A portable oxygen concentrator (POC) is the device that gets oxygen patients out of the house and onto planes. In the US it is a prescription device. Inogen states its portables are “available by prescription only”, and CAIRE states a prescription is required to buy the FreeStyle Comfort. The decision then comes down to two questions: does your prescription work on pulse dose, and how many hours a day you need away from the wall outlet.
This guide compares three current pulse-dose POCs sold in the US. HHZ lists only models whose US price it could confirm on a live retailer or manufacturer page. Specs are as published by the manufacturer, not measured by HHZ.
Step 1: confirm pulse dose works for you
All three machines here are pulse-dose only. A pulse-dose unit fires a bolus of oxygen when it detects you breathing in, rather than flowing continuously. Inogen’s own Rove 6 page says the device “is contraindicated if the patient is unable to trigger the device by breathing normally at rest”, and that “proper triggering, setup, and operation must be confirmed by an experienced clinician” (Inogen).
Pulse settings are not litres per minute, so a “setting 2” is not “2 LPM”. Ask your prescriber which setting matches your prescription on the specific model, ideally after a walk test with the device. If your prescription is continuous flow overnight, you still need a home stationary concentrator. See HHZ’s US home oxygen concentrator guide.
Step 2: compare the three current POCs
| Model | US price (source) | Pulse settings | Max output | Weight | Battery life (published) | Noise |
|---|---|---|---|---|---|---|
| Inogen Rove 6 | $2,795 (Inogen) | 1–6 | 1,260 mL/min | 4.8 lb (standard battery) | Up to 6 h 15 min standard / 12 h 45 min extended, setting 1 | 39 dBA at setting 2 |
| OxyGo NEXT | $2,495 (United Oxygen & Medical) | 1–6 | Not published on spec page | 4.74 lb (single battery) | Up to 6.5 h single / 13 h double | 38 dB at setting 2 |
| CAIRE FreeStyle Comfort | $2,415 (Rehabmart) | 1–5 | 1,050 mL/min | 5 lb (8-cell) | Up to 8 h (8-cell) / 16 h (16-cell) | 39.9 dBA |
Prices are the listed cash price on 13 October 2026, before tax, for the base battery configuration. Inogen also lists a $3,295 Rove 6 configuration and Freedom packages from $4,215. Rehabmart lists the FreeStyle Comfort with a 16-cell battery at $2,613. Battery-life figures are best-case at the lowest setting and drop at higher settings.
Inogen Rove 6
The Rove 6 replaces the Inogen One G5. Its six pulse settings deliver up to 1,260 mL of oxygen per minute, which is the widest published range of the three. It weighs 4.8 lb with the standard battery. The extended battery runs up to 12 h 45 min at setting 1, and recharges in up to 4 hours.
Inogen offers a 3-year or lifetime warranty on the concentrator, with sieve beds and accessories covered for 1 year. It states an expected service life of up to 8 years at under 5 hours of use a day. The AC supply is 100–240 V, so it works abroad.
OxyGo NEXT
The OxyGo NEXT is the lightest here at 4.74 lb with a single battery. It has six pulse settings, up to 13 hours on the double battery, and a published 38 dB at setting 2. It comes with a 5-year standard warranty, the longest of the three.
The US retailer HHZ priced it from lists it as “OxyGo Next (Inogen G5)”. The OxyGo spec page does not publish a mL/min figure per setting, so compare per-setting output on the manual or with your clinician before you treat it as a like-for-like Rove 6 substitute.
CAIRE FreeStyle Comfort
The FreeStyle Comfort has a curved body designed to sit against the hip. It offers five pulse settings up to 1,050 mL/min. It weighs 5 lb with the 8-cell battery and 6 lb with the 16-cell, and runs up to 8 hours or 16 hours respectively.
CAIRE’s warranty covers both the device and the sieve beds for 3 years. Its smart-delivery features include autoSAT, which CAIRE says is available in select geographies, and autoDOSE, which pulses automatically when no breath is detected. It is the cheapest entry point of the three at Rehabmart’s 8-cell price.
Step 3: decide how you will pay
Medicare. Medicare Part B covers home oxygen equipment, including portable systems, when you meet its criteria. You rent from a Medicare-enrolled supplier for 36 months and pay 20% of the approved amount after the deductible (medicare.gov). The CMS oxygen LCD covers a portable system for Groups I and II if you are “mobile within the home” and the qualifying test was done at rest or during exercise. It denies portable oxygen if the only qualifying test was done during sleep (CMS LCD L33797). The supplier chooses the brand, so you may not get the model you want. Full detail is in the Medicare oxygen coverage guide.
Cash, HSA or FSA. If you want a specific model, or don’t qualify for Medicare oxygen, you buy outright. Inogen states you can use HSA/FSA funds to buy direct, and offers financing (Inogen). Check eligibility with your plan administrator.
Step 4: if you plan to fly
All three makers state their POC meets FAA requirements for air travel. Under 14 CFR 382.133, airlines may require enough fully charged batteries for at least 150% of the expected maximum flight duration. That makes battery capacity a real purchase factor. On paper, the Rove 6 extended battery, the OxyGo double battery and the FreeStyle Comfort 16-cell pack give the most margin. See the FAA POC rules guide.
Verdict
Buy the Inogen Rove 6 if your prescription needs the higher pulse settings or you fly often. It has the widest published output range and a long extended-battery runtime at 4.8 lb. Choose the OxyGo NEXT if lowest weight and a 5-year warranty matter more, after confirming its per-setting output against your prescription. Choose the CAIRE FreeStyle Comfort for the lowest entry price and its 16-cell battery option. Whichever you pick, have your clinician confirm the setting on that model, and keep a continuous-flow home concentrator for overnight use if you are prescribed one.
More on portable oxygen
Compare runtimes in battery life by model, see Rove 6 vs FreeStyle Comfort and the OxyGo NEXT review, and read pulse dose vs continuous flow before you choose. Thinking of night use? See sleeping with a portable concentrator. On a budget: used and refurbished or renting for travel.
Model reviews: Inogen Rove 4, Inogen Rove 6, CAIRE FreeStyle Comfort, Oxlife Independence (continuous flow). Compare warranties.