In the plumbing and heating trade, reputation is everything. One leaking joint, one failed fitting, one frustrated customer, and suddenly the job you finished weeks ago is back in your diary.
It’s a problem that’s currently in the spotlight, as recent figures from Citizens Advice revealed a 33% increase in complaints about plumbers and plumbing, rising from 2,175 in 2024, to 2,986 in 2025.
The most common faults? Leaks from incorrect pipe connections, poor-quality fittings and damaged property.
For professional installers trying to build a credible business based on reliability, the message is clear: the materials you choose matter.
This is one of the reasons multi-layer composite pipe (MLCP) press-fit systems have rapidly gained popularity across the UK. Combining the strength of metal with the flexibility of plastic, MLCP offers a compelling alternative to traditional copper systems.
But not all MLCP press-fit systems are created equal. Installers who have made the switch to the German-engineered alpex are reaping the rewards on the things they value most: competitive cost, straightforward installation and long-term reliability.
Copper pipe has dominated plumbing installations for decades, but the economics are changing. Multi-layer composite pipe typically costs around a third of the price of copper, making it an attractive option for installers working on larger projects or new builds where material costs quickly add up.
Just as important is price stability. Copper prices fluctuate heavily due to global metal markets, making it difficult for contractors to price jobs with confidence months in advance. MLCP, by contrast, is far more stable — helping installers quote accurately and stick to their quotes, whilst still protecting their margins.
At first glance, MLCP press fittings can appear more expensive than copper press fittings. But that comparison rarely reflects the reality of an installation. MLCP systems require far fewer fittings overall, thanks to the flexibility of the pipe and the ability to create sweeping bends rather than rigid directional changes.
In practice, many installers find that a typical MLCP installation can reduce fitting requirements dramatically, often bringing the total system cost to around half that of a comparable copper installation.
And while alpex may not always be the cheapest press-fit range on the market, experienced installers understand that when it comes to water pipe connections, quality matters far more than saving a few pounds on a fitting. A failed joint doesn’t just cost the price of a replacement component — it can mean damaged floors, upset clients and hours of unpaid call-back work.
Sometimes the cheapest fitting is the most expensive mistake.
Cost is important, but the real difference between systems often becomes clear on site.
One of the biggest advantages of press fit is its practical simplicity. Using a press gun removes the need for soldering, eliminating hot works and the associated fire risks. This not only improves site safety but can also reduce insurance requirements and removes the need to remain on-site during cooling periods after soldering.
MLCP also solves a surprisingly common problem on building sites: theft. Unlike copper, multi-layer composite pipe has no scrap value, making it far less attractive to opportunistic thieves.
Alpex goes further than other press-fit systems by adding practical features designed specifically for installers.
A large inspection window makes it easy to visually confirm that the pipe has been fully inserted into the fitting before pressing.
Its leak-before-press function also ensures that any joint accidentally left unpressed will show up immediately during pressure testing, rather than months later behind finished walls.
Flexibility is another key advantage. Modern butt-welded pipe construction allows alpex pipe to be bent to extremely tight radii – sometimes as tight as twice its outside diameter – significantly reducing the need for elbows and additional fittings.
Tool compatibility has also been considered. Alpex fittings between 16mm and 32mm can be crimped using both F and TH jaw profiles, allowing installers to use tools they already own, rather than investing in brand-specific equipment.
And while many plastic pipe systems have limitations in certain applications, alpex MLCP can also be used on secondary hot water return circuits, something many other well-known plastic systems cannot accommodate.
All of this adds up to one thing installers value above almost anything else: speed and confidence on the job.
While price and practicality may drive initial decisions, performance ultimately determines whether installers stick with a system long term.
MLCP pipe offers several advantages over copper when it comes to system efficiency. The inner surface of the pipe is extremely smooth, reducing the likelihood of incrustation or limescale build-up over time. This helps maintain flow rates, reduce maintenance requirements and improve pump efficiency.
At the same time, the aluminium core within the pipe provides 100% oxygen tightness. By preventing oxygen ingress into the heating system, MLCP significantly reduces the risk of sludge formation and internal corrosion – both major causes of system inefficiency and component failure.
Alpex fittings are also engineered with performance in mind. Their larger internal bore allows higher flow rates through the system, giving up to 30% better flow rates than many competing press fittings, and reducing pressure losses.
This becomes especially important in modern low-temperature heating systems, where maintaining flow rates is critical to overall performance – heat pumps in particular. Alpex’s patented ‘swept elbow’ design improves flow rates by up to 55% compared with traditional knuckle bends, helping systems operate more efficiently.
Durability is equally important. Alpex fittings are manufactured from high-quality dezincification-resistant (DZR) brass, ensuring long-term corrosion resistance. The brass used is also lead-free — a level of material quality not always found in lower-cost alternatives.
With operating parameters of 95°C at 10 bar, the system is perfectly suited as a direct replacement for copper in most plumbing and heating applications.
Ultimately, installers judge products on one simple metric – do they cause problems later?
Alpex systems are manufactured in Germany and backed by a €5 million insurance guarantee covering consequential damage caused by manufacturing defects — a level of reassurance that reflects the confidence behind the product.
For installers, that peace of mind matters. Because the best plumbing systems aren’t the ones you notice on the day of installation. They’re the ones you never have to think about again.
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