Oxygen Concentrators: Portable vs. Stationary
Two machines do two different jobs. Here is how to read flow type, liter capacity, battery life, weight, and FAA approval against your prescription — and why most people end up with both, not one.
Respiratory Buyer's GuideRead this first
Oxygen is a prescription medical device. A clinician sets your flow rate and delivery type — and whether you need oxygen at rest, on exertion, or while sleeping. Nothing on this page replaces that prescription. Use it to understand the trade-offs before you talk to your provider or supplier, not to self-select a machine. Buying a concentrator that doesn't match your prescribed flow can mean you're under-oxygenated without knowing it.
Continuous flow vs. pulse-dose — this is the decision that matters most
Every other spec follows from one question: does your prescription call for continuous flow or can it be met with pulse-dose delivery? Continuous-flow machines push oxygen steadily, measured in liters per minute (LPM). They're required for most sleep use, high flow rates, and anyone on a CPAP/BiPAP bleed-in. Stationary home units typically deliver up to 5 LPM continuous, some up to 10.
Pulse-dose units sense the start of each breath and deliver a measured "bolus" only on inhale, rated in settings (1–6) rather than true LPM. This is what makes portable units small and battery-friendly — but a pulse setting of "3" is not the same as 3 LPM continuous. Many people who need 2 LPM continuous at rest cannot be safely covered by a pulse unit while sleeping. Match the delivery type your clinician prescribed; don't assume a portable's number equals your liter rate.
What the portable specs actually cost you
Weight: Portable concentrators (POCs) run roughly 5–18 lbs. Lighter usually means fewer continuous-flow options and shorter runtime — the catch is real. A 5 lb unit is genuinely carryable but often pulse-dose only.
Battery life: Quoted runtimes assume a low pulse setting. At a setting of 3–4, a battery rated "8 hours" may deliver 3. Plan around your actual setting, and price a second battery into the decision — it's the difference between a day out and being tethered to an outlet.
Noise: Stationary units hum at roughly 40–50 dB — noticeable in a quiet bedroom. If the machine lives where you sleep, ask about decibel ratings and consider a longer tubing run so the unit sits in another room. POCs are quieter but their pulse "tick" can be audible in still air.
Building a realistic home-plus-on-the-go setup
Most long-term oxygen users aren't choosing one machine — they're building a two-device system. Here's the order to think it through.
Anchor on the prescription
Start with the exact prescribed flow type and rate for each situation — rest, exertion, sleep. These can differ. A sleep requirement for continuous flow usually forces a stationary unit into the picture regardless of how mobile you are.
Choose the stationary unit for home base
Pick a home concentrator that covers your highest prescribed continuous rate with headroom — including overnight. This is the workhorse: always plugged in, quiet enough for the bedroom, no battery anxiety. It carries the heavy hours.
Add a portable matched to your lifestyle, not the spec sheet
Choose the POC around how far and how long you actually go. Errands and appointments need different runtime than full travel days. Confirm the pulse setting that satisfies your exertion prescription, then buy enough battery to cover real outings.
Plan for travel and air
For flights, confirm the unit is FAA-approved (a specific certification list — not all POCs qualify) and check airline battery rules: most require batteries covering 150% of flight time. For driving, a DC car-charging cord keeps the POC topped up between stops.
Set a service rhythm
Concentrators have particle and sieve-bed filters that degrade. Note the manufacturer's filter and sieve-replacement intervals, and have output oxygen purity checked periodically — a unit can run and still drift below spec. Servicing is the quiet part of staying on-prescription.
Frequently asked questions
Can a portable concentrator replace my home unit entirely?
Sometimes, but rarely if you have an overnight or higher continuous-flow requirement. Pulse-dose delivery depends on sensing each breath, which can falter during sleep when breathing is shallow. Many people are cleared for a POC by day and still need continuous flow at night. Let your clinician confirm — never assume one machine covers all situations.
Does a pulse setting of 3 equal 3 liters per minute?
No. Pulse settings (1–6) describe the size of the bolus delivered on each inhale, not a steady liters-per-minute rate. The relationship between a pulse setting and an equivalent continuous flow varies by device and by your breathing rate. This is the single most common — and dangerous — misread when buying. Match the delivery type your prescription specifies.
Will my concentrator work at altitude or on a plane?
Output can drop at higher elevations because the air is thinner, so a unit that holds your prescription at sea level may under-deliver in the mountains. For flights, only FAA-approved POCs are permitted, and you must carry batteries covering roughly 150% of flight time. Check both your destination altitude and the specific airline's policy before you travel.
How loud is a home concentrator, really?
Most run around 40–50 dB — comparable to a quiet refrigerator, but enough to notice in a still bedroom. If sleep noise concerns you, ask for the decibel rating and use longer tubing so the unit can sit in an adjacent room. Portable units are generally quieter but produce an audible pulse tick.
When is the cheaper, simpler option actually the right one?
If your prescription is for low-flow oxygen at rest only — and you rarely leave home for long stretches — a single quiet stationary unit plus a long tubing run may be all you need. Not everyone needs a portable, and a lightweight POC you'll rarely use is money better spent on a second home-unit battery backup or a service plan. The right setup is the one that matches your prescription and your actual days, nothing more.
Not sure how your prescription maps to a machine?
Bring us your prescribed flow type and rate, and we'll walk through the real trade-offs between stationary, portable, and a two-device setup — no upsell, just the catch, the cost, and the cases where less is the right answer.