Pressure Tank for Well Pump: Sizing, Cost, and Replacement
A residential well pressure tank typically ranges from $150 to $600 for just the tank; add professional installation and the bill can climb to $300 up to $1,500 based on size and access. A common replacement is a 20-gallon model priced around $250 with a two-hour install. Tank selection is crucial: an undersized unit will make the pump cycle excessively, shortening motor life significantly.
If your pump turns on every few seconds, see our guide on common pressure tank problems to confirm the tank is actually the issue before buying a replacement. For the full pressure system picture, including the switch and gauge, visit our pressure switch and tank guide.
How much does a well pressure tank cost?
| Tank Size | Tank Cost | Installed (DIY) | Installed (Pro) |
|---|---|---|---|
| 20-gallon | $200–$250 | $220–$280 | $400–$700 |
| 32-gallon | $300–$450 | $320–$480 | $600–$1,000 |
| 44-gallon | $400–$600 | $420–$640 | $800–$1,500 |
DIY replacement saves significant money. The only additional materials are Teflon tape ($2), pipe fittings if your existing ones don’t reuse ($10–$30). An air compressor to set the pre-charge. Most homeowners already have those.
Labor costs vary widely by region and accessibility. A tank in an open basement installs faster than one in a crawlspace or pump house with limited access.
How a pressure tank works
Bladder pressure tanks feature dual compartments divided by a rubber diaphragm; one chamber is pre-filled with compressed air, while the other collects water during operation. Failure to maintain proper air pressure can lead to inefficient pumping cycles and wasted energy. Ensure your tank’s initial charge remains intact to optimize performance.
When the pump reaches cut-out pressure (say, 50 PSI on a 30/50 system), it shuts off. The compressed air in the tank pushes water out to the house until pressure drops to the cut-in value (30 PSI), at which point the pump starts again. Without the air cushion, pressure would collapse the moment the pump stopped and the pump would cycle constantly.
Worth knowing.
The pre-charge on a bladder pressure tank should be set 2 PSI below the cut-in pressure. For a standard 30/50 system, that means 28 PSI. This pre-charge is set at the factory but can drift over time. Checking it once a year with a tire gauge (through the Schrader valve on top) takes about two minutes.
For private well maintenance fundamentals, the EPA private well maintenance{:target=“_blank”} resource covers annual inspection schedules including pressure tank testing.
Video guide
Video: “Well Pressure Tank: How it Works and How a Tank Gets Waterlogged” by Wendell Lee Well Services
Choosing the right tank size
Bigger is generally better for pressure tanks. A larger tank stores more pressurized water. This means the pump cycles less often and lasts longer. The rule of thumb: match tank size to pump flow rate and household demand.
| Household Size | Pump Flow Rate | Recommended Tank |
|---|---|---|
| 1–2 people | 5–10 GPM | 20-gallon |
| 3–4 people | 10–15 GPM | 32-gallon |
| 5+ people | 15–20 GPM | 44-gallon or larger |
These are starting points. A household with irrigation, a hot tub, or a livestock watering system needs to size up. If you want to do the math precisely, accounting for pump GPM, acceptable cycle rate, and draw-down volume, see our detailed sizing your pressure tank guide.
A 32-gallon tank suits a 1 HP pump, minimizing wear; running a 1 HP on a mere 20-gallon setup forces it to cycle 6 to 8 times hourly under normal use, accelerating motor fatigue.
Top pressure tank brands
We’ve looked at the most commonly installed tanks across r/homeimprovement discussions and contractor recommendations:
| Brand | Model | Size | Price Range | Notes |
|---|---|---|---|---|
| Well-X-Trol | WX-202 | 20 gal | $200–$250 | Industry standard. Butyl bladder; 5-year warranty |
| Well-X-Trol | WX-203 | 32 gal | $320–$400 | Same bladder quality. Most popular mid-size |
| Flotec | FP7110T | 19 gal | $180–$220 | Budget option. Good for lower-demand applications |
| AquaMotion | Various | 14–119 gal | $150–$600 | Broad range. Commercial-grade bladder on larger sizes |
Well-X-Trol (made by Amtrol) is the tank we see most often in professional installations. For full specifications on sizing and installation, Well-X-Trol specifications{:target=“_blank”} are published by Amtrol for each model.
Flotec is the common choice at big-box stores and works fine for light-demand applications. We’d avoid discount no-name tanks; the bladder quality varies and failure rates are higher.
DIY replacement steps
Replacing a pressure tank is a manageable DIY project for most homeowners. The main requirements: you need to shut off water to the system (not just the pressure). You need an air compressor to set the new tank’s pre-charge.
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Turn off power at the breaker. The pump must not run while you’re disconnecting plumbing.
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Drain the system. Open the lowest faucet in the house and let pressure bleed down completely. Confirm the gauge reads zero before proceeding.
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Disconnect the plumbing connections. Most tanks connect via a single threaded fitting on the bottom (or side). Use a pipe wrench. Have towels ready; residual water will drain when you disconnect.
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Remove the old tank. Smaller tanks are one-person jobs; 44-gallon tanks weigh 40–50 lbs empty and need a helper or hand truck.
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Set the pre-charge on the new tank. The factory pre-charge is typically 30 PSI. Set it to 2 PSI below your cut-in pressure using an air compressor and tire gauge through the Schrader valve on top. For a 30/50 system, set it to 28 PSI.
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Connect the new tank with Teflon tape on the threads. Wrap the male threads 3–4 times clockwise with Teflon tape before threading in. Hand-tighten, then snug with a wrench. Don’t overtighten.
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Close the drain faucet. Restore power.
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Check for leaks. Let the system pressurize fully, then run a faucet and watch the connection point for drips. Check again after 24 hours.
Signs you need a new tank
Most bladder tanks last 10–15 years. These are the clear signals that yours has failed:
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Pressure pulses at faucets: the faucet delivers good pressure, drops, recovers, drops again in a rhythm. This surge pattern means the tank has no air buffer.
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Pump short cycles every 5–10 seconds. This is the most common symptom. The pump turns on, runs briefly, turns off, then repeats. Every short cycle stresses the motor start windings. If you hear the pump clicking on and off rapidly, check the tank immediately. See our pump short cycling guide if you’re not sure this is the issue.
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Tank feels top-heavy or won’t rock. Push the top of the tank gently. A healthy tank with an air pocket will rock slightly. A tank that’s stiff and won’t budge is full of water. The air is gone.
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Water sprays from the Schrader valve. Press the air valve on top. If water sprays out instead of air, the bladder has ruptured. That tank can’t be repaired.
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Rust or corrosion on the tank exterior: surface rust is cosmetic, but corrosion at welds, fittings, or the bottom of the tank signals structural compromise. Replace before it leaks.
A waterlogged pressure tank can’t be repaired. Once the bladder ruptures, the only fix is replacement. We’ve seen homeowners try re-inflating a waterlogged tank. It works briefly but the bladder won’t seal again.
Don’t skip this.
FAQ
How long does a well pressure tank last?
Bladder-style pressure tanks typically last 10–15 years under normal residential use. Factors that shorten lifespan: high pump cycling frequency (from an undersized tank), water with high mineral content, or installation in a humid space prone to exterior corrosion. We recommend checking the Schrader valve air pressure annually. Catching a slow air leak early can extend tank life.
Can a waterlogged pressure tank be repaired?
No. Once the internal bladder ruptures, water fills the entire tank and there’s no air cushion. The only fix is replacement. Some homeowners try draining the tank and re-pressurizing through the Schrader valve. The pump may cycle correctly for a few days. But the ruptured bladder won’t seal and the waterlogging returns.
What size pressure tank do I need for a 1 HP pump?
A 32-gallon tank is the minimum we recommend for a 1 HP pump. A 1 HP submersible typically delivers 10–15 GPM. Pairing it with a 20-gallon tank results in too-frequent cycling, 6–8 starts per hour under moderate demand, which stresses the motor start windings. Going to 32 gallons reduces cycling to a comfortable 2–4 starts per hour.
Should I get a bigger tank than I need?
Yes. A larger tank reduces pump cycling frequency, which directly extends pump motor life. The cost difference between a 20-gallon and a 32-gallon tank is usually $80–$120. Over a 10–15 year tank lifespan, that difference is insignificant compared to avoiding a premature pump failure. If your well yield supports it, size up.
Our well pump repair guide covers the full system: pump, pressure switch, tank, and plumbing, with diagnostic steps for each component. If you’re replacing the tank because of chronic short cycling, also check pump short cycling to confirm the tank was the root cause.