Inogen One G5 Portable Oxygen Concentrator vs Inogen One G4 Portable Oxygen Concentrator
Buy the Inogen One G5 if you need more than 3 flow settings or long battery life. Buy the G4 if you want the smallest, lightest unit and only need settings 1-3. Prices are nearly identical: $1,899 at the lowest daily price since November 1, 2026 for the G5, and $1,895 for the G4. The G5 is the better value at that gap, unless size and weight are your top priority.
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Inogen One G5 Portable Oxygen Concentrator
4.5Choose the Inogen One G5 if you need up to 6 pulse-dose settings, up to 13 hours on a double battery, or a quieter 38 dBA unit for travel and all-day use.
Pros
- Six flow settings cover a wider range of prescriptions
- Up to 13 hours at setting 1 with a double battery
- Quiet at 38 dBA
- FAA approved for air travel
- 3-year concentrator warranty
Cons
- Heavier than the G4, especially with the double battery
- Costs more once you add a double battery and backpack
- Prescription required
What separates them
| Inogen One G5 Portable Oxygen Concentrator | Inogen One G4 Portable Oxygen Concentrator | |
|---|---|---|
| Flow settings | 1 to 6 pulse dose | 1 to 3 pulse dose |
| Weight | 4.7 lbs (5.7 lbs with double battery) | About 2.8 lbs |
| Noise level | 38 dBA at setting 2 | 40 dBA |
| Battery life | Up to 13 hours at setting 1 with double battery | Shorter; single battery in the box |
| Breath detection | Intelligent Delivery, breath-sensing | Intelligent Delivery, oxygen within 400 ms |
| Sleep use | Pulse dose; check with your clinician for sleep | Marketed for use during sleep |
| Warranty | 3 years concentrator, 1 year sieve beds and accessories | Standard Inogen warranty; confirm terms |
Price history
$2,225.00$1,895.00
- Inogen One G5 Portable Oxygen Concentrator: lowest $1,899.00 on Nov 1 at Order Your Supplies; $2,225.00 on Nov 2.
- Inogen One G4 Portable Oxygen Concentrator: lowest $1,895.00 on Nov 1 at MajorCPAP; $1,895.00 on Nov 2.
Prices at every store
Inogen One G5 Portable Oxygen Concentrator
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Inogen One G4 Portable Oxygen Concentrator
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- MajorCPAPCheck price at MajorCPAP
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Specs compared
| Spec | Inogen One G5 Portable Oxygen Concentrator | Inogen One G4 Portable Oxygen Concentrator |
|---|---|---|
| Flow Rate | 1 to 6 (settings) | — |
| Oxygen Purity | 90% +6%/-3% at All Settings | — |
| Weight | 4.7 lbs (2.13 kg) | — |
| Medical Use | Yes | — |
| Operating Mode Type | Pulse Dose | — |
| Oxygen Sensing | Yes | — |
| Safety Certifications | FAA Approved | — |
| Portability | Portable | — |
| Type | Pulse flow | — |
| Sound Level | 38 dBA (at setting 2) | — |
| Color |
Questions and answers
- Which is better for flying?
- Both are FAA approved. The G5 gives you more settings and longer battery life, which matters on long flights. The G4 is easier to carry through the airport.
- Is the G5 worth the extra money?
- The price gap is small: $1,899 versus $1,895 at their lowest daily prices since November 1, 2026. The G5 adds three more settings, longer battery life and quieter operation for about $4 more.
- Which is quieter?
- The G5 is rated 38 dBA at setting 2. The G4 is rated 40 dBA, and one reviewer found its motor and burst-of-air noise louder than expected.
- Can I use either one while sleeping?
- The G4 is marketed for use during sleep. The G5 is pulse dose, so ask your clinician whether it fits your sleep oxygen needs.
- Which lasts longer on a battery?
- The G5 runs up to 13 hours at setting 1 with a double battery. The G4 ships with a single battery and runs for less time.
- Do I need a prescription for both?
- Yes. Both are prescription medical devices, so you need a valid Rx before ordering.