Types of Oxygen Concentrators Explained: Home vs. Portable, Continuous Flow vs. Pulse Dose
Learn the main types of oxygen concentrators, how home and portable models differ, and how continuous flow and pulse dose delivery compare.
People researching oxygen therapy often ask a simple question: how many types of oxygen concentrators are there?
The clearest answer is that there are two main types based on how they are used:
Oxygen concentrators can also be classified by how they deliver oxygen. The two main delivery methods are continuous flow and pulse dose. Some models combine both modes.
These categories describe different aspects of the same device. “Home” and “portable” describe mobility and power requirements, while “continuous flow” and “pulse dose” describe how oxygen reaches the user.
Understanding both classifications is important. A small machine may be convenient to carry but may not provide the delivery mode or oxygen output required by a prescription. Likewise, a home concentrator may provide steady oxygen but cannot offer the freedom of a battery-powered portable unit.
What Does an Oxygen Concentrator Do?
An oxygen concentrator draws in surrounding air, which contains approximately 21% oxygen. It uses filters, a compressor, and molecular sieve material to remove much of the nitrogen before delivering oxygen-enriched gas through tubing and a nasal cannula or another prescribed interface.
Unlike an oxygen cylinder, a concentrator does not store a limited supply of compressed oxygen. It continues concentrating oxygen from the surrounding air as long as it has a suitable power source and is operating correctly.
According to the American Lung Association, home concentrators normally operate from an electrical outlet, while portable oxygen concentrators can use rechargeable batteries and external power.
Supplemental oxygen should be used according to instructions from a qualified healthcare provider. The FDA’s guidance on at-home oxygen therapy warns that receiving too much or too little oxygen can be harmful.
Type 1: Home or Stationary Oxygen Concentrators
A home oxygen concentrator is designed primarily for use in a fixed location. It is normally powered by a household electrical outlet and often provides continuous oxygen for extended periods.
Home units are generally larger than portable models, but their size allows them to use more substantial compressors and cooling systems. Depending on the model, they may also offer wider flow ranges, larger displays, remote controls, humidification, alarms, timers, or nebulizer functions.
A home oxygen concentrator may be appropriate when:
- Oxygen is mainly needed at home
- Continuous flow has been prescribed
- The machine will be used for extended periods
- Battery operation is not a primary requirement
- A larger flow range is needed
The main limitation is mobility. Although many home units have handles or wheels and can be moved between rooms, they are not intended to be carried throughout the day. They also depend on electricity, so anyone who relies on oxygen continuously should discuss a backup oxygen and power-outage plan with their healthcare provider or equipment supplier.
The Higreen Health DF-018 home oxygen concentrator is one example of this category. It provides adjustable 1–9 L/min continuous flow and has a manufacturer-rated operating noise level of 40 dB or less. It also includes a large display, remote control, humidifier and nebulizer function.
Type 2: Portable Oxygen Concentrators
A portable oxygen concentrator, commonly called a POC, is built for mobility. These machines are smaller and can normally operate from rechargeable batteries, household AC power and, on compatible models, vehicle DC power.
Most portable concentrators use pulse-dose delivery because releasing oxygen during inhalation helps reduce power consumption and allows the machine to be smaller. However, some portable models provide continuous flow, and others offer more than one operating mode.
A portable oxygen concentrator may be useful for:
- Walking and everyday errands
- Visiting family or attending appointments
- Car journeys
- Outdoor activities
- Travel, when the device meets transportation requirements
- Maintaining mobility outside the home
The word “portable” does not necessarily mean that a device is lightweight, suitable for every prescription or approved for use aboard an aircraft. Battery duration also changes with the selected setting, breathing rate, battery age and environmental conditions.
For example, the Higreen Health POC-04 is a portable pulse-flow model with seven adjustable settings, a removable battery and a listed weight of 4.4 pounds. Its battery is rated for up to five hours at the lower setting, with shorter runtimes at higher settings.
Portable continuous-flow options are also available. The Higreen Health 1001S offers adjustable 1–5 L/min continuous flow in a battery-powered design. Its listed oxygen concentration and battery runtime decrease as the flow setting increases, making the flow-performance chart especially important when assessing whether it matches a user’s requirements.
Continuous Flow vs. Pulse Dose Oxygen Delivery
The difference between continuous flow and pulse dose is just as important as the difference between home and portable equipment.
Continuous Flow
A continuous-flow oxygen concentrator supplies oxygen at a steady rate, whether the user is inhaling or exhaling. The output is usually expressed in liters per minute, or L/min.
Continuous flow may be prescribed when a steady oxygen supply is required. It is also commonly found in home concentrators and certain portable models.
Because oxygen is delivered continuously, these machines may consume more power than comparable pulse-dose models. A portable continuous-flow unit may therefore have a shorter battery runtime or require a larger battery.
Pulse Dose
A pulse-dose concentrator detects the beginning of an inhalation and releases a measured burst of oxygen. Oxygen is not continuously released during exhalation.
This delivery method can conserve oxygen and battery power, allowing manufacturers to build smaller and lighter devices. Pulse-dose systems are widely used in portable oxygen concentrators.
However, a pulse setting of “3” is not automatically equal to 3 L/min of continuous flow. Settings represent device-specific oxygen doses, and the amount delivered can vary between brands and models. The American Lung Association advises users to confirm with their healthcare provider that a pulse-dose setting meets their oxygen requirements.
Testing may be needed during rest, activity and sleep because breathing patterns change in each situation.
Dual-Mode Concentrators
Some portable oxygen concentrators provide both pulse-dose and continuous-flow operation. These models offer additional flexibility, but the available output, oxygen concentration and battery runtime may be different in each mode.
A dual-mode machine should therefore be evaluated by its performance in the mode that will actually be used—not simply by the presence of both options.
Home vs. Portable Oxygen Concentrators at a Glance
| Feature | Home concentrator | Portable concentrator |
|---|---|---|
| Primary use | Regular use in one location | Mobility and travel |
| Power | Household electricity | Battery, AC and sometimes vehicle DC |
| Common delivery mode | Continuous flow | Usually pulse dose; some continuous or dual-mode |
| Battery operation | Usually unavailable | Usually included |
| Size and weight | Larger and heavier | Smaller and easier to carry |
| Runtime | Operates while connected to power | Limited by battery capacity |
| Key consideration | Flow, concentration and backup power | Delivery mode, weight and actual battery life |
Some oxygen users have both types: a home concentrator for regular use and a portable model for leaving the house. Whether this is necessary depends on the person’s prescription, daily routine and insurance or equipment arrangements.
How to Choose the Right Type of Oxygen Concentrator
There is no single best oxygen concentrator for every user. The right choice is the machine that reliably meets the prescribed oxygen requirement in the situations where it will be used.
1. Start With the Prescribed Oxygen Requirement
Confirm the required flow rate, delivery mode and hours of use with a healthcare provider. Requirements may be different during rest, physical activity and sleep.
Do not change the flow setting simply because a different number feels more comfortable or produces a higher pulse-oximeter reading.
2. Check Oxygen Concentration at the Required Setting
Some machines maintain a similar oxygen concentration throughout their settings, while others produce a lower concentration as flow increases.
Look for a complete flow-and-concentration chart. A product advertised as “1–9L,” for example, may not provide the same oxygen concentration at 9 L/min that it provides at 1 L/min.
3. Do Not Directly Convert Pulse Settings to L/min
Pulse-dose numbers are not universal. A setting of 2 on one machine can deliver a different oxygen dose from setting 2 on another.
If changing from continuous flow to pulse dose, the new device should be evaluated under the same conditions in which it will be used.
4. Compare Realistic Battery Runtime
Battery claims commonly represent operation with a new, fully charged battery at a low setting. Higher settings usually reduce runtime.
For daily use or travel, calculate how long the battery lasts at the required setting and include extra time for delays. Also consider whether batteries can be removed, charged separately and replaced during use.
5. Consider Noise, Controls and Maintenance
For home use, noise may be important when the concentrator operates near a bed or shared living area. Controls should be easy to read, and alarms should be clearly explained in the manual.
Filter cleaning, cannula replacement, battery care and ventilation space should also be included in the decision.
6. Plan for Power Interruptions
A concentrator stops producing oxygen when it loses power or develops a fault. Users who depend on oxygen should have a backup plan recommended by their healthcare provider or oxygen supplier.
The American Lung Association’s oxygen safety guidance also recommends keeping oxygen equipment away from smoking, open flames and heat sources.
Conclusion
There are two basic oxygen concentrator types—home and portable—but choosing between them requires more than comparing size. Continuous flow, pulse dose, oxygen concentration, battery runtime and performance at the prescribed setting all matter.
Before making a decision, review the full specifications with a healthcare professional or respiratory therapist. You can also compare the available Higreen Health oxygen concentrators by delivery mode, flow range, weight and power options.
Medical disclaimer: This article is intended for general educational purposes and does not replace professional medical advice, diagnosis or treatment. Supplemental oxygen and device settings should be determined by a qualified healthcare provider.