Proflo Pfxt5

From Frustrated Homeowner to Plumbing Enthusiast: My Journey with the PFXT5

When I first heard that strange banging noise in my pipes, I had no idea I was about to embark on a deep dive into the world of residential plumbing systems. Three years and countless YouTube tutorials later, I’m sharing everything I’ve learned about one of the most overlooked yet critical components in your home’s water system: the expansion tank. Specifically, the Proflo PFXT5 expansion tank that saved my sanity (and my pipes). If you’re experiencing mysterious plumbing issues or just want to prevent future headaches, understanding expansion tanks could save you thousands in potential water damage and repairs.

Let me walk you through everything you need to know about this unsung hero of home plumbing systems.

What Exactly Is a Proflo PFXT5 Expansion Tank and Why Should You Care?

Remember basic physics from high school? Water expands when heated—it’s simple science that can cause complicated problems in your home. When your water heater fires up, the water inside expands, increasing pressure throughout your closed plumbing system. Without somewhere for that pressure to go, you’re looking at potential damage to pipes, fixtures, and even the water heater itself.

Enter the Proflo PFXT5 expansion tank—a small but mighty device that provides a cushion for that expanding water. I like to think of it as a pressure relief valve for your entire plumbing system.

The PFXT5 is essentially a small tank divided into two sections by a rubber diaphragm. One side contains air (pre-charged at the factory), while the other side connects to your water system. When water heats up and expands, it pushes against the diaphragm, compressing the air chamber instead of stressing your pipes.

I installed mine three years ago after experiencing that telltale “water hammer” sound—loud banging in the pipes that nearly gave me a heart attack the first time I heard it at 2 AM. Since then? Blissful silence and consistent water pressure throughout my home.

The Technical Specifications You Should Know

Before diving into your purchase, let’s break down what makes the Proflo PFXT5 tick:

• Capacity: 2.1 gallons (7.9 liters)
• Maximum working pressure: 150 PSI
• Pre-charge pressure: 40 PSI (adjustable based on your system needs)
• Temperature range: 35°F to 200°F (1.7°C to 93.3°C)
• Connection size: 3/4″ MNPT (Male National Pipe Thread)
• Dimensions: Approximately 8″ diameter by 12.5″ height
• Material: Steel tank with butyl rubber diaphragm
• Exterior finish: Baked-on enamel for corrosion resistance
• Weight: Approximately 6 pounds (2.7 kg)

What impressed me most about these specs is the temperature range. My garage, where my water heater lives, gets pretty cold in winter and can be a sauna in summer. The PFXT5 handles these fluctuations without complaint, maintaining its function regardless of ambient conditions.

Do You Actually Need an Expansion Tank?

When I first started researching plumbing issues, I wasn’t sure if an expansion tank was necessary or just an optional upgrade. Here’s what I discovered: if you have a “closed” plumbing system, an expansion tank isn’t optional—it’s essential.

How do you know if your system is “closed”? Most modern homes are, especially if you have:

• A pressure reducing valve (PRV)
• A backflow preventer
• A check valve
• Recent plumbing code compliance updates

I discovered my system was closed when I noticed my water pressure gauge fluctuating dramatically between cold water (about 60 PSI) and after the water heater had been running (spiking to nearly 100 PSI). That’s a clear sign you need an expansion tank.

Additionally, most current plumbing codes require expansion tanks on new water heater installations. When I replaced my water heater last year, the inspector specifically checked for the expansion tank before approving the installation.

Some signs you might need an expansion tank include:

• Dripping T&P (temperature and pressure) relief valve on your water heater
• Mysterious leaks in fixtures throughout your home
• Water pressure that varies dramatically
• That distinctive “hammering” sound in your pipes
• Shortened lifespan of water heaters or fixtures

If you’re experiencing any of these issues, investing in a Proflo PFXT5 expansion tank could solve multiple problems with one simple installation.

Installation Guide: Easier Than I Expected

I’ll be honest—I was intimidated by the installation process. I’m handy, but plumbing always seemed like something best left to professionals. After getting quotes ranging from $200-350 for installation (on top of the tank cost), I decided to try it myself. The entire process took less than two hours, and most of that was running to the hardware store for a missing fitting.

Here’s my step-by-step guide based on my experience:

What You’ll Need:

• Proflo PFXT5 expansion tank
• Teflon tape
• Pipe wrench or large adjustable wrench
• Tire pressure gauge
• Bicycle pump or compressor (if adjustment needed)
• Tee fitting (if not already in your system)
• Shut-off valve (recommended)

Installation Steps:

1. Turn off the power to your water heater. This is crucial for safety—whether it’s electric (flip the breaker) or gas (turn the gas valve to the pilot position).
2. Shut off the cold water supply to your water heater.
3. Relieve pressure in the system by opening a hot water faucet somewhere in your house.
4. Check the pre-charge pressure in your new PFXT5 tank using a tire pressure gauge on the air valve (similar to a tire valve) on top of the tank. The factory setting is typically 40 PSI, but you’ll want to match it to your home’s water pressure. I adjusted mine to 55 PSI to match my incoming water pressure.
5. Locate the installation point. The ideal location is on the cold water supply line leading to your water heater. I installed mine approximately 18 inches from the water heater using a tee fitting.
6. Apply Teflon tape to the tank’s threaded connection, wrapping it clockwise around the threads 3-4 times.
7. Thread the tank onto the tee fitting and tighten with a wrench. The tank should be installed vertically with the water connection at the bottom. Some people mount them using straps, but I found that the piping adequately supported the tank’s weight.
8. Turn the water supply back on and check for leaks around all connections.
9. Turn the power back on to your water heater.
10. Bleed air from the lines by running hot water at a faucet until it flows smoothly.

The most challenging part for me was getting the right fittings. My house has copper pipes, so I needed to use a dielectric union to prevent galvanic corrosion between the copper pipes and the steel tank connection. It’s these little details that can trip up DIYers, but any good plumbing supply store can help you select the right components.

Maintenance: Simple But Crucial

One thing I’ve learned about expansion tanks is that they’re not “install and forget” devices. Proper maintenance ensures they’ll last their full expected lifespan of 5-7 years. Here’s my maintenance routine:

Quarterly Checks:

1. Check the air pressure using a tire gauge. I do this when the system is cold and after shutting off the water heater and relieving water pressure (by opening a faucet). The pressure should match your incoming water pressure.
2. Inspect for leaks or corrosion around the connection point. A small amount of white mineral buildup might be normal, but actual water dripping requires immediate attention.
3. Tap the tank lightly and listen for water sloshing. A properly functioning tank should sound somewhat hollow. If it sounds full of water, the diaphragm may have failed.

Annual Maintenance:

1. Drain the water heater as recommended by the manufacturer (usually annually) which helps clear sediment and allows you to thoroughly check the expansion tank.
2. Adjust the pressure if needed. Over time, tanks can lose some pressure. I typically find mine drops about 2-3 PSI per year.
3. Verify the tank is properly secured. Vibrations over time can loosen mounting hardware if you’ve used any.

When I first installed my PFXT5, I set a quarterly reminder on my phone. It might seem excessive, but these quick five-minute checks have caught minor issues before they became major problems.

Troubleshooting Common Issues

Even the best expansion tanks can develop problems. Here are some issues I’ve either experienced personally or learned about from fellow homeowners:

Tank Feels Heavy or Full of Water

This usually indicates a ruptured diaphragm inside the tank. When this happens, water fills the air chamber, rendering the tank ineffective. Unfortunately, there’s no fix—you’ll need to replace the tank. I learned this the hard way when helping a neighbor diagnose their persistent plumbing issues.

Water Leaking from the Air Valve

This is another sign of diaphragm failure. If water comes out when you press the valve stem (like you would when checking tire pressure), the diaphragm has likely failed and allowed water into the air chamber.

Corrosion at Connection Point

This could indicate electrolysis between dissimilar metals. If you notice this, you might need to install or replace a dielectric union. I saw this beginning to happen on my first installation attempt before I realized I needed that dielectric union.

System Still Has Pressure Issues Despite Tank

This could mean your tank is undersized for your system, improperly charged, or installed incorrectly. The PFXT5’s 2.1-gallon capacity is suitable for water heaters up to 50 gallons in most residential applications. For larger tanks or systems with exceptionally high pressure, you might need to move up to a larger expansion tank model.

Persistent Water Hammer Despite Tank Installation

In my case, this was solved by adding pipe insulation and securing loose pipes in my walls. Sometimes water hammer isn’t just about pressure but also about pipe movement. The expansion tank addresses the pressure issues, but securing loose pipes might be necessary to completely eliminate noise.

Where to Buy the Proflo PFXT5 and What to Expect Price-wise

When I was shopping for my expansion tank, I was surprised by the price variation for essentially the same product. Here’s what I found:

• Big box home improvement stores (Home Depot, Lowe’s): $35-45, often in stock
• Plumbing supply stores: $40-60, with better selection and knowledgeable staff
• Online retailers (Amazon, eBay): $30-50, but watch for shipping costs
• Direct from manufacturer/supplier: Usually requires purchasing through a contractor

I ultimately purchased mine from a local plumbing supply store for $42. While it was about $8 more than the big box store price, the advice I received from their staff was worth the premium. They helped me identify the correct fittings needed for my specific installation, which saved me multiple trips back and forth.

As of my last check (early 2025), prices have remained relatively stable for the PFXT5 model. However, like most products with steel components, prices can fluctuate based on steel market conditions.

How the PFXT5 Compares to Competitors

The expansion tank market has several major players, and I researched them all before making my decision. Here’s how the Proflo PFXT5 stacks up against the competition:

Amtrol Therm-X-Trol ST-5

• Similar capacity (2 gallons)
• Generally $10-15 more expensive
• Possibly better internal construction (claimed longer lifespan)
• More established brand name

Watts PLT-5

• Nearly identical specifications
• Similar price point
• More widely available
• Slightly different connection design

Reliance Thermal Expansion Tank

• Budget option (often $5-10 less)
• Mixed reviews on longevity
• Same basic functionality

After comparing these options, I chose the Proflo PFXT5 for its balance of affordability, availability, and reputation. Three years in, I’m satisfied with my choice. The tank has maintained pressure perfectly and shows no signs of deterioration.

What I’ve noticed in forums and talking with plumbers is that most expansion tanks in this size range perform similarly. The key differences tend to be in warranty coverage and materials quality, which affects longevity. The PFXT5 comes with a one-year warranty, which is standard for the industry but admittedly on the short side for a component that should last 5+ years.

Is the Proflo PFXT5 Certified and Code Compliant?

This was a major concern for me as a DIYer—I didn’t want to install something that would cause issues during home inspections or with insurance. The good news is that the Proflo PFXT5 meets all relevant plumbing codes and certifications:

• ANSI/NSF 61 certified (safe for drinking water)
• ASME certified (meets pressure vessel safety standards)
• Compliant with Uniform Plumbing Code (UPC)
• Meets International Plumbing Code (IPC) requirements

These certifications are important not just for code compliance but also for safety. Expansion tanks are, after all, pressure vessels in your home. The PFXT5’s compliance with ASME standards means it’s been tested to withstand pressures well beyond what your residential system should ever reach.

When my city inspector came to check some other plumbing work last year, he specifically noted the expansion tank installation and commented that it was properly installed and an appropriate model for residential use. That validation was reassuring.

Real-World Performance and User Reviews

Before purchasing, I scoured online reviews and plumbing forums. The PFXT5 generally received positive feedback, with most complaints centered around installation challenges rather than product performance.

After three years with my own PFXT5, I can offer my personal assessment:

Pros:

• Completely eliminated pressure spikes in my system
• Stopped the mysterious dripping of my bathroom faucet (which was pressure-related)
• No water hammer issues since installation
• Has maintained its pressure charge consistently
• Compact size fits well in my tight utility closet

Cons:

• The factory pre-charge was off by about 5 PSI (easy to adjust but worth checking)
• The finish scratches relatively easily during installation
• Limited warranty (only 1 year)
• Connection point showed very slight corrosion after about 2 years (likely due to my hard water)

Most online reviews I’ve seen mirror my experience, with satisfaction rates typically around 4.3-4.5 out of 5 stars. The most common complaints involve either installation difficulties (usually due to space constraints) or premature failure (typically within 3-4 years rather than the expected 5-7).

Water Hammer Issues: Can the PFXT5 Really Help?

One of the most common reasons homeowners investigate expansion tanks is to address water hammer—that startling banging noise in pipes that often occurs when you shut off a faucet quickly or when valves close in appliances like washing machines.

In my experience, the PFXT5 dramatically reduced but didn’t completely eliminate water hammer in my home. Here’s why: water hammer has two main causes:

1. Pressure fluctuations – which the expansion tank directly addresses
2. Physical movement of pipes – which requires additional solutions like pipe strapping

After installing the PFXT5, my major water hammer issues disappeared. However, I still occasionally heard minor “ticks” when the washing machine valve closed. This was solved by adding additional pipe strapping in my walls to secure the pipes more firmly.

If water hammer is your primary concern, an expansion tank like the PFXT5 should be your first solution, but it might need to be complemented with additional pipe securing measures for complete silence.

The Long-Term Investment: Is It Worth It?

When considering the approximately $40-50 price tag of the PFXT5, plus installation materials (another $15-20 if doing it yourself), the question becomes: Is it worth it?

Based on my experience, the answer is an emphatic yes. Here’s my cost-benefit analysis:

Costs:

• Tank: $42
• Installation materials: $18
• My time: 2 hours
• Total: About $60 (excluding my time)

Benefits:

• Extended water heater life (potentially saving $800-1,200 in premature replacement)
• Prevented potential pipe damage (repairs could run $150-500+)
• Eliminated faucet dripping (saving on water bills and preventing fixture damage)
• Peace of mind knowing my plumbing system is properly protected
• Code compliance for future home sales

The math is clear—even if the tank only prevents one minor plumbing issue, it has paid for itself. Considering that water damage is one of the most common and costly home insurance claims, the protection an expansion tank provides is invaluable.

I view my PFXT5 as cheap insurance for my entire plumbing system. Even if you hire a professional for installation (typically $150-300), the long-term benefits outweigh this upfront cost.

Expected Lifespan and When to Replace

No expansion tank lasts forever. The rubber diaphragm inside will eventually degrade, especially in systems with chlorinated water. Based on manufacturer data and plumber recommendations, you should expect 5-7 years from a properly installed and maintained PFXT5.

Signs that it’s time for replacement include:

• Inability to hold air pressure
• Water coming from the air valve
• Tank feeling unusually heavy
• Return of pressure-related issues in your plumbing system
• Visible corrosion or leaks

I’m currently at the three-year mark with my PFXT5 and it’s performing flawlessly. I’ve already budgeted for replacement around the 6-year mark as preventative maintenance, even if it’s still functioning. Given the potential consequences of failure, this seems like a reasonable approach.

Final Thoughts: Why Every Homeowner Should Consider the PFXT5

After living with the Proflo PFXT5 expansion tank for three years and extensively researching plumbing systems, I’ve become something of an unwitting expansion tank evangelist among my friends and family. Here’s my closing argument for why you should consider one for your home:

1. Protection for your entire plumbing system – The modest investment protects everything from your water heater to your fixtures.
2. Energy efficiency – By reducing pressure strain on your water heater, it can operate more efficiently.
3. Extended equipment life – Water heaters, fixtures, and valves all last longer when not subjected to excessive pressure.
4. Peace and quiet – No more startling pipe bangs in the middle of the night.
5. Code compliance – Most modern plumbing codes require expansion tanks, so you’re bringing your system up to current standards.
6. DIY-friendly – Even with minimal plumbing experience, this is a manageable weekend project.
7. Immediate results – Unlike many home improvements, you’ll notice the difference right away.

In my journey from plumbing novice to moderately informed homeowner, installing the PFXT5 expansion tank has been one of the most satisfying and impactful projects I’ve undertaken. Whether you’re experiencing plumbing issues now or simply want to prevent them in the future, a quality expansion tank like the Proflo PFXT5 is one of the most cost-effective improvements you can make to your home’s plumbing system.

If you’re on the fence, I hope my experience helps you make an informed decision. Your pipes (and your peace of mind) will thank you.