If you're a homeowner, contractor, or a passionate DIY'er you might have come across the terms PEX A and PEX B when researching for your plumbing solutions. Each offers unique advantages and, for most, the choice between PEX A and PEX B can be complex. In this article, we'll embark on a deep dive into PEX A vs PEX B to help you make the correct choice based on your needs and preferences.
Getting to Know PEX: The Basics
Before comparing PEX A and PEX B, it's essential first to understand what PEX means. PEX, short for cross-linked polyethylene, is a flexible plastic material used for various purposes such as radiant heating systems, domestic water piping, and insulation for high voltage electrical cables, among other things. The term ‘cross-linked’ refers to the process of strengthening the plastic by chemically bonding the polyethylene molecules to one another, thus forming a network of stronger bonds.
The two primary types of PEX material are PEX A and PEX B. Both are excellent options for residential and commercial plumbing due to their durability, flexibility, and cost-effectiveness. However, they differ in several ways, which will be the primary focus of our article.
Detailing the PEX Manufacturing Processes
PEX A: The Engel Method
PEX A is the highest quality PEX on the market and its manufacturing process, called the Engel Method, plays a massive role in this. In this process, the cross-linking happens while the HDPE (High density polyethylene) is in a melted state before it is processed into the PEX tubing shape. This complete early cross-linking leads to evenly distributed cross-links in the finished product, resulting in a very flexible and durable material.
PEX B: The Silane Method
On the other hand, PEX B tubing is manufactured using the Silane, also known as the 'Moisture Cure' method. Here, cross-linking is completed after the HDPE is processed into tubing, exposed to heat and then cooled down. Consequently, the cross-links are random and less evenly distributed, leading to slightly less flexibility than PEX A.
Comparing Features: PEX A vs. PEX B
Both PEX types are beneficial in their ways, but there is certainly a comparison to be made depending upon the desired application.
Flexibility
- PEX A, due to its manufacturing process, is more flexible than PEX B. This flexibility often makes it easier to install as it can bend around corners without needing excess fittings.
- PEX B, though less flexible, is still quite adaptable and can be installed quite conveniently.
Resilience to Chlorine
- Both PEX A and PEX B are rated for the same chlorine resistance, however, PEX A has shown to have a better long-term resistance to chlorine when compared to PEX B.
Temperature Tolerance
- Both types can withstand the same temperature ranges, making them both ideal for hot and cold water systems.
Ease of Installation
- The method of installation significantly depends on the type of fittings used. Both can be installed using either the expansion or crimp method, although the former is more common with PEX A due to its higher flexibility, while PEX B is often used with the latter.
Cost Comparison: PEX A vs. PEX B
The cost is another aspect to consider when comparing PEX A vs. PEX B. As it stands, PEX A is generally more expensive than PEX B. The increased cost is tied to its superior flexibility and ease of installation, which often results in less work and fewer fittings.
PEX B is more affordable and still offers excellent quality for your plumbing needs. However, the installation can be more labor-intensive, and depending on the configuration of your project, may require more fittings due to its less flexible nature.
Frequently Asked Questions about Pex A Vs Pex B
How flexible is PEX A compared to PEX B?
PEX A is more flexible than PEX B, thanks to the type of manufacturing process it goes through. It allows for easy installation, with fewer fittings required. This can save the user on time and material costs. On the other hand, PEX B, albeit gradually less flexible, is still more flexible than traditional copper piping.
Which is more resistant to chlorine, PEX A or PEX B?
In terms of chlorine resistance, PEX B typically comes out on top. The manufacturing process used for PEX B makes it more resistant to chlorine, which can extend its lifespan if your supply water has high levels of chlorine.
Can I expose PEX A and PEX B to UV light?
Both PEX A and PEX B should not be exposed directly to UV light for prolonged periods as it might cause them to deteriorate over time. However, PEX A can withstand UV light for a slightly longer period (around 6 months) compared to PEX B (approx. 30 days). But it’s always recommended to limit their exposure to UV light as much as possible.
How thermal memory works in PEX A and PEX B?
PEX A has what you call 'thermal memory'. This means that if it gets deformed by a stretch or a kink, you can apply heat and the pipe will return to its original shape. This feature is due to the manufacturing process it goes through. On the contrary, PEX B does not have the thermal memory feature.
Which one is cheaper, PEX A or PEX B?
PEX B typically tends to be less expensive than PEX A. However, the overall cost can also depend on factors like the scale of your project, number of connections required, and labor fees if a professional is doing the installation.
Can both PEX A or PEX B be used for hot and cold water?
Yes, both PEX A and PEX B pipes can handle hot and cold water supply. They have quite a high-temperature rating and can handle the freeze-thaw cycles. Care should be taken to not exceed the manufacturer’s recommended temperature and pressure ratings.
What is the lifespan of PEX A and PEX B?
The lifespan of both PEX A and PEX B systems can last for over 40 years, provided they are installed correctly and the local water conditions are within the pipe’s acceptable parameters. The actual duration can vary based on several external factors like water quality, UV exposure, and temperature fluctuations.
Pros of PEX A
Flexibility
Less Fittings Required
PEX A tubing, due to its incredible flexibility, requires fewer fittings than PEX B. The fewer the connections, the less likely there are chances of leaks, which makes PEX A a cost-effective and time-efficient solution.
Easier to Maneuver
The tubing is also easier to maneuver around corners without needing elbow joints, further reducing installation time and cost. This makes PEX A an excellent choice for complex plumbing systems with lots of twists and turns.
Durability
Resistance to Chlorine
PEX A holds up well against chlorine interaction—a common element in public water supplies—making it a reliable choice for cities and towns that heavily chlorinate their water supply.
Stress Cracking
PEX A exhibits higher resistance to stress-induced cracking than PEX B. This ensures a long-lasting plumbing system with reduced maintenance or unexpected repairs.
Expansion and Contraction
PEX A can expand and return to its original size, allowing it to accommodate freezing water that could otherwise cause pipes to burst. This is particularly useful in colder climates where pipes are prone to freezing.
Cons of PEX A
Vulnerability
UV Light
PEX A is more vulnerable to UV light than PEX B. If exposed to UV light over long periods, it can lose its strength and flexibility. Therefore, it's not suitable for use in areas with strong sunlight unless adequately shielded.
Scratches
PEX A is also more susceptible to scratches, which can cause leaks over time. It’s important to handle PEX A with care during installation to avoid this issue.
Cost
PEX A tubing and its required expansion tool are more expensive than PEX B and its tools. This additional upfront cost can add up, especially for larger projects or where budget is constrained.
Pros of PEX B
Strength
PEX B is incredibly strong and can withstand high pressures, making it an ideal solution for high-pressure delivery systems.
Resilience
UV Light
PEX B has greater resistance to UV light, making it a good choice for outdoor plumbing applications or where exposure to sunlight is a concern.
Chemical Resistance
PEX B generally has a higher resistance to certain chemicals. If your household water contains strong disinfectants or you use chemical drain cleaners, PEX B is often the better choice.
Cons of PEX B
Flexibility
Unfortunately, PEX B is not as flexible as PEX A and requires more connectors and fittings. More connectors mean more points of potential failure, which might lead to more maintenance down the road.
Installation
PEX B is harder to install than PEX A due to its stiffness. It requires more time and effort, especially when navigating corners and tight spaces, which could potentially increase labor costs.
Chemical Interaction
PEX B can also interact with certain chemicals more so than PEX A, which could alter the taste and odor of the water. If the water source is chemically complex, PEX B might not be the best option.
Less Expansion and Contraction
PEX B is less likely to expand or contract, which can be a disadvantage in freezing conditions. It is therefore not recommended for cold climates areas where pipes can potentially freeze.
Myths and Misconceptions about PEX A and PEX B
There are a variety of myths and misconceptions about PEX (cross-linked polyethylene) plumbing pipes, particularly when comparing PEX A and PEX B. In this section, we will debunk some of those myths and separate fact from fiction.
Myth 1: PEX A is Always Superior to PEX B
Misconception
A common idea is that PEX A, often marketed as the premium grade PEX, is considerably superior to PEX B in every aspect.
Reality
PEX A does have benefits such as enhanced flexibility and a higher degree of cross-linking. It's easier to install in tricky areas and it withstands freezing conditions better. Yet, PEX B also has its advantages. It is typically more budget-friendly and still delivers high performance, with excellent resistance to chlorine and high temperatures, making it a suitable choice for many applications.
Myth 2: PEX B is More Likely to Leak
Misconception
Some might believe that PEX B is more prone to leaks, given its less flexible nature and the fact it's a 'lower grade' of PEX.
Reality
PEX B is not necessarily more likely to leak. The possibility of a leak largely depends on the quality of the installation and the fittings used, rather than the type of PEX. Furthermore, PEX B has strong resistance to corrosion and scale build-up, which can reduce the risk of leaks over time.
Myth 3: PEX A is Always Worth the Extra Cost
Misconception
Another prevalent myth is that paying extra for PEX A is always worth it due to its higher quality.
Reality
While PEX A does have certain advantages, whether it's 'worth' the higher price entirely depends on the specific needs of your plumbing system. In numerous instances, the benefits of PEX B, coupled with its lower price, make it the more cost-effective choice.
Myth 4: PEX B Can't be used in Cold Weather
Misconception
There's a misconception that PEX B is not suitable for cold weather climates due to its lower resistance to freeze-break.
Reality
While PEX A has better resistance to freeze-break, that doesn't mean PEX B can't be used in frigid conditions. If installed and insulated properly, PEX B can still function effectively in cold weather.
Myth 5: All PEX A and B are Created Equal
Misconception
Some may think that all PEX A or B pipes from different manufacturers are the same, just because they fall under the same category.
Reality
While the categorization into PEX A and B informs about the production process and some general characteristics, there can still be considerable variances in the quality, durability and performance among different brands. It's crucial to buy from reputable manufacturers and suppliers to ensure you are getting a high-quality product.
By debunking these myths, we hope to shed some light on the misconceptions about PEX A and B. Remember, the choice between PEX A and PEX B largely depends on your specific requirements, budget, and personal preferences. Always consult with a professional to make the best decision for your plumbing needs.
Summary
So, in wrapping up our chat on "PEX A vs PEX B", it's pretty clear that there's no clear 'winner', it all comes down to what your requirements for a specific project are. PEX A, with its flexibility and ability to regain its shape might be the better choice for areas where a tight bend is required. Its downside is that it's more expensive compared to PEX B.
On the other side, we've got PEX B. It might not have the flexibility of PEX A, meaning you need to use more fittings, but hey, it's got its charms too! It's less costly and also has a higher burst pressure rating. So, if you're on a tight budget and working on a project that doesn't involve a lot of twists and turns, PEX B might be the way to go.
Ultimately, the choice between PEX A and PEX B boils down to your specific needs and personal preferences. Each type has its own benefits and shortcomings, making them suitable for different applications. So, the next time you're standing in the plumbing aisle, just remember that neither PEX A nor PEX B is superior to the other. It's all about picking the right tool for the job!
About Perfect Air & Water Services
Perfect Air & Water Services is your go-to HVAC company located right in the heart of Lakewood, NJ. For over a decade, we've been dedicating our skills and expertise to ensure your home or business enjoys top-tier air quality and perfectly balanced indoor humidity. We're a local, family-run business that truly cares about our community. Our team of seasoned experts is all about providing prompt, reliable service, executing everything from complex installations to routine maintenance with practical professionalism. So, whether you're freezing through winter or looking to beat the summer heat, count on Perfect Air & Water Services to keep your spaces comfortable all year round.
