Used Inogen Portable Oxygen Concentrators
Used Portable Oxygen Concentrators | Main Clinic Supply
Used Inogen Portable Oxygen Concentrators
Complete Buyer's Guide: Rove 6, Rove 4, G5, G4, and G3. What They're Worth, What to Inspect, and How to Buy with Confidence
Fast Facts: Buying a Used Inogen Concentrator
- Models available used: Inogen Rove 6, Rove 4, One G5, One G4, and One G3 are all commonly sold on the secondary market.
- Used Rove 6 price range: $1,200 to $1,600 for an inspected unit (new MSRP: ~$2,895).
- Used G5 price range: $900 to $1,400 for an inspected unit (new MSRP: ~$2,495).
- Sieve bed lifespan: Approximately 3,000 to 4,000 operating hours. Replacement cost: $300 to $500 depending on model.
- Biggest used market risk: Sieve bed degradation that is not visible but results in oxygen output below prescription level.
- Inogen warranty: Does not transfer to second owners on privately sold units.
- FAA in-flight use: All current Inogen models meet FAA acceptance criteria, provided the unit is in proper working order.
- MCS advantage: Every used Inogen sold by Main Clinic Supply is inspected by factory-trained technicians at our Rochester, Minnesota service center before sale.
A used Inogen portable oxygen concentrator can be a smart purchase, or a costly mistake. The difference almost always comes down to one thing: whether anyone actually verified what the machine is delivering before you handed over your money. In 14 years of selling, servicing, and buying back Inogen concentrators, our team has seen thousands of units change hands. The private market is full of devices listed at strong prices with no documentation of what's happening inside the machine where it counts.
This guide covers every used Inogen model available on the secondary market today: the Rove 6, Rove 4, One G5, One G4, and One G3. We'll tell you what each model is worth, what to ask before buying, what our technicians look for in an inspection, and how to think through whether used is the right choice for your situation. If you have questions that the guide doesn't answer, our oxygen specialists are available at 1-800-775-0942 and are happy to walk you through your specific needs.
Is Buying a Used Inogen Concentrator Safe?
The short answer is yes, with the right verification in place. Inogen concentrators are durable devices built to run for years under daily use. The mechanical question isn't whether they work. It's whether they're still delivering your prescribed oxygen level when you breathe.
This is where sieve beds become the central issue. Sieve beds are the zeolite-filled columns inside every portable oxygen concentrator that separate oxygen from room air. They wear out gradually over time, and their degradation is invisible from the outside. A used Inogen can look perfect, charge normally, run quietly, and display all the right indicator lights while delivering oxygen output that has dropped meaningfully below specification.
Beyond the sieve beds, battery capacity degrades with charge cycles. A unit that was sold with a "good battery" may hold 60% to 70% of its original capacity, meaning published battery life figures no longer apply. These are not reasons to avoid used equipment. They are reasons to understand exactly what you're buying and to insist on documentation.
Used Inogen Models at a Glance
Five Inogen models appear regularly on the secondary market. Understanding what each one is built for helps you determine whether a used unit matches your actual prescription and lifestyle, not just your budget.
Inogen Rove 6
Used: $1,200 – $1,700
The current generation flagship. LCD digital display, flow settings 1 through 6, approximately 4.7 lbs with single battery. The most capable and most current used Inogen available.
View Rove 6 Details →Inogen Rove 4
Used: $1,000 – $1,895
Compact and lightweight at approximately 3 lbs. Flow settings 1 through 4. Well suited for active users with lower flow requirements. Smaller physical footprint than the Rove 6.
View Rove 4 Details →Inogen One G5
Used: $900 – $1,495
The predecessor to the Rove line. Flow settings 1 through 6, monochrome display. Comparable clinical performance to the Rove 6 at a lower price point. Strong track record of durability.
View G5 Details →Inogen One G4
Used: $600 – $1,495
The smallest and lightest Inogen ever made at 2.8 lbs. Flow settings 1 through 3 only. Best suited for lower-flow patients who prioritize portability above all else. Not appropriate for flow settings 4 through 6.
View G4 Details →What Used Inogen Concentrators Actually Cost
Pricing on the used Inogen market is inconsistent, and private sellers frequently list at prices that do not reflect condition. The ranges below reflect fair market value for units that have been professionally inspected and are confirmed to be performing to specification. Private sales with no inspection documentation should be priced at the lower end of these ranges at minimum to account for unknown sieve bed and battery condition.
| Model | New MSRP | Used (Inspected) | Used (Private / Uninspected) | Sieve Bed Replacement Cost |
|---|---|---|---|---|
| Inogen Rove 6 | ~$2,895 | $1,200 – $1,700 | $800 – $1,600 | ~$400 – $500 |
| Inogen Rove 4 | ~$2,795 | $1,000 – $1,895 | $600 – $1,200 | ~$350 – $450 |
| Inogen One G5 | ~$2,495 | $900 – $1,495 | $600 – $1,200 | ~$350 – $450 |
| Inogen One G4 | ~$1,895 | $1,000 – $1,295 | $400 – $800 | ~$300 – $380 |
| Inogen One G3 | Discontinued | $1,000 – $1,495 | $200 – $500 | ~$280 – $350 |
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What to Inspect Before You Buy Any Used Inogen
Whether you're buying from a private seller, an online marketplace, or a dealer, these are the seven things that matter most. Our technicians at the Main Clinic Supply service center in Rochester run this same evaluation on every used unit that comes through our doors before we offer it for sale.
1. Sieve Bed Integrity
This is the single most important factor in a used Inogen evaluation. Sieve beds are rated for approximately 3,000 to 4,000 hours. At 8 hours of use per day, that's 1 to 1.5 years. A unit used more intensively reaches the threshold faster. The only way to verify sieve bed performance is oxygen purity testing with calibrated equipment. Ask for documentation. If none exists, budget for potential sieve bed replacement.
2. Battery Capacity
Inogen batteries degrade with every charge cycle. A battery that reads "fully charged" may hold only 60% to 75% of its original capacity after years of use, meaning the published battery life figures on the manufacturer's spec sheet no longer apply to your unit. Ask how old the battery is and whether it has ever been replaced. A new single battery for most Inogen models typically costs around $400.
3. Operating Hours
Some Inogen models display cumulative operating hours in a service menu. This number tells you how hard the unit has worked. There is no universal "too many hours" threshold, but combined with sieve bed age, it gives you the most complete picture available of the unit's remaining service life.
4. Physical Condition and Filter
Cosmetic wear is generally not a concern. What matters is whether the intake filter is clean and undamaged, the connectors show no corrosion, the power port fits snugly with no wobble, and the carry bag or case (if included) shows no structural damage that could affect portability.
5. Accessories Included
A complete Inogen unit should come with AC power supply, DC car charger, cannula tubing, and the carry case. Replacing missing accessories adds $80 to $150 to the real cost of the purchase.
- Oxygen purity test documentation (must be above 87% per FDA; should be 90%+ for clinical reliability)
- Battery capacity test (ideally 80% or more of original rated capacity)
- Approximate operating hours
- Sieve bed replacement history
- Physical inspection of filter, connectors, and power port
- All standard accessories present and functional
- Unit powers on, cycles correctly through flow settings, and alarms function
Questions About a Specific Unit?
Our oxygen specialists can help you evaluate any used Inogen before you buy, or walk you through the inventory we have on hand with full inspection documentation.
Call 1-800-775-0942Monday – Sunday | Rochester, Minnesota
The Main Clinic Supply Difference
Main Clinic Supply operates a dedicated service center in Rochester, Minnesota, staffed by factory-trained POC technicians with over 14 years of hands-on experience across every major Inogen platform. When a used Inogen comes into our facility, it goes through the same diagnostic process our technicians use for warranty service before we offer it for sale.
That process includes oxygen output verification at every flow setting, sieve bed integrity assessment, battery capacity testing, and a complete functional review of all controls, alarms, and displays. Units that don't pass our inspection are either serviced to meet our standards or not sold. We don't list units and hope for the best.
This matters because oxygen is a medical therapy, not a consumer appliance. A device that appears to be working can still be under-delivering without any visible indication. Our technicians catch that before it becomes your problem after purchase.
Private Sale vs. Dealer Purchase: What Actually Changes
The private used Inogen market on Facebook Marketplace, Craigslist, and eBay has grown substantially. Prices are often lower on paper. Here is what you give up in exchange for that lower sticker price.
What a private sale typically includes
A device the seller believes to be working, in the condition the seller has observed, with no third-party verification of oxygen output or sieve bed integrity. The seller is usually a patient or family member, not a technician. They may be honest and accurate in their description while still being genuinely unaware of degraded performance inside the unit.
What a dealer inspection adds
Verified oxygen purity at each flow setting. Battery capacity tested against original specification. Sieve bed assessment by someone who has run this test on thousands of units. Documentation you can reference. And in MCS's case, a team you can call after the purchase if anything comes up.
Used Inogen Model Comparison
All specifications listed below reflect published manufacturer data. Used unit performance should be verified against these specifications prior to purchase.
| Specification | Rove 6 | Rove 4 | One G5 | One G4 |
|---|---|---|---|---|
| Flow Settings | 1 – 6 | 1 – 4 | 1 – 6 | 1 – 3 |
| Weight (single battery) | 4.7 lbs | ~3.0 lbs | 4.7 lbs | 2.8 lbs |
| Display Type | LCD digital display | LCD digital display | Monochrome | Monochrome |
| Battery Life (single) | Up to 5 hrs (setting 2) | Up to 2.5 hrs (setting 2) | Up to 5 hrs (setting 2) | Up to 2.5 hrs (setting 2) |
| Sound Level | ~38 dB | ~38 dB | ~40 dB | ~40 dB |
| FAA Accepted | Yes | Yes | Yes | Yes |
| Best Used For | High-flow, active travel | Active, lower-flow users | High-flow, value seekers | Ultralight portability |
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Frequently Asked Questions
Is it safe to buy a used Inogen portable oxygen concentrator?
Yes, with the right precautions. The key factors are sieve bed condition, total operating hours, and whether the unit has been professionally inspected. A used Inogen purchased from a source that performs a documented technical inspection is generally safe. Buying privately without inspection carries meaningful risk because sieve bed degradation is not visible and can result in oxygen output below your prescription level.
What is a fair price for a used Inogen Rove 6?
A used Inogen Rove 6 in good condition with inspected sieve beds typically sells for $1,200 to $1,800, depending on hours of use, battery condition, and whether accessories are included. New MSRP is approximately $2,895. Private sales with no inspection history often list at similar prices without the assurance of verified performance.
What is a fair price for a used Inogen G5?
A used Inogen One G5 in verified working condition typically sells for $900 to $1,500. New MSRP is approximately $2,495. Units sold without sieve bed documentation should be priced at the lower end of that range to account for potential replacement cost.
How many hours do Inogen sieve beds last?
Inogen sieve beds are rated for approximately 3,000 to 4,000 hours of operation under normal use conditions. A unit used 8 hours per day reaches that threshold in roughly 1 to 1.5 years. Sieve bed replacement costs $300 to $500 depending on the model, which must be factored into the total cost of a used purchase.
Does Inogen warranty transfer to a second owner?
Inogen's standard warranty does not transfer to second owners on privately sold units. If you purchase a used Inogen through a dealer or service center, ask specifically about any service warranty or inspection guarantee they provide on the unit.
Can I use a used Inogen on an airplane?
Yes, provided the unit meets FAA acceptance criteria for in-flight use, which all current Inogen models do. However, the unit must be in proper working order and capable of delivering your prescribed flow setting reliably. A used unit that has not been inspected for sieve bed integrity may not perform reliably at altitude, where oxygen concentrating efficiency can be affected by reduced ambient air pressure.
What is the difference between the Inogen Rove 6 and the Inogen G5?
The Inogen Rove 6 is the current generation flagship with a improved battery efficiency, and a modern user interface. The Inogen One G5 is the previous generation with a smaller monochrome display and a slightly different form factor. Both deliver flow settings 1 through 6 and have comparable clinical performance. The Rove 6 is newer and typically priced higher on the used market. For most patients, the G5 represents excellent value if inspection documentation is available.
What should I ask before buying from a private seller?
Ask for the approximate total operating hours, the reason for selling, whether sieve beds have ever been replaced, the age of the current battery, whether the original charger and accessories are included, and whether any service records are available. A seller who cannot answer these questions has likely not had the unit professionally inspected, which should factor into your offer price.
What does Main Clinic Supply inspect before selling a used Inogen?
Our service technicians in Rochester, Minnesota run oxygen output verification at each flow setting, sieve bed integrity assessment, battery capacity testing, exterior and filter inspection, and functional testing of all controls and alerts. Units that do not pass are either serviced to our standards or not offered for sale.
Is the Inogen G4 worth buying used in 2026?
The Inogen One G4 weighs 2.8 pounds and is the lightest Inogen ever built. For patients who need flow settings 1 through 3 and prioritize minimal weight above all else, it can still be a practical choice at the right price. For patients who need flow settings 4 through 6, it is not appropriate regardless of condition or price.
Can Medicare cover a used portable oxygen concentrator?
Medicare Part B typically covers oxygen equipment as a rental through Medicare-enrolled suppliers rather than as a direct purchase. If you are purchasing a used POC out of pocket, Medicare does not reimburse that purchase. Our oxygen specialists can walk you through the coverage options that apply to your specific situation and help you understand what makes sense given your insurance coverage.
Related Guides
- Used Inogen Rove 6: Specifications, Pricing, and What to Inspect
- Used Inogen Rove 4: Buyer's Guide and Pricing
- Used Inogen One G5: Complete Buyer's Guide
- Used Inogen One G4: Is It Still Worth Buying?
- New Portable Oxygen Concentrators at Main Clinic Supply
- 2026 Portable Oxygen Concentrator Buyer's Guide
- All Used Portable Oxygen Concentrators
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Disclaimer: This information is for educational purposes only and does not constitute medical advice. Portable oxygen concentrators require a physician's prescription. Always consult your physician regarding your oxygen therapy needs. Pricing ranges reflect current secondary market conditions as of February 2026 and are subject to change.