Plastic Pipework Types and Their Applications

When it comes to plumbing, choosing the right plastic pipework types can make a massive difference in the performance and longevity of your system. Whether you’re a homeowner or managing an establishment, understanding the options available helps you make informed decisions - but it’s always best to leave installation and maintenance to the professionals. At All Needs Plumbing, we’ve seen firsthand how the right plastic pipes can save you time, money, and hassle down the track.

Common Plastic Pipe Types You’ll Encounter

PVC (Polyvinyl Chloride) Pipes

PVC pipes are a type of plastic pipe often used in Australia's plumbing. They are lightweight and rigid, making them easy to handle and install for specific applications. PVC resists corrosion and chemical damage, so it’s perfect for outdoor use, underground water mains, and drainage systems. 

On the other hand, PVC can break easily in cold weather and is not meant to be used with hot water because the high temperatures can ruin it. You’ll often see PVC pipes used in stormwater systems and wastewater drainage around homes and commercial buildings.

CPVC (Chlorinated Polyvinyl Chloride) Pipes

CPVC pipes are similar to PVC but have been chlorinated to improve their heat resistance. This means they can safely carry hot water without deforming or breaking down. CPVC is commonly used in residential and commercial hot water supply lines. Although it costs more than PVC, its ability to withstand temperatures up to around 90°C makes it a reliable choice for hot water systems. CPVC also resists corrosion and scaling, which helps maintain water quality over time.

PEX (Cross-linked Polyethylene) Pipes

PEX pipes have gained popularity because of their flexibility and durability. Unlike rigid pipes, PEX can bend around corners and obstacles without needing extra fittings, which reduces installation time and the chance of leaks. PEX is suitable for hot and cold water lines and is resistant to scale, chlorine, and freezing conditions. This makes it ideal for Australian homes where water quality and temperature vary. Because it’s so easy to work with, PEX is often the go-to choice for renovations or new builds where speed and reliability are essential.

HDPE (High-Density Polyethylene) Pipes

HDPE pipes are known for their toughness and flexibility. They are often used for underground water mains, gas lines, and agricultural irrigation because they resist corrosion, chemicals, and physical damage from soil movement. HDPE pipes can handle high pressure and last for decades without significant maintenance. While you won’t usually find HDPE inside homes, it plays a vital role in large-scale water and gas distribution systems.

ABS (Acrylonitrile Butadiene Styrene) Pipes

ABS pipes are black, lightweight, and stronger than PVC in terms of impact resistance. They are often used for drain and vent systems. ABS is easy to install, but less common in Australian residential plumbing because some local codes restrict its use. It’s best suited for specific drainage applications where shock resistance is essential.

Where Do These Pipes Fit In?

Water supply

PEX and CPVC pipes are your best options for indoor water supply, especially when hot water is involved. PEX’s flexibility makes it ideal for retrofits, while CPVC offers excellent heat resistance for hot water lines.

Drainage and sewer

PVC and ABS pipes efficiently handle wastewater and stormwater. Their rigidity helps maintain proper slope and flow, preventing blockages. PVC is more common due to its widespread approval and availability.

Outdoor and underground

PVC and HDPE pipes resist corrosion and damage from soil and weather conditions. HDPE’s flexibility allows it to withstand ground movement without cracking.

Special systems

PEX is often used in hydronic and radiant floor heating systems because it is flexible and can withstand temperature changes.

Pro-Tip: If upgrading your water lines, consider PEX for easier installation and fewer fittings. It can save you money on labour and reduce leak risks. Because PEX bends around corners, you avoid needing multiple joints, which are common leak points in plumbing.

What to Keep in Mind When Choosing Plastic Pipes

When selecting plastic pipes, consider the following factors:

Water temperature

If you need pipes for hot water, PVC is not suitable. Choose CPVC or PEX, which can handle higher temperatures safely.

Water pressure

Pipes must withstand the pressure of your water system. HDPE and PEX pipes handle high pressure well, while PVC and CPVC have pressure ratings that vary by size and thickness.

Chemical exposure

Some environments expose pipes to chemicals or aggressive water. HDPE resists most chemicals, making it ideal for industrial settings.

Flexibility and installation

Flexible pipes like PEX reduce installation time and the number of fittings needed, which lowers the chance of leaks. Rigid pipes like PVC require more fittings and precise cutting.

Local plumbing codes

Always check the local rules to ensure the type of pipe you want to use is allowed for that purpose. Some areas restrict ABS or certain plastics for potable water.

Longevity and cost

PVC is generally the most affordable, but is limited in use. PEX and CPVC cost more but offer better performance for hot water and flexible installations.

When in doubt, call us. We’ll help you choose the right pipework for your home or business.

Pro-Tip: Avoid exposing PEX pipes to sunlight. UV rays can degrade the material quickly, causing it to become brittle and fail. If you must use PEX outdoors temporarily, cover it with an opaque material or install it inside protective conduits.

Over the years, I’ve seen many customers switch from metal pipes to plastic pipework and never look back. One client had constant leaks with old copper pipes, but after we installed PEX, their water pressure improved, and they haven’t had a single leak since. These kinds of results make plastic pipes such a wise investment. Plus, the ease of installation means less disruption to your home or business during plumbing upgrades.

FAQs About Plastic Pipework Types

Is it better to use PVC or PEX?

PVC is great for cold water and drainage because it’s affordable and durable outdoors. PEX, however, is more flexible and can handle hot and cold water inside your home. It’s easier to install and reduces leak points but costs more. If you want reliability and ease of installation for indoor plumbing, PEX is usually the better choice.

Is PEX safe for drinking water?

Yes, PEX pipes meet Australian standards for potable water. They don’t leach harmful chemicals and are widely used in homes for the drinking water supply. Many plumbers, including us, trust PEX for safe, clean water delivery.

Is a 15mm pipe okay for a shower?

Yes, a 15mm pipe is typically sufficient for a standard shower. It provides good water flow and pressure for most households. However, a larger pipe size might be necessary to maintain pressure if you have a large showerhead or multiple outlets.

Where should you not use PEX pipe?

Avoid using PEX outdoors or in places exposed to direct sunlight because UV rays degrade the pipe material. Also, don’t use PEX for gas lines or where it may come into contact with certain chemicals. For these applications, HDPE or metal pipes are better suited.

What type of pipe is not recommended for a water line?

Some older galvanised steel and lead pipes should not be used because they can contaminate and rust, harming your health. Also, avoid using PVC for hot water lines as it can warp and fail.

What if I want to know more about plastic pipework types?

If you’re curious about which plastic pipework types suit your home or business best or want a professional to assess your plumbing needs, we’re here to help. At All Needs Plumbing, we offer a $0 callout fee, 24/7 same-day service, and a 15% seniors’ discount to make it easier to get expert help when needed. 

We can also save you $150 on installation if you want to upgrade your hot water system. Don’t hesitate to let us take care of your plumbing with the right plastic pipes for the job.

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