What size plastic pipe are used for radiators? So, when it comes to the installation of a modern central heating system, the pipework is an integral part. For most systems, 15mm diameter copper piping is used for the radiator circuits, while pipes connecting the boiler, pump and points where the circuits split off will usually be 22mm or 28mm.. Polybutylene pipe, also known as PB or Poly-B pipe, are a flexible alternative to copper in both hard and soft water areas. A common type of plastic piping suitable for hot and cold water and central heating installations. Polybutylene pipe is lightweight and it's soft material is especially handy for long runs as it's very easy to bend.

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While plastic pipes can be used to transport hot and cold water, for central heating installations a special type of barrier pipe is needed. These are typically PEX or BPEX pipes, which are slightly thicker than standard plastic piping. It is important to note that plastic pipes should never be used in any Gas installation there are specific.. Our push-fit plastic plumbing system Hep2O is available in straight lengths or coils in both Standard or Barrier pipe, both of which are accepted by British Gas/Scottish Gas Central Heating Care Contracts. In this post, we take a look at the key features of each. Hints and tips for trouble-free Hep₂O installation.