Monument vs Silverline Leak Detector
Choosing between a Monument and a Silverline leak detector can be tough. We compare their accuracy, build quality, and real-world reliability to help you pick the right tool for tracing water leaks.
Quick answer
The Monument 1125 Trace-A-Leak is the top pick for professional plumbers due to its superior sensitivity and robust build. For DIY users on a budget, the Silverline 633566 offers decent performance at a fraction of the cost, but with less accuracy and a shorter warranty.
Why trust ToolBuyerHub
- Compared like-for-like manufacturer specifications from each product before naming a winner
- Battery life & usability compared
- Aggregated owner reviews from major retailers
- Build quality & warranty checked
- Brand reliability in the plumbing tool market
- No fake hands-on claims
Research updated June 2026.
| Specification | Monument 1125 Trace-A-Leak | Silverline 633566 |
|---|---|---|
| Best For | Professional plumbers, complex systems | DIY users, simple pipe runs |
| Detection Method | Audio amplification (ground mic + sensor) | Audio amplification (sensor only) |
| Pipe Detection Range | Up to 1.5 metres depth | Up to 0.5 metres depth |
| Sensitivity Control | Variable, with noise filter | Fixed, no filter |
| Battery Type | 9V PP3 (included) | 9V PP3 (not included) |
| Build Material | Aluminium housing, rubberised grip | ABS plastic |
| Warranty | 2 years | 1 year |
| Weight | 680g | 400g |
| Average Owner Rating | 4.5 / 5 (from 120+ reviews) | 3.8 / 5 (from 50+ reviews) |
Monument 1125 Trace-A-Leak: The Professional Standard
The Monument 1125 Trace-A-Leak is widely regarded as the go-to leak detector for trade plumbers. It uses a combination of a ground microphone and a pipe sensor to amplify the sound of water escaping from pressurised pipes. Owner reviews consistently highlight its ability to pinpoint leaks through concrete floors and walls, saving hours of destructive investigation.
Its variable sensitivity control and built-in noise filter are key advantages. Users report that the filter effectively cuts out background hum from appliances or traffic, allowing them to focus on the distinct hiss of a leak. The aluminium housing and rubberised grip also give it a premium feel that stands up to daily job site use.
Silverline 633566: The Budget Contender
The Silverline 633566 is a basic audio-based leak detector aimed at homeowners and occasional users. It operates on the same principle as the Monument but with a simpler, fixed-sensitivity design. It is much lighter and cheaper, making it an accessible entry point for finding leaks in exposed or shallow pipes.
However, owner feedback points to several limitations. The lack of a noise filter means it picks up a lot of ambient sound, making it harder to use in noisy environments. The plastic build feels less durable, and the detection range is significantly shorter. Many users report success only with leaks in plastic pipes within 30cm of the surface.
Key Differences: Sensitivity and Build Quality
The most critical difference is detection depth. The Monument can reliably trace leaks up to 1.5 metres deep, while the Silverline struggles beyond 0.5 metres. For a leak under a concrete slab, the Monument is the only practical choice. The Monument also includes a ground microphone for floor scanning, a feature the Silverline lacks entirely.
Build quality is another major divider. The Monument's aluminium body and rubberised grip are designed for professional use, while the Silverline's ABS plastic feels hollow and less robust. The Monument also comes with a longer 2-year warranty, reflecting greater confidence in its durability.
What to Check Before Buying a Leak Detector
Detection depth: For leaks under concrete slabs or deep in walls, you need a unit with at least 1 metre of range. Budget models rarely deliver this.
Noise filtering: A variable sensitivity control and noise filter are essential for accurate tracing in occupied homes. Fixed-sensitivity units are easily confused by background noise.
Battery type: Most use a standard 9V battery. Check if one is included, as the Silverline does not come with a battery.
Build and warranty: A metal housing and a 2-year warranty indicate a tool built for regular use. Plastic units with a 1-year warranty are best for occasional DIY tasks.
Mistakes to Avoid When Using a Leak Detector
Relying on sound alone: Always cross-reference the audio signal with moisture readings or visual checks before cutting into a wall or floor. False positives are common with audio-only units.
Ignoring background noise: Turn off appliances, boilers, and running water to reduce interference. Without a noise filter, you may chase phantom leaks.
Not testing on a known leak: Before searching, test the detector on a known water pipe to confirm it is working and to familiarise yourself with the sound profile.
FAQs
Can the Silverline 633566 detect leaks through concrete?
It can detect leaks through thin concrete screeds up to about 50mm deep, but it is not reliable for thick concrete slabs. The Monument 1125 is much better suited for this task.
Does the Monument 1125 come with a battery?
Yes, the Monument 1125 Trace-A-Leak includes a 9V PP3 battery in the box. The Silverline 633566 does not include a battery.
Which leak detector is better for plastic pipes?
The Monument 1125 is better for plastic pipes because it has a higher sensitivity and a noise filter. The Silverline can work on plastic pipes but only if they are very close to the surface.
Is the Silverline 633566 suitable for professional use?
No, the Silverline is best for DIY use only. Its plastic build, fixed sensitivity, and limited range make it unsuitable for professional plumbing work.
How do I reduce false positives on a leak detector?
Turn off all appliances that use water or generate noise. Use the sensitivity control to dial in the signal and use the ground microphone to pinpoint the loudest point.
What is the warranty on the Monument 1125?
The Monument 1125 comes with a 2-year warranty against manufacturing defects. The Silverline 633566 has a 1-year warranty.
Can I use these detectors for gas leaks?
No, both the Monument and Silverline are designed specifically for tracing water leaks in pipes. They are not certified or safe for detecting gas leaks.
Which model is lighter and easier to carry?
The Silverline 633566 is lighter at 400g compared to the Monument's 680g. However, the Monument's weight is balanced by its more durable construction.
Do these detectors work on central heating pipes?
Yes, both can detect leaks in central heating pipes, but the Monument's superior sensitivity and filter make it much more effective at tracing leaks in underfloor heating systems.
Are replacement parts available for these units?
Monument offers better support for replacement parts and accessories. Silverline parts are harder to find, and the unit is often considered disposable.
Our verdict
For professionals and serious DIYers, the Monument 1125 Trace-A-Leak is the clear winner with superior depth, filtering, and build quality. The Silverline 633566 is a passable budget option for simple, shallow leaks, but its limitations make it a poor choice for any serious tracing work.