All you need to know about Hep2O push-fit plastic plumbing pipe

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2022-01-30 23:00:00

A question plumbers often ask us is the difference between Standard and Barrier pipe. Our push-fit plastic plumbing system Hep2O is available in straight lengths or coils in both Standard and Barrier pipes.

How is straight pipe available and when should you use it?

Straight lengths of Hep2O Standard and Barrier pipe are supplied in metric 15mm, 22mm,  28mm and imperial  1/2" , 3/4" and 1" diameters. Straight pipe is just as flexible as coiled pipe and is primarily intended for exposed pipework where neatness is vital or where only a short length of pipe is required.

The difference between Polybutylene (PB) and Cross-linked Polyethylene (PEX) pipe

There are two main pipe materials on the market, Polybutylene (PB) and Cross-linked Polyethylene (PEX) and

Hep2O and competitor pipe rolled out-1

 both have different properties.

PEX pipe is relatively stiff and when taken from the coil retains a ‘spring-like quality, which can make it diffi

cult to work with, particularly on long runs and when cabling through joists or


Polybutylene, in comparison, is cured on massive drums, and the plastic memory means that when you uncoil it lays flatter, as seen in the image below. It’s also very flexible, so easy to work with in all situations. Hep2O pipe is all PB.

What’s the benefit of Hep2O pipe coils?


A unique characteristic of Hep2O pipe coil is its remarkable ability to remain straight once uncoiled, unlike some other plastic materials which act like a spring and makes handling so awkward that two men may well be required to carry out a relatively simple job. Hep2O pipe is much easier to handle and much easier to cable because of its inherent tendency to stay where it’s put.

Coiled Hep2O pipe is supplied in 15mm, 22mm, 28mm and 1/2", 3/4" and 1" diameters, in a SmartPack™ dispenser.

  • Choice of Standard or Barrier pipe
  • Uncoiled pipe retains its flexibility
  • For installations into screed, use the Hep2O ‘Pipe-in-Pipe’ system. This incorporates Hep2O Barrier pipe in a pre-sheathed conduit as seen below.



Features of standard pipe

  • Suitable for domestic hot/cold water and heating applications
  • When used for heating, a suitable inhibitor such as Sentinel or Fernox MB1 should be used

Features of barrier pipe

  • Designed for central heating systems
  • Incorporates an oxygen barrier to inhibit oxygen permeation
  • Use of inhibitors is recommended as corrosion can occur in all types of the system regardless of pipe material
  • It  may also be used for domestic hot and cold water services

Note: Hep2O pipe is NOT suitable for conveying gas, oil or underground supplies.

Want to find out even more about Hep2O push-fit plumbing system? Click here to head to our dedicated webpage.