Proflo Pfxt5i

Understanding Water System Protection in the Modern Home

When I first noticed that annoying banging sound in my pipes after flushing the toilet, I had no idea I was about to embark on a journey into the world of plumbing expansion tanks. Fast forward several months and a flooded basement later, I’ve become something of an expansion tank enthusiast (yes, we exist!). Today, I want to share everything I’ve learned about the Proflo PFXT5I expansion tank—a small device that could save you thousands in water damage and extend the life of your water heater significantly.

My Expansion Tank Journey

Let me take you back to last winter. I was enjoying a hot shower when suddenly the water pressure dropped dramatically. Minutes later, I discovered water pooling around my water heater. The diagnosis from my emergency plumber? Thermal expansion had caused excessive pressure in my closed water system, damaging my relatively new water heater. The solution? Installing an expansion tank—specifically, he recommended the Proflo PFXT5I.

“What on earth is an expansion tank?” I asked. His explanation opened my eyes to an essential component of modern plumbing systems that most homeowners (like me) know nothing about until disaster strikes.

What Exactly Is the Proflo PFXT5I Expansion Tank?

The Proflo PFXT5I expansion tank is essentially a safety device for your home’s plumbing system. It’s a small tank (typically 2-5 gallons) that provides a space for water to expand when it’s heated. This might sound simple, but it’s actually solving a complex physics problem happening in your plumbing system every day.

When water heats up, it expands—this is basic thermodynamics. In an open plumbing system (increasingly rare these days), this expanding water would simply push back into the municipal water supply. However, most modern homes have closed systems with check valves or pressure-reducing valves that prevent this backflow.

Without an expansion tank, the expanding water has nowhere to go, creating potentially dangerous pressure that can damage your plumbing fixtures, pipes, and water heater.

The PFXT5I features a diaphragm design that separates the tank into two chambers—one for water and one for air. When water heats and expands, it pushes into the tank, compressing the air chamber. When hot water is used and cold water refills the water heater, the compressed air pushes the water back into the system.

PFXT5I vs. PFXT5: Understanding the Difference

During my research, I discovered there’s often confusion between the Proflo PFXT5I and the PFXT5 models. While they may look similar at first glance, there are crucial differences that might affect your decision.

The “I” in PFXT5I stands for “inline,” meaning this model is designed specifically for inline installation, typically on the cold water supply line to your water heater. The standard PFXT5, on the other hand, is designed for more traditional installation methods.

The PFXT5I features:

• An inline design optimized for vertical installation
• Pre-charged air pressure (typically 40 PSI)
• A butyl diaphragm for better longevity
• Higher maximum pressure rating

For most residential applications, especially if you’re doing the installation yourself, the PFXT5I is often the more convenient choice due to its installation versatility and higher pressure tolerance.

Technical Specifications: Getting to Know Your PFXT5I

When I was shopping for my expansion tank, I found that understanding the specifications helped me make a more informed decision. Here are the key specifications for the Proflo PFXT5I:

• Capacity: 2.1 gallons (7.9 liters)
• Dimensions: Approximately 8 inches in diameter, 11.5 inches in height
• Maximum working pressure: 150 PSI
• Temperature range: 35°F to 150°F (1.7°C to 65.6°C)
• Pre-charged pressure: Typically 40 PSI (may vary)
• Connection size: 3/4″ NPT male thread
• Shell material: Heavy-gauge steel with exterior powder coating
• Interior lining: Polypropylene or butyl, food-grade
• Diaphragm material: Heavy-duty butyl rubber
• Certification: ANSI/NSF 61 certified for potable water use

The 2.1-gallon capacity makes the PFXT5I suitable for water heaters up to approximately 50 gallons, which covers most residential applications. For larger water heaters, you might need to consider a larger expansion tank model.

Is the PFXT5I Right for Your System?

Before purchasing any expansion tank, it’s crucial to determine if your system actually needs one. I learned this the hard way after initially buying the wrong size for my system.

You likely need an expansion tank if:

1. Your home has a “closed” plumbing system, typically indicated by:
   • A pressure reducing valve
   • A backflow preventer
   • A check valve on the water meter or main line
2. Your water heater is relatively new (post-2006) as newer models often require expansion tanks to maintain warranty coverage
3. You’re experiencing any of these symptoms:
   • Dripping temperature and pressure (T&P) relief valve on your water heater
   • Unusual banging or hammering in pipes (water hammer)
   • Fluctuating water pressure when using hot water
   • Premature failure of washing machine hoses, dishwasher components, or faucets

In my case, I had a pressure reducing valve installed the previous year, which created a closed system. No one told me I needed to add an expansion tank afterward—a costly oversight!

Installation Guide: Setting Up Your PFXT5I

When my expansion tank arrived, I was surprised by how straightforward the installation process seemed. While I ultimately hired a professional (plumbing isn’t my forte), I learned that many homeowners with basic plumbing knowledge successfully install these themselves.

Here’s a step-by-step installation guide:

Tools and Materials You’ll Need:

• Proflo PFXT5I expansion tank
• Pipe wrench or adjustable wrench
• Teflon tape or pipe thread compound
• Pressure gauge (to check home water pressure)
• Tire pressure gauge (to check and adjust tank pre-charge)
• Bike pump or compressor (if pre-charge adjustment is needed)
• T-fitting or tee connector (if not present in your system)
• Shut-off valve (recommended)
• Pipe cutter (if modifications to existing plumbing are needed)

Installation Steps:

1. Turn off water and power: Before doing anything, shut off the water supply to your water heater and turn off the power (for electric) or gas supply.
2. Drain some water: Open a hot water faucet and drain a few gallons from the water heater to reduce pressure.
3. Check the pre-charge: Use a tire pressure gauge on the air valve of the expansion tank. The pre-charge should match your home’s water pressure (typically between 40-60 PSI). Adjust if necessary.
4. Find the installation location: The PFXT5I should be installed on the cold water supply line to the water heater, ideally within 3-5 feet of the water heater.
5. Install a tee fitting: If one isn’t already present, you’ll need to cut the cold water pipe and install a tee fitting.
6. Apply thread sealant: Use Teflon tape or pipe thread compound on the connection threads.
7. Connect the tank: Screw the expansion tank into the tee fitting. The PFXT5I is designed to be supported by the piping, but additional support is recommended for longevity.
8. Restore water and power: Turn the water supply back on, check for leaks, then restore power to the water heater.

The entire installation typically takes 1-2 hours, depending on your plumbing configuration and experience level.

Proper Maintenance: Ensuring Longevity

One aspect of expansion tank ownership that surprised me was the need for regular maintenance. When properly maintained, a quality expansion tank like the PFXT5I can last 5-10 years.

Here’s the maintenance schedule I follow:

Every 6 Months:

1. Check for visible issues: Look for signs of corrosion, leaking, or improper mounting
2. Test the pre-charge pressure: Turn off water, drain pressure from the tank by opening a faucet, then check the air pressure with a tire gauge
3. Adjust pressure if needed: Use a bicycle pump or compressor to add air if the pressure is low

Annually:

1. Check water quality: Hard water can reduce tank life; consider a water softener if hardness is high
2. Inspect connections: Ensure all connections remain tight and leak-free
3. Check tank weight: A waterlogged tank (indicating diaphragm failure) will feel unusually heavy

Signs Your Expansion Tank May Be Failing:

• Water leaking from the air valve or around the tank
• Tank feels full of water when you tap different areas (should have different sounds between air and water sides)
• T&P valve on water heater activates frequently
• Return of water hammer or pressure issues
• Visible corrosion or rust on tank exterior

I’ve set calendar reminders for these checks—it’s much cheaper than dealing with water heater damage!

Material Composition: What’s Inside the PFXT5I?

The PFXT5I’s construction is specifically designed for durability and water safety. The exterior features a heavy-gauge steel shell with a powder-coated finish to prevent rust and corrosion. Inside, you’ll find a butyl rubber diaphragm that separates the air and water chambers.

What impressed me about the PFXT5I is that its interior water chamber is lined with a FDA-approved, food-grade material that prevents contamination of your drinking water. This is crucial since the tank is connected to your potable water supply.

The air valve (similar to those on car tires) is typically made of brass or stainless steel for durability. The connection fitting is brass, which provides a reliable, corrosion-resistant connection to your plumbing system.

All these materials are selected to provide a long service life while maintaining water safety—important considerations for any component in your drinking water system.

Residential vs. Commercial Applications

While I purchased my PFXT5I for my home, I was curious about its suitability for commercial applications. Through my research, I discovered that the PFXT5I is primarily designed for residential use, specifically for systems with water heaters up to about 50 gallons.

For commercial applications, larger expansion tanks with higher capacities are typically required. However, smaller commercial settings with residential-sized water heaters might find the PFXT5I suitable.

If you’re considering the PFXT5I for a commercial property, I’d recommend consulting with a professional plumber who can assess your specific needs and water usage patterns. Commercial applications often have different code requirements and usage patterns that might necessitate a different expansion tank solution.

Warranty Coverage: Protecting Your Investment

The Proflo PFXT5I typically comes with a 5-year limited warranty, which is fairly standard in the industry. This warranty generally covers defects in materials and workmanship under normal use conditions.

From my experience reading the fine print (always do this!), here are some key points about the warranty:

• It usually doesn’t cover improper installation, abuse, or normal wear
• You’ll need proof of purchase for warranty claims
• Some warranty terms require professional installation
• The warranty typically isn’t transferable to subsequent homeowners

To maintain warranty coverage, be sure to follow the installation instructions carefully and keep your receipt in a safe place. I’ve scanned mine and stored it with my other home maintenance documents.

How the PFXT5I Prevents Water Heater Damage

The relationship between your expansion tank and water heater is crucial to understand. Without getting too technical, a properly functioning expansion tank like the PFXT5I is essential for preventing premature water heater failure and extending the lifespan of your entire plumbing system.

Here’s how it protects your investment:

1. Prevents excessive pressure: Without an expansion tank, thermal expansion can create pressures exceeding 150 PSI in your system—far above the 50-70 PSI most systems are designed for.
2. Protects the pressure relief valve: The temperature and pressure relief valve on your water heater is a last-resort safety device. Without an expansion tank, this valve activates frequently, leading to premature wear and potential failure.
3. Reduces stress on tank seams: Constant pressure fluctuations stress the seams and welds on your water heater tank, potentially causing leaks.
4. Preserves internal components: Excessive pressure can damage internal components like the dip tube, anode rod, and heating elements.
5. Maintains warranty coverage: Many water heater manufacturers now require expansion tanks in closed systems to maintain warranty coverage.

I was shocked to learn that a $150 expansion tank could have prevented my $1,200 water heater repair. That’s a lesson I won’t soon forget!

Consumer Reviews: What Others Are Saying

Before purchasing my PFXT5I, I spent considerable time reading reviews from other homeowners. The consensus was largely positive, with most users reporting trouble-free operation for years.

Common praise points included:

• Straightforward installation
• Solid construction quality
• Effective pressure regulation
• Good value compared to premium brands

Some criticism centered around:

• Pre-charge sometimes needing adjustment before installation
• Limited installation instructions in the box
• Occasional issues with the air valve quality

Overall, the PFXT5I has maintained a solid 4.5/5 star rating across most retail platforms I checked, which gave me confidence in my purchase decision.

Water Hammer Reduction: An Added Benefit

An unexpected benefit I discovered after installing my PFXT5I was the reduction in water hammer—that annoying banging sound in pipes when you quickly shut off a faucet or when appliances like washing machines change cycles.

Water hammer occurs when moving water suddenly stops, creating a pressure wave that slams against pipes and fittings. While dedicated water hammer arrestors are designed specifically for this issue, expansion tanks like the PFXT5I can help mitigate the problem by absorbing some of these pressure fluctuations.

Since installing my expansion tank, I’ve noticed significantly less pipe noise throughout my home. This is because the compressed air in the tank acts as a cushion for pressure waves, reducing their impact on the plumbing system.

If you’re experiencing water hammer issues, an expansion tank might help address both thermal expansion and water hammer with a single installation.

DIY Installation: Is It Right for You?

One of the biggest decisions you’ll face is whether to install the PFXT5I yourself or hire a professional. As someone who considered the DIY route before ultimately hiring a pro, I can offer some perspective.

The installation is straightforward if:

• You have basic plumbing experience
• Your water heater has easily accessible pipes
• You have the necessary tools
• You’re comfortable working with water supply lines
• Your local codes allow DIY plumbing work

You should probably hire a professional if:

• You have no plumbing experience
• Your water heater installation is complex
• You need to modify existing pipes significantly
• Local codes require licensed installation
• You’re uncomfortable working around gas lines (for gas water heaters)

The average professional installation costs between $150-$300, depending on your location and the complexity of your plumbing. While this adds to the overall cost, professional installation often includes proper sizing calculations, system pressure testing, and sometimes an extended warranty.

Price Expectations: What Should You Budget?

The Proflo PFXT5I typically retails between $40-$65, depending on where you purchase it and any ongoing promotions. This places it in the mid-range of expansion tank pricing—not the cheapest option, but far from the most expensive premium brands that can cost $100 or more.

When budgeting for this project, consider these potential additional costs:

• Installation hardware: $15-$30 (tee fittings, shut-off valve, pipe sections)
• Tools (if you don’t own them): $20-$60
• Professional installation: $150-$300
• Water pressure gauge: $10-$15
• Pipe thread sealant: $5-$10

All told, a DIY installation might cost you $80-$120 total, while professional installation typically ranges from $200-$350 all-inclusive.

Given that water heater repairs or replacement can easily cost $1,000-$3,000, this preventative measure represents an excellent return on investment.

Performance Comparison: How Does the PFXT5I Stack Up?

In my research, I compared the PFXT5I with several competing expansion tanks from brands like Watts, Amtrol, and Rheem. Here’s how it compares:

Proflo PFXT5I vs. Watts PLT-5

• Similar capacity and pressure ratings
• Watts typically costs 15-20% more
• Watts offers a slightly longer warranty (7 years vs. 5)
• PFXT5I has better online availability

Proflo PFXT5I vs. Amtrol ST-5

• Amtrol is considered a premium brand with 10+ years in the industry
• Amtrol costs 30-40% more than the PFXT5I
• Amtrol offers a longer warranty (7 years)
• Both have similar performance specifications
• Amtrol claims a thicker diaphragm material

Proflo PFXT5I vs. Rheem SP20060

• Comparable price points
• Similar specifications and warranty
• Rheem has slightly better reviews for longevity
• PFXT5I is more widely available

Overall, the PFXT5I represents an excellent value proposition, offering comparable performance to more expensive brands at a more accessible price point. For most residential applications, the differences in performance are negligible, making the PFXT5I a smart choice for budget-conscious homeowners who don’t want to compromise on quality.

Where to Purchase Your PFXT5I

The Proflo brand is primarily sold through plumbing supply stores and certain retail channels. I found several reliable sources during my shopping:

1. Ferguson Plumbing Supply: As the primary distributor of Proflo products, Ferguson typically has the best availability and competitive pricing.
2. Local plumbing supply stores: Many independent plumbing suppliers carry Proflo products or can order them for you.
3. Online retailers: Several online plumbing supply websites carry the PFXT5I, often with free shipping on orders over a certain amount.
4. Through your plumber: Many plumbers can supply and install the tank as part of their service.

I ultimately purchased mine from my local Ferguson showroom, which allowed me to ask questions and get installation advice from their staff. The price was comparable to online retailers, and I didn’t have to wait for shipping.

Final Thoughts: Is the PFXT5I Right for You?

After living with my PFXT5I expansion tank for over a year now, I can confidently say it was one of the smartest home maintenance investments I’ve made. The peace of mind knowing my plumbing system is properly protected from thermal expansion is well worth the modest cost.

If you’re considering an expansion tank, the PFXT5I deserves serious consideration, especially if:

• You have a closed plumbing system
• Your water heater is 50 gallons or smaller
• You want a balance of quality and value
• You prefer a widely available product with good support

Remember, protecting your plumbing system with an expansion tank isn’t just about preventing inconvenient leaks—it’s about avoiding potentially catastrophic water damage and extending the life of your expensive water heater.

The Proflo PFXT5I may not be the flashiest purchase you’ll make for your home, but it might just be one of the most important for your plumbing system’s health. As someone who learned about expansion tanks the hard way, I hope this guide helps you make an informed decision before you face similar issues.

Have you installed an expansion tank in your home? What was your experience like? I’d love to hear your thoughts and questions in the comments below!