Should I Ask My Plumber to Use Poly Welded Fittings Instead of Compression Fittings?
If you're replacing a water service or installing new poly pipe, you may have heard terms like electrofusion, butt welding or compression fittings. It's a common question we get at All Done Plumbing:
"Should I ask my plumber to use poly welded fittings instead of compression fittings?"
The short answer is not necessarily.
The best choice depends on the size of the pipe, the application and the experience of the installer.
Compression fittings are a proven solution
High-quality compression fittings from reputable manufacturers such as Philmac and Plasson have been used throughout Australia for decades.
When they're installed correctly on quality polyethylene pipe, they're incredibly reliable and can provide decades of trouble-free service. It's not unusual for a well-installed compression fitting to still be performing perfectly after 40 or 50 years.
Compression fittings are quick to install, easy to maintain and ideal for many residential and commercial plumbing applications.
So why choose electrofusion?
Electrofusion fittings are different because they actually weld the pipe and fitting together.
Using a specialised welding machine, electrical current heats the fitting, melting both the fitting and the pipe into a single fused joint. Once completed correctly, there are no seals or O-rings holding the joint together - it's effectively one continuous piece of polyethylene.
This creates an exceptionally strong, permanent connection.
Where electrofusion really makes sense
One of the biggest advantages of electrofusion is on larger pipe sizes.
Once you reach around 50mm diameter and above, the cost of electrofusion fittings often becomes much more competitive than equivalent compression fittings. In some cases, electrofusion fittings can actually be the more economical option.
For larger water mains, commercial installations and infrastructure work, this can make a significant difference to the overall project cost.
Is electrofusion always better?
Not necessarily.
While the finished joint is excellent, electrofusion installation requires more preparation and greater attention to detail.
The pipe must be cleaned properly, the outer surface scraped to remove oxidation and the fitting aligned correctly before welding. Small mistakes during preparation can affect the quality of the finished weld.
Compression fittings, by comparison, are generally more forgiving and faster to install, provided they're fitted correctly.
Like most things in plumbing, the quality of the installation is often more important than the fitting itself.
What about butt welding?
Butt welding is another method used to join polyethylene pipe.
Instead of using a coupling, the ends of two pipes are heated and pressed together under controlled pressure, creating a continuous welded joint.
Butt welding is commonly used on larger diameter pipelines for civil works, water authorities and major infrastructure projects, where long continuous pipe runs are required.
So what should you choose?
For most homes, farms and small commercial properties, quality compression fittings from trusted brands like Philmac or Plasson are an excellent choice and have a proven track record of long-term reliability.
For larger diameter pipelines or specialised installations, electrofusion can provide a stronger permanent welded connection and may even reduce fitting costs once pipe sizes exceed 50mm.
There isn't a one-size-fits-all answer. The right fitting depends on the project, the pipe size and the environment it's will be installed in.
At All Done Plumbing, we choose the installation method that best suits each job—not simply the newest or most expensive option. Our goal is always to provide reliable plumbing systems that will continue performing for many years to come.
If you're planning a new water service, upgrading existing pipework or have questions about polyethylene pipe systems, contact All Done Plumbing. We'll explain the options and recommend the solution that's right for your property.