circuit. We detect leaks using nitrogen and tracer gas, thermography, acoustic measurement, and moisture measurement.
You receive a clear report with repair advice, often without unnecessary cutting and breaking. Read how customers rate our pressure test in our underfloor heating pressure test reviews, Google reviews 5 out of 5.
Table of contents
What is a pressure test for underfloor heating leakage?
A pressure test for underfloor heating leaks is a controlled pressure test performed on the pipes beneath your floor to confirm and locate pressure loss and micro-leaks. We subject a circuit or all groups of the manifold to a stable test pressure and monitor the pressure drop curve using an accurate manometer. The underlying technique relies on principles of fluid dynamics and Pascal's law, meaning any pressure deviation directly indicates a leak path. At Ultrices Leak Detection, we combine the pressure test with thermography, acoustic measurement, and tracer gas so that you receive clarity quickly without any disruptive demolition work. We work in accordance with EN 1264 for underfloor heating systems and apply practical guidelines from ISSO publications for water-based low-temperature heat distribution systems.
How does the pressure test work and when do you choose water, air, or tracer gas?
The choice of medium and method depends on the floor construction, finish, water damage risk, and the condition of the installation. A hydraulic pressure test with water is suitable for new or moisture-resistant situations. For occupied and vulnerable floors, we often opt for a pneumatic pressure test using dry nitrogen or nitrogen-hydrogen tracer gas. Tracer gas containing ninety-five percent nitrogen and five percent hydrogen is lighter than air and seeks the smallest leak path, which we then detect with a sensitive gas detection system. In combination with an infrared camera, such as FLIR, and a geophon microphone, we map the exact location down to the tile level, allowing for targeted repairs.
Our protocol for a reliable print proof without demolition
- Preliminary inspection We check the manifold, shut-off valves, flow meters, air vents, pump, and couplings from brands such as Uponor, Wavin, Viega, Rehau, Danfoss, and Honeywell, and determine which groups are tested separately.
- Disconnect and seal We isolate the underfloor heating from the central heating boiler and seal the circuits with professional shut-off couplings to prevent false readings.
- Pushing up and stabilizing Using a calibrated pressure pump, we bring the system to the correct test pressure in bar and allow it to stabilize while monitoring environmental factors.
- Measurement phase We log the pressure drop over time, perform an acoustic leak measurement, and, if necessary, apply tracer gas to selected groups for pinpoint detection.
- Verification Using thermography and moisture measurements, we confirm the leak pattern and rule out alternative causes such as capillary rise or condensation.
- Completion and advice We safely depressurize, restore the initial situation, and provide immediate repair advice, including the impact on the finished floor and tiles.
Leak detection process request
Measuring equipment and techniques that make the difference
- Manometer and data logger High-resolution measurement of pressure drop per second for a reliable diagnosis of micro-leaks and temperature fluctuations.
- Tracer gas detection Hydrogen-sensitive sensors find the smallest leak path in PE RT and PEX pipes with an EVOH oxygen barrier, even under leveling compound or anhydrite.
- Thermographic scan Infrared image of the heat distribution reveals cold zones, bypass flow, and hidden pipe routes without opening up your floor. Read more via thermographic floor scan.
- Acoustic correlation An advanced geophon and correlator listen for flow noise and cavitation around couplings, bends, and the distribution box.
Causes and signs of pressure loss in underfloor heating
- Mechanical damage Drilling or screwing through a pipe when installing skirting boards or furniture is common in the screed near walls and doorways.
- Fittings and couplings Outdated or incorrectly crimped couplings at the manifold, flow meters, or air vents of the pump unit cause micro-leaks.
- Material aging Thermal and mechanical stress can cause hairline cracks in PEX or PE RT, especially with insufficient bending radii or point loads.
- Corrosion and oxygen ingress In the event of a damaged EVOH barrier or open system, air can enter, triggering corrosion on metal parts in the manifold.
- Practical symptoms Dropping pressure gauge on the manifold, air in the groups, cold zones, damp spots, or a central heating boiler that needs pressure topping up.
- Increased consumption Heat loss due to a bypass or leak causes your heating costs to rise and your heat pump or boiler to run unnecessarily long.
- Odor and mold Persistent moisture under PVC or laminate causes a musty odor and edge discoloration that you want to stop quickly.
- Water meter keeps running With connected systems, you see unexplained flow on the water meter or moisture in the meter cupboard.
If you want to have the leak found without any demolition work, choose our targeted approach with tracer gas and IR. View our approach via underfloor heating leak detection without demolition and schedule an inspection with our team immediately.
Report, insurance and recovery advice
We deliver a comprehensive expert report within three days, including pressure curves, thermographic images, measurements, and a repair plan including an estimate of consequential damage. We operate nationwide, are VCA VOL and NEN 3140 certified, have fifteen years of experience, and a ninety-nine percent success rate. Collaboration with insurers is arranged, including a guarantee of coverage when the policy covers leak detection. No solution, no payment, and completely risk-free. In emergencies, we are on-site within an hour with professional detection equipment, day and night. Call or WhatsApp 085 2505 217 or email info@Ultriceslekdetectie.nl. If you want to take immediate action, you can also purchase our service in the same move. underfloor heating leak detection view for more technical details and practical examples.
Practical example and what you get from us
In a home with PVC flooring and a Danfoss manifold, we observed a persistent pressure drop. Hydraulic testing was too risky due to the fragile finish. We selected tracer gas, detected gas leakage at a bend near the kitchen, and confirmed the location with a thermographic hotspot and acoustic signal. The tiler only had to lift one tile, after which a press fitting was replaced and the system was declared leak-tight again with a repeated pressure test in the presence of the resident.
- What you receive Clear diagnosis, measurement report with photo and IR image, recovery advice per location, and guidance towards the insurance company with the possibility of full reimbursement.
- Why Ultrices leak detection 24/7 service, no cure no pay, no disruptive work, five out of five stars in Google reviews, and a team that helps both private and business clients.
- Next step Request a no-obligation price indication and schedule your inspection at your convenience to prevent further consequential damage.
- Cost insight Transparent rates with a possible bundle discount if additional inspections, such as for the facade or roof, prove necessary.
If you want quick clarity and a quote tailored to your situation, make use of our Free underfloor heating leak detection quote within 24 hours.
Frequently asked questions
What is a underfloor heating leak pressure test and how does it work?
During a pressure test, we pressurize your underfloor heating circuits using controlled overpressure with dry nitrogen or water and monitor the measurements with a certified manometer and data logger. We isolate each group at the manifold, stabilize the temperature, and read the pressure curve. This allows you to immediately see if there is pressure loss due to a micro-leak or a leaking coupling, entirely without any demolition or breaking work.
Where necessary, we combine this with FLIR thermography, ultrasonic leak detection, tracer gas, and endoscopy at the distributor. With 15 years of experience, VCA VOL and NEN 3140 certification, 24/7 service, and nationwide coverage, we can be at your doorstep quickly. If you would like to see how we use thermal imaging in wet areas, take a look. our thermography page for bathroom leaks.
What pressure and test duration do you use for a pressure test of underfloor heating?
Depending on the system and manufacturer, we typically test with dry nitrogen between 3 and 6 bar or one and a half times the operating pressure. We apply a stabilization period to filter out the influence of temperature and then monitor for at least 60 minutes using data logging. A stable line or a pressure drop of at most 0,1 to 0,2 bar after compensation indicates a tight system; a declining line indicates a leak.
Upon completion or renovation, we often log data for up to 24 hours for extra assurance, in accordance with guidelines from EN 1264 and ISSO 49. PEX, PERT, and PB pipes can safely withstand this test, provided they are tested according to specifications. We document everything with photos and a measurement report, immediately available for your insurer and our Coverage Guarantee.
What signs indicate a leak in underfloor heating and what to do first
Noticing that your central heating pressure keeps dropping, having to top up frequently, cold streaks in the floor, damp spots, or a musty smell are red flags. If you hear gurgling in the pipes or see the pressure fluctuating at the manifold, a pressure test is the quickest way to be certain and limit damage.
Shut off the circuits you suspect, note the pressure, and contact us immediately. We arrive on-site within 1 hour, 24/7, work non-destructively, and find the cause in 99 percent of cases. Are you also experiencing water around the shower? Read how we provide lightning-fast assistance via our emergency page for bathroom leak detection.
How much does a underfloor heating pressure test cost and is this covered by your insurance?
The costs depend on the number of groups, the accessibility of the manifold, the type of floor finish, and whether additional techniques such as tracer gas or thermography are required. You will receive a free quote within 24 hours. No solution, no payment with our no cure no pay promise for both private and business clients.
We work with insurers and deliver a Comprehensive Expertise Report with a measurement report and photos within 3 days. This allows you to claim quickly and smoothly, including our Coverage Guarantee. If you would like to see what an insurance report looks like, view our example of a leak detection report for insurance.