Pert vs Pex: The Pros and Cons of Each Pipe Material

PEX and PERT are two common types of plastic piping used in plumbing and heating systems. Both materials have their advantages and disadvantages, and choosing the right one for your project depends on several factors. In this article, I will compare PERT vs PEX and discuss their differences, installation and use, durability and maintenance, cost and environmental considerations, regulations and standards, and answer some frequently asked questions.

PEX, or cross-linked polyethylene, is a popular choice for plumbing and heating systems due to its flexibility, ease of installation, and resistance to freezing and corrosion. It is available in different grades, such as PEX-A, PEX-B, and PEX-C, each with its own benefits and drawbacks. PERT, or polyethylene raised temperature, is a newer type of plastic piping that is gaining popularity due to its higher temperature and pressure ratings, making it suitable for use in heating systems.

When comparing PERT vs PEX, it is important to consider factors such as the intended use, installation requirements, and cost. PEX is generally easier to install, but PERT is more durable and can withstand higher temperatures and pressures. Additionally, PERT is more environmentally friendly than PEX, as it is made from renewable resources and can be recycled.

Comparing PERT and PEX

As a plumbing professional, I often get asked about the differences between PERT and PEX pipes. Both are popular choices for plumbing and heating systems, but they have some distinct differences in their material properties, temperature resistance, and flexibility and strength.

Material Properties

PEX pipes are made of cross-linked polyethylene, which is a type of plastic that is resistant to corrosion and scale buildup. PEX pipes come in different grades, with PEX-A being the most flexible and PEX-B being the most rigid.

PERT pipes, on the other hand, are made of polyethylene of raised temperature resistance. This material is also resistant to corrosion and scale buildup, but it has a higher resistance to heat than PEX. PERT pipes are also more durable and resistant to damage than PEX pipes.

Temperature Resistance

While both PEX and PERT pipes can handle cold and hot water, PERT pipes can withstand higher temperatures than PEX pipes. PERT pipes can handle temperatures of up to 200°F (93°C), while PEX pipes can only handle temperatures of up to 140°F (60°C) for PEX-A and up to 180°F (82°C) for PEX-B.

Flexibility and Strength

PEX pipes are known for their flexibility, which makes them easy to install in tight spaces and around corners. However, PEX pipes can become brittle and crack in high-temperature environments, which can lead to leaks and other issues.

PERT pipes, on the other hand, retain their flexibility and durability even at temperatures as high as 95°C. PERT pipes also have excellent thermal memory, which allows for kink repairs.

In summary, PERT pipes are a better choice than PEX pipes for plumbing and heating systems that require high-temperature resistance, durability, and flexibility. While PEX pipes are more flexible, they can become brittle and crack in high-temperature environments. PERT pipes are made of a material that is more resistant to heat and damage, making them a more reliable choice for plumbing professionals.

Installation and Use

When it comes to installation, PERT pipes are easier to install than PEX pipes, as they don’t require special tools or fittings. This makes them an ideal choice for DIY projects or for professionals who need to quickly install a new plumbing system. PERT pipes are also easier to cut than PEX pipes, which can be an advantage when working in tight spaces or when making precise cuts.

Ease of Installation

PERT pipes can be joined using compression fittings, which are easy to install and require no special tools. PEX pipes, on the other hand, require crimp fittings or expansion fittings, which can be more difficult to install and may require special tools. PERT pipes are also less likely to kink than PEX pipes, which can be an advantage when working in tight spaces or when making sharp turns.

Plumbing Applications

PERT pipes are suitable for use in hot and cold water distribution systems, as well as in radiant heating systems. They are also suitable for use in potable water systems, as they are resistant to corrosion and chemicals. PEX pipes are also suitable for use in hot and cold water distribution systems, as well as in radiant heating systems. However, they may not be suitable for use in potable water systems, as they may leach chemicals into the water.

Heating Applications

PERT pipes are an excellent choice for use in underfloor heating systems, as they are resistant to high temperatures and can withstand the stress of being buried in concrete. PEX pipes are also suitable for use in underfloor heating systems, but they may not be as durable as PERT pipes. PEX pipes can also be used in PEX floor heating systems, which are becoming increasingly popular due to their ease of installation and energy efficiency.

In summary, when it comes to installation and use, PERT pipes are easier to work with than PEX pipes and are an excellent choice for use in hot and cold water distribution systems, as well as in radiant heating and underfloor heating systems. PEX pipes are also suitable for use in these applications, but may require more specialized tools and fittings.

Durability and Maintenance

When it comes to durability, PERT pipes have proven to be more resistant to damage than PEX pipes. PERT pipes are made with a high-density polyethylene material that provides toughness and longevity, making them more durable and long-lasting than PEX pipes. On the other hand, PEX pipes can become brittle and crack in high temperature environments, which can lead to leaks and other issues.

Resistance to Chemicals and Corrosion

PERT pipes are also more resistant to chemicals and corrosion than PEX pipes. They are less likely to break down or corrode when exposed to chemicals or harsh environments, which means they can last longer and require less maintenance over time. This makes PERT pipes a great choice for industrial and commercial applications where durability and resistance to corrosion are essential.

Crack and Leak Prevention

Another advantage of PERT pipes over PEX pipes is their crack and leak prevention. PERT pipes are designed to be more flexible and durable than PEX pipes, which means they are less likely to crack or leak under pressure. This makes PERT pipes a great choice for applications where leak-free performance is essential, such as in plumbing and heating systems.

In summary, PERT pipes are a more durable and long-lasting option than PEX pipes. They are resistant to chemicals and corrosion, and less likely to crack or leak under pressure. This makes them a great choice for a variety of applications where durability and leak-free performance are essential.

Cost and Environmental Considerations

Affordability and Value

When considering the cost of PERT vs PEX pipes, it is important to take into account the long-term value of each option. While PERT pipes may have a slightly higher upfront cost, they are more durable and resistant to damage than PEX pipes, which can become brittle and crack in high temperature environments. PERT pipes also retain their flexibility and durability even at temperatures as high as 95°C. This means that PERT pipes are a cost-effective option for those who want a reliable and long-lasting solution.

In addition, PERT pipes can be easily installed by a contractor, which can save you money on installation costs. The ease of installation also means that you can save time and money on repairs and maintenance in the long run.

Sustainability Factors

When it comes to environmental considerations, PERT pipes are a more sustainable option than PEX pipes. PERT pipes are made from high-density polyethylene (HDPE), which is a recyclable material. PEX pipes, on the other hand, are made from cross-linked polyethylene, which is not recyclable.

In addition, PERT pipes are an eco-friendly option for underfloor heating, as they offer high heat resistance and are suitable for underfloor heating applications. PERT pipes have a great flow capacity, which makes them an ideal choice for radiant heating systems.

Overall, when considering the cost and environmental factors, PERT pipes are a great option for those who want a low-cost, durable, and sustainable solution. With their ease of installation and long-term value, PERT pipes are a great investment for any homeowner or contractor looking for a reliable and long-lasting solution.

Regulations and Standards

When it comes to choosing between PERT and PEX pipes, it is important to consider the regulations and standards that apply to each type of pipe. In this section, I will discuss the certifications and approvals as well as industry compliance for both PERT and PEX pipes.

Certifications and Approvals

One important certification to look for when choosing between PERT and PEX pipes is WRAS approval. WRAS (Water Regulations Advisory Scheme) approval is a UK-based certification that ensures that a product complies with the regulations and standards set out by the UK water industry. Both PERT and PEX pipes can be WRAS approved, but it is important to check that the specific product you are considering has this certification.

Another important certification to look for is NSF/ANSI 61 certification. This certification ensures that a product is safe for use with drinking water. Both PERT and PEX pipes can be NSF/ANSI 61 certified, but again, it is important to check that the specific product you are considering has this certification.

Industry Compliance

When it comes to industry compliance, both PERT and PEX pipes have their own set of regulations and standards that they must adhere to. For example, both types of pipes must meet certain requirements when it comes to pressure loss and permeation.

In terms of pressure loss, PERT pipes have a lower pressure loss than PEX pipes. This means that PERT pipes can maintain a higher flow rate than PEX pipes, making them a better choice for applications where high flow rates are important.

When it comes to permeation, PEX pipes have a lower permeation rate than PERT pipes. This means that PEX pipes are less likely to allow contaminants to pass through the pipe and into the water supply. However, it is important to note that both types of pipes are considered to be thermoplastic, which means that they can be affected by high temperatures and may release chemicals into the water supply if they are not installed and used properly.

In conclusion, both PERT and PEX pipes have certifications and standards that they must adhere to, and it is important to consider these when choosing between the two. While PERT pipes may be better suited for applications where high flow rates are important, PEX pipes may be a better choice for applications where permeation is a concern.

Frequently Asked Questions

What are the cost differences between PERT and PEX tubing?

The cost of PERT tubing is generally higher than that of PEX tubing. The price difference is mainly due to the manufacturing process and the raw materials used. PERT tubing is made from high-density polyethylene (HDPE) that is modified to improve its properties, while PEX tubing is made from cross-linked polyethylene. However, the cost difference may vary depending on the brand, supplier, and location.

How do PERT and PEX compare in terms of durability and longevity?

PERT tubing has good resistance to stress cracking and chemical corrosion, making it a durable option for plumbing systems. However, PEX tubing is generally considered more durable and longer-lasting than PERT tubing due to its superior resistance to oxidation, chlorine, and other chemicals. PEX tubing is also more resistant to temperature changes and has a higher burst pressure rating than PERT tubing.

Can PERT be used interchangeably with PEX for all plumbing applications?

No, PERT and PEX tubing have different properties and are designed for different applications. While both types of tubing are suitable for hot and cold water plumbing systems, PERT tubing is best suited for underfloor heating systems, while PEX tubing is preferred for potable water systems. It is important to consult with a professional plumber to determine the appropriate tubing for your specific plumbing needs.

What are the main differences between PEX-A and PEX-B?

PEX-A and PEX-B are two different manufacturing methods for PEX tubing. PEX-A is produced using the Engel method, which involves heating the polyethylene and cross-linking it with peroxide. PEX-B is produced using the Silane method, which involves cross-linking the polyethylene with a silane compound. PEX-A tubing is more flexible, has better freeze resistance, and is more resistant to kinking than PEX-B tubing. PEX-B tubing is generally more affordable than PEX-A tubing.

Are there any advantages of using PERT-Al-PERT over PEX-Al-PEX?

PERT-Al-PERT and PEX-Al-PEX are both composite tubing that combines the benefits of plastic and metal. PERT-Al-PERT is made of a layer of PERT sandwiched between two layers of aluminum, while PEX-Al-PEX is made of a layer of PEX sandwiched between two layers of aluminum. PERT-Al-PERT tubing is more flexible and easier to install than PEX-Al-PEX tubing. It also has a lower coefficient of thermal expansion, which means it can handle temperature changes better than PEX-Al-PEX tubing.

What are the considerations for choosing pipe fittings for PE-RT systems?

PE-RT tubing requires specific fittings that are compatible with its properties. Compression fittings are commonly used for PE-RT tubing, but it is important to choose fittings that are approved for use with PE-RT tubing and that are designed to withstand the temperature and pressure of the system. It is also important to ensure that the fittings are properly installed to prevent leaks and other issues.