The best MLCP pipes, compared.
Top pick: Adept 16 × 2 mm PERT-AL-PERT, 50 m – Highest score at 74: stated 16 × 2 mm, 50 m, a 40–95°C and 10 bar bullet, and a WRAS line with no approval number. Not a lab test. Best value: Wärmer System 16 mm PERT-AL-PERT, 100 m – About £0.75 a metre on a 100 m, 16 mm coil, score 67. Heating only: the listing does not say WRAS. Updated 23 October 2026.
MLCP pipe is multilayer composite pipe: plastic, adhesive, aluminium, adhesive, and plastic. You buy a coil in the UK for an underfloor loop, a plumbing run, or a radiator tail that should hold a bend and keep oxygen out of the heating water. You tell a suitable coil by the job. Wholesome water in England and Wales sits under regulation 4 of the Water Supply (Water Fittings) Regulations 1999. A heating-only loop is set by outside diameter and wall together, by coil length, and by an oxygen barrier. On this pipe the aluminium is that barrier. A 16 mm coil is not 15 mm copper, and a press jaw marked U will not close a fitting cut for TH. A WRAS line on a listing helps only when a current approval matches that pipe, with a number and an expiry. The continuous temperature is the application class on a datasheet, not the highest figure in a bullet. Diameter, wall, length, and whether regulation 4 applies are set out in the [MLCP pipe buying guide](/hub/diy-supplies/mlcp-pipe/sub/mlcp-pipe-buying-guide).
MLCP pipe is multilayer composite pipe: plastic, adhesive, aluminium, adhesive, and plastic.
26 products checked · 64 hrs invested · +24,100 readers
Swipe for more
1-2 of 7
Personal buying guide
Question 1 of 2
What should the coil do?
A 50 m coil of 16 × 2 mm PERT-AL-PERT at £64.99 is about £1.30 a metre, which is the length in this set that can cover a short underfloor circuit or several radiator tails without a second reel. The bullets say WRAS approved, made in Europe, a 25-year manufacturers guarantee, service temperatures of 40–95°C and 10 bar, and an aluminium core said to stop oxygen ingress. Amazon shows 4.5 from 7 reviews, and that star line and the best-sellers rank match the 25 m ASIN B08CHFN7K1, so those seven ratings are not a separate test of the 50 m coil. No approval number or expiry is printed, and the colour field is empty. The bullets do not include press fittings, so a prompt on the page about fittings goes unanswered. It is the top pick in this set when you want the common 16 × 2 mm size with a temperature line and a WRAS bullet on a 50 m coil, and the wrong reel if you need one 100 m loop or an approval number you can look up.
Pros
Cons
Best for: You want 50 m of 16 × 2 mm with a printed temperature line and a WRAS bullet, and you will check any approval number yourself.
Less suitable: A single loop near 100 m, or a kitchen main where a bullet is not enough without a current approval number.
Specifications
Common questions
Does the listing say this coil is WRAS approved?
The bullets say WRAS approved, made in Europe, with a 25-year manufacturers guarantee. The file does not print an approval number or an expiry date.
Are press fittings in the box?
The bullets do not say fittings are included. A prompt on the page asks whether fittings are included and the bullets do not answer it.
Do the 4.5 stars belong only to the 50 m coil?
The star line is 4.5 from 7, and the best-sellers rank matches the 25 m ASIN B08CHFN7K1. There is no separate review text in this file.
The 25 m Adept coil is the same 16 × 2 mm PERT-AL-PERT story as the 50 m reel, at £36.99, about £1.48 a metre, and the colour line says white. The bullets again say WRAS approved, 40–95°C, 10 bar, and an aluminium core against oxygen ingress, with a 25-year manufacturers guarantee and origin Poland. The star line is 4.5 from 7 and the best-sellers rank matches B08CHDM6Y4, so you are not looking at a second sample. Twenty-five metres is the shortest 16 mm coil in this set, which suits a visible repair and runs out quickly on a screeded loop. Fittings are not listed. It is the short white coil when the run is under 25 m and you already accept the shared rating, and a poor substitute for the 50 m or 100 m reels when the loop has to finish without a joint.
Pros
Cons
Best for: A short visible 16 × 2 mm repair where 25 m is enough and white is stated on the listing.
Less suitable: An underfloor loop that needs 50 m or 100 m in one piece.
Specifications
Common questions
Is 25 m enough for an underfloor loop?
The title and bullets call it underfloor heating pipe at 16 × 2 mm and 25 m. The file does not give a loop length. It is the shortest 16 mm coil in this set.
What temperature and pressure are printed?
The bullets say service temperatures 40°C to 95°C and a maximum working pressure of 10 bar. They do not name an ISO 21003 application class.
Does the colour field say white?
Yes. The colour line says white. The 50 m file in this set does not repeat a colour line.
This 100 m coil is listed as 16 mm × 2 mm PERT-AL-PERT at £74.99, about £0.75 a metre, which is the lowest price per metre in the seven and the only reel here long enough for a supplier’s 100 m underfloor cap in one length. The title and a bullet name an aluminium oxygen barrier, the maximum pressure line is 10 bar, the colour is white, and the weight is 12 kg. There is no degree figure and no WRAS line, the material field says polyethylene, and the manufacturer line is PSW TRADE SUPPLIERS LTD with origin China. Amazon shows 4.3 from 5, and the only review text is one UK note from 30 January 2026 that calls it very good quality and on time. That is not five written accounts of a buried loop. It is the best value when the job is heating and you want the metres, and the coil to skip when the pipe will supply a tap.
Pros
Cons
Best for: A heating loop where you want about 100 m of 16 mm pipe and you do not need a WRAS bullet.
Less suitable: A tap or any wholesome-water run, or a job that needs a printed temperature class.
Specifications
Common questions
Does this 100 m coil say it is WRAS approved?
The listing does not say WRAS. The material line says polyethylene. Country of origin is China, and the manufacturer line is PSW TRADE SUPPLIERS LTD.
What temperature does the listing allow?
No degree figure is printed. A bullet names underfloor heating, central heating, and hot or cold water distribution, and the maximum pressure line is 10 bar.
What do the reviews say?
The star line is 4.3 from 5. The only review text in the file is one UK note from 30 January 2026 that calls it very good quality and on time.
Fifty metres of 20 × 2 mm PERT-AL-PERT at £86.99 is about £1.74 a metre, and both the title and the opening bullet state the 20 mm outside diameter and the 2 mm wall. The bullets say WRAS approved, 40–95°C, 10 bar, and an aluminium core said to stop oxygen ingress, plus a 25-year manufacturers guarantee. There is no customer-review line, the material field is empty, and the image URL matches the 16 mm Adept coils, so the photograph is not proof of the 20 mm wall. A 2 mm wall on 20 mm is not the 20 × 2.25 mm size some UK trade sheets print, and this file does not say the fittings are interchangeable. Date first available is 7 July 2020, with a Floor Heating rank of 384 and no written reviews. It is the 20 mm coil when your fitting is cut for 20 × 2 mm, and the wrong order if you assumed every 20 mm MLCP pipe has a 2.25 mm wall.
Pros
Cons
Best for: A 50 m run whose fittings are made for 20 × 2 mm.
Less suitable: A job that needs 20 × 2.25 mm, or any buyer who wants written reviews before paying £86.99.
Specifications
Common questions
Is the 20 mm size only in the title?
The title and the opening bullet both say 20 mm diameter and a 2 mm wall, and 50 m. There is no separate dimension table.
Does the file include a star rating?
No customer-review line is printed. Date first available is 7 July 2020. The best-sellers line is 384 in Floor Heating.
Are fittings included?
The bullets do not list fittings. A prompt on the page asks, and the bullets do not answer it.
Twenty-five metres of 32 × 3 mm PERT-AL-PERT at £98.99 is about £3.96 a metre, the largest bare diameter in this set and the dearest per metre among the bare coils. The title and the opening bullet both state 32 mm, a 3 mm wall, and 25 m, and the bullets add WRAS approved, 40–95°C, 10 bar, an aluminium core against oxygen ingress, and a 25-year manufacturers guarantee. Origin is Poland. There is no customer-review line, no best-sellers rank, and no separate dimension table. Fittings are not listed, and a 32 mm press jaw is a different tool from a 16 mm jaw. It is the pipe when the run is already drawn at 32 × 3 mm, and an expensive spare if the manifold is 16 mm.
Pros
Cons
Best for: A short 32 × 3 mm run where the fitting size is already settled.
Less suitable: A 16 mm underfloor loop, or a buyer who wants reviews before spending £98.99.
Specifications
Common questions
Where is the 32 mm size stated?
The title and the opening bullet say 32 mm diameter, a 3 mm wall, and 25 m. There is no separate dimension table and no best-sellers rank.
Does the listing claim WRAS approval?
The bullets say WRAS approved, made in Europe, with a 25-year manufacturers guarantee, service temperatures 40°C to 95°C, and 10 bar. No approval number is printed. Country of origin is Poland.
Are there any reviews?
The file has no customer-review line and no review text.
This 25 m coil is listed as 25 × 2.5 mm PERT-AL-PERT at £67.99, about £2.72 a metre, with a thicker wall than the 16 mm Adept coils in the set. The bullets say WRAS approved, 40–95°C, 10 bar, an aluminium core against oxygen ingress, and a 25-year manufacturers guarantee, and the origin is Poland. There is no customer-review line, the material field is empty, and the image URL matches the smaller Adept coils. The file does not say a 16 mm fitting will fit, and 25 m is a short length at this diameter. Floor Heating rank is 440. It is the coil when the drawing already says 25 × 2.5 mm, and a costly guess if you only needed 16 mm or 20 mm.
Pros
Cons
Best for: A short run that is already specified as 25 × 2.5 mm.
Less suitable: A 16 mm underfloor loop, or anyone buying from the photograph alone.
Specifications
Common questions
How does the wall compare with the 16 mm coils?
This listing prints a 2.5 mm wall on a 25 mm outside diameter. The 16 mm Adept coils in this set print a 2 mm wall. The file does not say the fittings are interchangeable.
Is a temperature printed?
Yes. The bullets say service temperatures 40°C to 95°C and a maximum working pressure of 10 bar, plus a WRAS line with no approval number.
Where does the listing say it was made?
Country of origin is Poland. There is no customer-review line.
The red coil is the only pre-insulated pipe in this set, listed at £192.99 for a title size of 20 mm × 50 m, about £3.86 a metre. The title says PEX-AL-PEX and WRAS approved, and a bullet says the pipe is pre-insulated to reduce heat loss on hot and cold water or underfloor heating. The bullets do not state a jacket thickness, a thermal conductivity, a working temperature, or a pressure, so you cannot check the jacket against Approved Document L Table 4.4 from this page. The model field says IALPEX162/50B9 while the title and size field say 20 mm and 50 m, and the product dimensions are printed as 500 × 2 × 0.1 cm. There is no customer-review line. It is the coil to open when you specifically want factory lagging on a 50 m run, and the one to leave if you need a wall thickness or a jacket measurement before you bury it.
Pros
Cons
Best for: A 50 m run where you want factory insulation and you will confirm the jacket and the model code before you install it.
Less suitable: Anyone who needs a stated wall, a stated temperature, or evidence the lagging meets Table 4.4.
Specifications
Common questions
How thick is the factory insulation?
The bullets say the pipe is pre-insulated to reduce heat loss. They do not state a thickness or a thermal conductivity. Included components are the 20 mm, 50 m roll.
Why might the model code not match the title?
The title and the size field say 20 mm and 50 m. The model field says IALPEX162/50B9. The file does not explain the code. Product dimensions are printed as 500 × 2 × 0.1 cm.
Does it name a working temperature?
No degree figure and no pressure figure are printed. A bullet says it suits hot and cold water and underfloor heating, and the title says WRAS approved, with no approval number.
Scores use the seven amazon.co.uk listings in this set. Shelf prices are the 19 October 2026 capture. There is no laboratory test of these coils. A deburrer or a press fitting is not in the set. Documentation is weighted at 40, review evidence at 25, fit to the stated size at 20, and price per metre at 15. Shared stars, a material line that does not name aluminium, a mismatched image, a missing rank, and a model code that fights the title are cuts, not extra weight. The highest score is the top pick. Best value is the lowest price per metre, and it is not a WRAS claim.
Documentation
40%Named plastic, outside diameter and wall, a printed temperature and pressure, oxygen-barrier wording, and a WRAS bullet. A bullet with no approval number is not a full approval. A missing temperature line scores none of that part, even when 10 bar is printed.
Review evidence
25%Stars, and whether a UK note was written. No customer-review line scores nothing here. A shared star line is one sample, not two tests.
Fit to the stated size
20%A stated diameter and a coil length that matches the run. Fifty metres of 16 × 2 mm scores above 25 metres of the same size. Other diameters score for being a stated size, not as a universal underfloor reel.
Price per metre
15%Shelf price divided by the stated length, after size and the job. The lowest figure in this set is about £0.75 a metre. A low figure does not repair a missing WRAS line.
You are matching a coil to a diameter, a wall and a job, not to a star line. Seven amazon.co.uk listings are in this set, captured on 19 October 2026. Six are sold as bare PE-RT/AL/PE-RT, and on one of them the material field only says polyethylene. One is a red pre-insulated PEX-AL-PEX coil whose model code is not reconciled with the title. Shelf prices run from about £36.99 to about £192.99.
MLCP pipe is multilayer composite pipe. The wall is plastic, adhesive, aluminium, adhesive, and plastic. In UK listings that is usually written PERT-AL-PERT or PEX-AL-PEX. You buy a coil for an underfloor loop, a plumbing run, or a radiator tail that should hold a bend. The aluminium layer is the oxygen barrier heating systems expect. BEAMA's underfloor guidance treats that barrier as part of keeping oxygen out of the heating water.
These coils are sold as an outside diameter and a wall, such as 16 × 2 mm. That is not 15 mm copper. An olive or a press fitting cut for the other size will not seal. Buy the pair of figures the fitting was made for.
Jaw profiles are not interchangeable. A U jaw will not close a fitting cut for TH, or the other way round. If the joint will be buried and you have no matching press tool and no pressure test, stop and call a professional.
A bullet that says 40–95°C and names no application class is the bullet, not a continuous set-point. Do not copy another maker's class temperatures onto these coils. The shared 4.5 from 7 on the two Adept 16 mm coils is one star line, not two tests.
Start with the water. Wholesome water in England and Wales sits under regulation 4 of the Water Supply (Water Fittings) Regulations 1999. Scotland and Northern Ireland have their own fittings rules. A heating-only loop is specified by diameter, an oxygen barrier and a temperature class, not by a drinking-water approval. Buy outside diameter and wall together. The sizes stated in this set are 16 × 2 mm, 20 × 2 mm, 25 × 2.5 mm and 32 × 3 mm.
The plastic in the title should match the material line. PE-RT is not cross-linked. PEX is. Six coils here are sold as PE-RT/AL/PE-RT. On one of them the material field only says polyethylene. One title says PEX-AL-PEX and is pre-insulated. The aluminium is the oxygen barrier BEAMA expects on underfloor pipe. A material field that only says polyethylene does not name that layer, even when the title does.
Three typical situations, each with a recommendation from this comparison.
You are laying a 16 mm loop and you can pressure-test it before the screed. The Adept 16 × 2 mm, 50 m coil is the top pick at about £64.99, score 74, with a 40–95°C bullet and a WRAS line that has no approval number. The 4.5 from 7 is shared with the 25 m coil. A single loop near 100 m is a different reel.
You are replacing a short visible tail and the drawing already says 16 × 2 mm. The Adept 25 m coil is about £36.99, listed as white, with the same temperature and WRAS wording as the 50 m coil. It is the shortest 16 mm coil here, so it runs out on a screeded loop.
You need lagging where the pipe leaves the heated space. Approved Document L is the guidance, and Table 4.4 is the insulation row for a small pipe. The red pre-insulated coil is the only jacketed reel here, at about £192.99, and the listing states no jacket thickness. It is not evidence the jacket meets that table.
The top pick is the Adept 16 × 2 mm coil, 50 m, at about £64.99. It scores 74, the highest in this set, with a stated size, a 40–95°C and 10 bar bullet, and a WRAS line that does not include an approval number. The 4.5 from 7 reviews is the same line as the 25 m coil. It is not a laboratory test. Best value is the Wärmer System 16 mm × 100 m coil at about £74.99, score 67, about £0.75 a metre. The listing does not say WRAS, and the material field says polyethylene. Skip it for a tap.
Adept 16 × 2 mm PERT-AL-PERT, 50 m
Highest score at 74: stated 16 × 2 mm, 50 m, a 40–95°C and 10 bar bullet, and a WRAS line with no approval number. Not a lab test.
Wärmer System 16 mm PERT-AL-PERT, 100 m
About £0.75 a metre on a 100 m, 16 mm coil, score 67. Heating only: the listing does not say WRAS.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources listed below, plus the seven amazon.co.uk listings compared on this page. Listings captured 19 October 2026. Updated 23 October 2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the amazon.co.uk figures already stored for this set, captured on 19 October 2026. This is not a laboratory test of these coils, and a press fitting is not in the set.
