Absolutely, yes! PERT-AL-PERT (Polyethylene of Raised Temperature
resistance - Aluminium - Polyethylene of Raised Temperature resistance) pipe is
not only suitable but increasingly popular for potable (drinking) water
installations within the UK. However, like all materials in contact with
drinking water, its use comes with crucial regulatory requirements.
This multi-layered composite pipe offers distinct advantages, making it a
strong contender for your next plumbing project. Let's delve into why it's
approved and what you need to know for compliant UK use.
Why PERT-AL-PERT is Ideal for Hot & Cold Potable
Water
1. Barrier Against Oxygen:The embedded aluminium layer acts as an
exceptional oxygen barrier. This is vital for central heating systems to prevent
corrosion of ferrous components (like radiators and boilers), but it also
contributes to the long-term hygiene of the pipe material itself for potable
water by minimising potential oxidative degradation.
2. Thermal Stability & Strength: PERT layers offer excellent resistance
to high temperatures (typically continuous operation up to 60°C or higher,
depending on pressure, with peak tolerance often around 90-95°C) and good
pressure-bearing capacity. The aluminium layer adds significant mechanical
strength, rigidity, and dimensional stability.
3. Corrosion Resistance: Unlike metal pipes, PERT-AL-PERT is completely
immune to corrosion and scale build-up from water minerals or electrolytic
action, ensuring consistent water flow and quality over decades.
4. Low Thermal Expansion: While plastic pipes expand with heat, the
aluminium core in PERT-AL-PERT drastically reduces linear thermal expansion
(similar to copper). This minimises stress on fittings and the need for
excessive expansion loops, leading to potentially neater installations,
especially in longer runs.
5. Lightweight & Flexible:Easier to transport, handle, and install
compared to rigid copper or steel pipes. It can often be bent by hand (within
specified radii) reducing the number of fittings needed and potential leak
points.
6. Longevity: Correctly installed and certified PERT-AL-PERT systems are
expected to have a service life exceeding 50 years for potable water
applications.
The Non-Negotiable Requirement: WRAS Approval
In the UK, the Water Supply (Water Fittings) Regulations 1999 (and the
equivalent Scottish Byelaws) govern all materials and products that come into
contact with public drinking water. Compliance is demonstrated primarily through
WRAS (Water Regulations Advisory Scheme) approval.
What is WRAS Approval?
It means the specific pipe product (including its make, model, size, and
any associated fittings intended for potable use) has undergone rigorous
testing. This testing evaluates:
Non-toxicity:Ensuring no harmful substances leach into the water that could
endanger human health.
Taste and Odour:Confirming the material doesn't impart an unpleasant taste
or smell to the water.
Durability & Suitability: Verifying the material is fit for purpose
under typical UK water conditions and temperatures.
Must Have Certification:Never install PERT-AL-PERT pipe for potable water
unless it carries valid WRAS approval. Look for the WRAS logo and a specific
product approval number. This information should be clearly marked on the pipe
itself and available from the manufacturer/supplier.
Check the List:You can verify a product's approval status using the
WRAS.
Installation Best Practices for Potable Water Systems
1. Use WRAS Approved Fittings: Just like the pipe, all fittings
(compression, press-fit, or push-fit) used on the potable water sections must
also be WRAS approved. Using non-approved fittings invalidates the system
compliance.
2. Follow Manufacturer Instructions:Adhere strictly to the pipe and fitting
manufacturers' guidelines regarding:
Cutting:Use proper pipe cutters for a clean, square cut.
Deburring: Remove any internal/external swarf or burrs after cutting.
Bending: Respect the minimum bend radius to avoid kinking or damaging the
layers.
Joining: Use the correct method (compression, press, push-fit) and tools as
specified. Ensure inserts are used where required (especially for compression
fittings on plastic pipes).
3. Avoid Contamination: Keep pipe ends sealed before installation and
during storage. Protect pipes from dirt and damage on site. Flush the system
thoroughly before commissioning.
4. Competent Installation: Work should be carried out by a competent
plumber familiar with plastic pipe systems and UK water regulations.
PERT-AL-PERT vs. Other Common UK Potable Water Pipes
Copper:Traditional, well-understood, WRAS approved. Susceptible to
corrosion (especially in aggressive water areas), scaling, requires
soldering/flux (potential contamination risk if not done perfectly), higher
material cost, theft risk. PERT-AL-PERT offers easier installation and inherent
corrosion resistance.
PEX (PEX-a/b/c):Flexible plastic, WRAS approved options available.
Excellent for retrofits. Requires more clips/supports due to higher thermal
expansion, not an oxygen barrier (needs barrier PEX or other protection for
heating). PERT-AL-PERT has lower expansion and is inherently barrier.
PPR (Polypropylene Random Copolymer): Rigid plastic, fused joints, WRAS
approved options. Very robust but requires specialist welding tools, less
flexible. PERT-AL-PERT is more flexible and uses common mechanical joining
methods.
Conclusion: A Safe and Efficient Choice for UK Homes and
Buildings
PERT-AL-PERT pipe is a fully viable and increasingly popular material for
both hot and cold potable water systems in the UK. Its combination of oxygen
barrier properties, strength, thermal stability, corrosion resistance, and
reduced expansion makes it a technically excellent solution.
The critical factor is ensuring compliance：Always useWRAS-approved
PERT-AL-PERT pipe and WRAS-approved fittingsspecifically listed for potable
water contact. Ensure installation follows manufacturer guidelines and UK water
regulations, preferably by a qualified professional.
By choosing certified PERT-AL-PERT and installing it correctly, you benefit
from a durable, efficient, and safe piping system for delivering drinking water,
designed to last for decades. When sourcing materials in the UK, always
prioritise WRAS certification for complete peace of mind and regulatory
compliance.
