Multi-layer Composite Pipe


Emmeti Alpert MultiLayer Composite Pipe is commonly used in Underfloor Heating and low temperature Wall Hung Radiator systems because of its flexibility and strength. The pipe can be easily formed and will retain its shape which makes installation of underfloor heating loops extremely simple.

Alpert MLCP –When used with the Emmeti range of sanitary manifolds and monobloccos is a WRAS approved system for use with Hot and Cold water supplies.

A range of accessories and fittings are available to aide installation including Monoblocco connectors, pipe preparation tools, tacker guns, pipe clips, castellated panels and bend supports.

Technical Data

Multi-layer pipe for low temperature heating systems only, made from a 5 layer composite material with PE-RT as the inner and outer layers with a 0.25mm thick aluminum core which is bonded to the inner and outlayer using a high performance adhesive. Maximum operating pressure 10 bar; maximum operating temperature 70oC. The 5 layers are as follows:

  • PE-RT Outer Layer – Protects the aluminium core from expansion as it can withstand high temperatures whilst maintaining its strength
  • Adhesive layer – Permanently bonds the outer PE-RT layer to the aluminium core.
  • Aluminium layer – thin layer of aluminium which provides a solid oxygen barrier to prevent corrosion of the heating system components and gives form retention when shaped.
  • Adhesive layer – Permanently bonds the inner PE-RT layer to the aluminium core.
  • Inner layer – Inner layer of clear, smooth PE-RT. Preventing pressure drops from water flow, and preventing deposit accumulation and corrosion.

Available in 16mm x 2mm, 100m, 200mm & 500m coils and 20 x 2mm in 100 and 240m coils.

pipe composition



Emmeti Underfloor Heating Manifolds Sales Brochure

Product and system guide with range information, product features and examples for Under Floor Heating applications


Technical Data Sheet - Alpert MLCP Pipe for UFH Only


What is crimp fitting or crimping?
There are many different systems on the market. Generally in the UK we use press fittings, which are a form of crimping. Connection is reached by pushing the outer sleeve to pipe, compressing it between the sleeve and  the inner brass piece. This is achieved using a mechanical press tool. Emmeti offer a range of these, please ask for further information.

How do I connect 22mm Hep2O pipe to your 1” manifolds?
Please purchase U9240018 22mm x 1” BSP Male copper adaptor. Ensure you follow the pipe manufacturer’s instructions on how to connect to 22mm copper adaptors.

Are you able to join pipes under the floor?
This is achievable; you must ensure the joint is sealed with a protective tape (permanent adhesive like duct tape) to ensure screed does not seap in to the monoblocco pipe connector, as this will erosion of the seals over time, and perhaps create leaks. However where possible this should be avoided.

How do I remove permanent airlocks in line in a pipe that is higher than the existing system air vents?
If the pipe is exposed, you can cut into it, and place a tee-piece (code 28103200), with two inline 24x19 monoblocco threads and a 1/2" FBSP connection, facing this upwards (fitted as an inverted tee). Choose monoblocco connectors from our range to match your pipe (take care of the pipe wall thickness). Then screw in a manual air vent 00400004 into the tee.

Do I need to calibrate the underfloor heating pipe prior to fitting the monoblocco?
Only for MLCP (Alpert and Gerpex) to prepare the pipe and ensure correct monoblocco fitting. Emmeti stock a range of calibration tooling for Multilayer pipe. (16mm calibrator U9280001)

Can underfloor heating pipe be used for radiator central heating?
Emmeti’s range of PE-Xa and PE-Xc is suitable to be used in general heating applications, with maximum operating temperatures of 95oC and 90oC respectively. Our Gerpex range is the most suitable for high temperature radiator applications due to its maximum operating temperature of 95oC

What is the difference between PE-RT/AL/PE-RT (Alpert) and Gerpex MLCP?
Both Alpert and Gerpex are Multilayer Composite Pipes, Alpert is made up of layers of PE-RT and Aluminium whereas Gerpex is made up of layers of PE-Xb (and PE-HD for sizes over 40mm) and Aluminium. Alpert is designed for UFH and low temperature heating applications due to its maximum operating temperature of 70oC. Gerpex is designed for a wide range of sanitary and heating applications. It’s maximum operating temperature is 95oC.

Does Emmeti offer a pipe repair coupling?
Yes; however our fittings are sold separatley to be made in to a coupling;  a straight male-male threaded fitting 28103080 and 2 Monoblocco connectors, one on each side of the fitting (correct for type and size of pipe). Threaded fittings and Monoblocco connectors