If you see wet spots or cold zones in your floor, a underfloor heating leak is imminent. Loss of water pressure under tile, laminate, or PVC flooring, deep within the concrete screed.
At Ultrices Leak Detection, we quickly find underfloor heating leaks using thermography, acoustics, gas tracers, and pressure testing, without any disruptive work. We inspect the manifold, pump, control unit, circuits, synthetic pipes, and couplings.
If you want proof and advice, we provide a measurement report and repair plan, also for insurance purposes. Read Our Google reviews 5 out of 5 for underfloor heating leaks and plan today.
Table of contents
Underfloor heating leak: meaning and first signs
Underfloor heating leakage is a leak in the water-based underfloor heating system where water escapes from a pipe, coupling, or manifold beneath the floor. You often notice this through a loss of pressure in the central heating system, unexplained damp patches, or a floor that feels locally warm or cold. We see daily how a small underfloor heating leak can cause significant consequential damage to laminate, poured floors, anhydrite or cement screed, and even to the underlying structure. With targeted leak detection, we limit damage and help you quickly find the exact source without any demolition or breaking work.
- Typical signs: Recurring refilling of the central heating boiler, dropping water pressure, hissing noises, air in the circuit, localized heat spots on the floor and damp patches along skirting boards
- Indirect consequences: Bulging parquet or laminate, mold formation, loose tile grout, and higher energy bills due to heat loss
- Risk of consequential damage: Damage to insulation, corrosion of metal parts, and damage that your insurer *does* cover, provided you submit a proper expert report
How a leak in underfloor heating works and occurs
A water-based underfloor heating system consists of a manifold with a mixing valve and circulation pump, heating loops made of PEX, PE RT, or AluPEX with an oxygen barrier, and a heat source such as a high-efficiency boiler from Remeha, Vaillant, or Nefit Bosch, or a heat pump from Daikin. Water circulates through the loops at a low temperature and heats the screed. In the event of a leak in the underfloor heating, water escapes under pressure, causing a loss of pressure and allowing moisture to spread into the floor or insulation layer.
- Common Causes: Mechanical damage caused by drilling or screwing, manufacturing defect or aging of the pipe, leaking O-rings in the manifold, stress cracks on expansion joints, and errors during installation or renovation
- Structural factors: Cracking in anhydrite or cement screed, insufficient covering layers above the pipe, and movement in wooden subfloors
- Installation technology: Excessive system pressure, oxygen diffusion in the absence of a barrier layer, and galvanic corrosion in mixed metals
Our method for underfloor heating leak detection without heels
At Ultrices Leak Detection, we combine advanced techniques to pinpoint the location of underfloor heating leaks with pinpoint accuracy, entirely without any demolition or breaking work. We work with thermography according to the principles of EN ISO 6781 for detecting thermal anomalies, acoustic correlation and geophony, electrical pipe tracing, endoscopy, and pressure testing with tracer gas based on a 5 and 95 percent hydrogen-nitrogen mixture. Equipment from FLIR and Trotec, among others, provides high-resolution data, which we translate into a clear expert report that you can share with your insurer.
- Intake and print datesWe analyze your symptoms, recent refill frequency, and system pressure to determine the most likely circuit.
- Pressure test and segmentationWe pressurize loops per group and isolate the leak-prone segment according to a standardized protocol.
- Thermographic scanUsing an infrared camera, we visualize heat flows and cooling ingress around the leak source and capture heat patterns for the report and subsequent repairs; read more via thermographic inspection of underfloor heating
- Trace gas detectionWe fill the suspected circuit with forming gas and detect microscopic outflow with hydrogen sensors and geophon for accurate source determination.
- Report and advice: You will receive an expert report within three days with measured values, a photo and thermogram, repair advice, and conclusions eligible for insurance; schedule an inspection directly via underfloor heating leak detection
Leak detection process request
Types of underfloor heating systems and risk of leakage
Not every system carries the same risks. In wet systems, the pipes are embedded in the screed, while in dry construction, they are located in heat distribution plates or system plates. Manifold technology from Danfoss or Honeywell Home and pipe brands such as Uponor, Wavin, and Rehau have specific requirements for installation, couplings, and bend radii. Electric underfloor heating does not suffer from water leakage but is prone to cable breaks or insulation faults, which we make visible using thermography and voltage tracing.
- Wet systems: Pipes cut into or collapsed in anhydrite or cement, increased risk of point loading and drilling damage near doorframes and kitchen installations
- Drywall systems: Lightweight boards on wooden floors, sensitive to mechanical impact and movement around joints and expansion joints
- AluPEX and PEX variants: Good oxygen barrier but sensitive to incorrect kinks and overly tight bends during construction
- Distributors and fittings: Leakage at air vents, flow meters, O-rings, and mixing valves due to aging or dirt in the system
Practical examples and cost factors for underfloor heating leaks
A common example is a screw piercing a pipe when installing a partition wall during a renovation. We also see hairline cracks in bend zones due to insufficient pipe support, or a leaking coupling in the distribution cabinet that discharges into the floor via the pipework. With targeted measurements, we prevent unnecessary excavation of large floor areas and limit downtime.
- Cost influencers: Accessibility of the manifold and groups, floor finish such as cast floor or marble, surface to be inspected and the need to segment circuits
- Advantage of precision detection: Lower repair costs, shorter drying time due to limited exposure, and faster settlement with the insurer thanks to a complete report
- Recovery strategy: Mark exact location, make a small opening, replace pipe section with compression fitting or sleeve and pressure test until stable values
- Prevention: Measure and retain pipe routes, avoid deep boreholes along walking paths, and regularly vent and filter the system
Why Ultrices leak detection for underfloor heating leaks
You engage us because we operate nationwide, can be on-site within an hour in emergencies, and because we work with professional detection equipment and protocols that reliably demonstrate the cause. We are VCA VOL and NEN 3140 certified, work with insurers, and deliver a comprehensive expert report within three days. With over fifteen years of experience, a ninety-nine percent success rate, no-cure-no-pay, and a coverage guarantee, you choose certainty without risk. We assist both private individuals and businesses, entirely without disruptive demolition work and with a friendly approach that makes the difference. Read how we work damage-free via leak detection without heels, or call or WhatsApp us at 085 2505 217 and email info@Ultriceslekdetectie.nl for immediate advice. Do you want clarity and planning today, Receive a free quote for leak detection of your underfloor heating within 24 hours..
Frequently asked questions
How do I recognize a leak in my underfloor heating and what should I do immediately?
Typical signs include unexplained pressure loss in the central heating system requiring frequent topping up, cold zones in the floor per group, wet or dark spots in the screed or skirting boards, and sometimes a gurgling sound at the manifold. If the water meter stops running but the central heating pressure drops, a leak in the closed underfloor heating system is likely.
Immediately lower the thermostat, switch the pump or boiler to standby, and disconnect suspected circuits at the manifold to limit damage. Take photos of damp spots and call Ultrices Leak Detection. We are available day and night, on-site within an hour, work without demolition or breaking, with a 99 percent success rate and no cure, no pay. If you also have seepage into the bathroom, check out our emergency service. here.
Which method is the most reliable for finding a leak in underfloor heating without demolition work?
We combine thermal scans with a FLIR thermal imaging camera, electroacoustic listening techniques with highly sensitive microphones, and pressure tests. Where necessary, we use a tracer gas containing hydrogen and nitrogen that escapes through the smallest pores and can be precisely detected. For suspicious connections in the distribution panel, we perform endoscopy and locate pipe runs using a pipe locator.
This mix provides a fast and non-destructive diagnosis with a clear marking on your floor. Our VCA VOL and NEN 3140 qualified team delivers a complete expert report within three days, including photos, measurement data, cause, and repair advice. If you want to see how thermography works in wet rooms, take a look at our explanation for bathrooms. here.
How much does leak detection for underfloor heating cost, and is it covered by insurance?
The price depends on the floor area, the finish such as tiles or PVC, the accessibility of the manifold, and the number of circuits. We start with a no-obligation consultation and send a free, customized quote within 24 hours. In urgent cases, we take immediate action and charge transparently for both business and private clients.
We work nationwide with insurers and provide the expert report required for your claim. Consequential damage is often covered by buildings insurance; however, please check your policy. We offer a coverage guarantee, and you remain 100 percent risk-free thanks to our no-cure, no-pay promise. If you would like to know more about reporting to insurers regarding wet rooms, please read on. here.
How quickly can you locate a underfloor heating leak and how does the repair process work?
In case of emergency, we will be at your doorstep within an hour, day and night, nationwide. The inspection itself usually takes one to two hours, depending on the floor construction, such as sand cement, anhydrite, residential concrete, or tiled floor. In most cases, we locate the leak during the first visit and mark the exact spot.
After the diagnosis, you will immediately receive a repair plan with targeted demolition advice so that only a small opening is required above the leak. If desired, we will engage a partner installer for the final repair. Our five-out-of-five-star reviews and more than fifteen years of experience underscore the quality of our approach. If you would like insight into budgeting for related investigations, please view our bathroom pricing page. here.