7 common Speedfit plumbing and heating questions answered

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As a world-leading plumbing systems provider of plastic pipes and fittings, every day we get plumbing and heating installation questions put forward to us.

In this blog post, we will be looking at 7 common plumbing and heating questions asked about Speedfit products by installers. Even with world-leading plastic plumbing solutions, like the Speedfit range, there can be problems during or after installation, if not used correctly.

Plastic plumbing system by Speedfit

Image: Plastic plumbing system by Speedfit

1. Do I need to insulate Speedfit plumbing pipes?


If there is a danger that pipes might freeze or that there may be excessive heat loss then yes you should insulate the plastic pipe as if you would do with a copper pipe.

Plastic plumbing pipe

2. Do I need to use an insert every time I connect Speedfit pipes to a fitting, and why are there two types of insert?


The simple answer is yes, always use an insert when installing Speedfit pipes as it supports the shape of the pipe.

We have two types of insert – the ‘STS’, or Superseal for plastic to plastic, and the ‘TSM’ for plastic to compression.

The ‘STS has an extra O-Ring, which helps to reduce the risk of leaks due to side load.

The ‘TSM’ insert does not have an O-Ring, and therefore allow more pipe into the fitting. This is important when using Speedfit pipe with compression fittings as use of a TSM insert allows the olive to sit further down the pipe. (Only TSM inserts should be used with compression fittings).

Plastic plumbing pipe insert

3. Can Speedfit pipe be buried in the floor screed?


Building regulations state pipe laid in screed must be removable, with the exception of underfloor heating projects.

We therefore supply a conduit that can be clipped to the concrete base. The Speedfit pipe can then run through the conduit and then be screeded over.

If at any time it needs to be replaced, the pipe can be disconnected at each end and pulled out. The installation of fittings under screed should be avoided, but where it is deemed necessary they must be installed in boxes with removable lids so they can be serviced.

Burying plastic plumbing pipe in floor screed

4. Can I connect Speedfit pipe directly into compression fittings?


Yes, but only if they are compatible.

Compression fittings with a short tube stop depth should not be used. Use a ‘TSM’ insert and follow the instructions of the compression fitting manufacturer when connecting to plastic pipework.

Connecting plastic plumbing pipe to compression fittings

5. What is the difference between Speedfit PB (Polybutylene) and Speedfit PEX pipe?


The PB is more flexible than PEX, as there is less memory in the coil. Both versions are barrier pipes and can be used for the same types of installation.

Difference between plastic plumbing pipes

6. What temperatures and pressures are your pipe and fittings approved to work at?


Our pipe and fittings are approved to work at the following:

– 12 bar at 20°C
– 6 bar at 65°C and,
– 3 bar at 82°C – 105°C max, but they can withstand 114°C intermittently for short periods in case of thermostat malfunctions.

Fittings that are not suitable for central heating have a maximum temperature of 65°C.


7. For plumbing and heating, what pressure should you test pipe and fittings at?


All pipes should be hydraulically tested. Test your pipes at 2 bar for 10 minutes and then at 10 bar for 10 minutes.

Do you have a question for us on plumbing and heating or our Speedfit range of plastic fittings & pipes? If so, please contact us.


See also…

Why Plastic Continues to Push Boundaries in Modern Kitchen Installations

5 ways JG Speedfit is helping you out of tight space plumbing projects

Save Installation Time with Push-Fit Fittings

5 Reasons to Choose Plastic Plumbing Fittings & Pipe

Plastic Push-fit Fittings Myths

Author: JG Marketing