The backlight for this machine either shuts off automatically after a short intreval or can be set to off.
The machine display is lit for ease of reading.
These machines were designed with a woman's lifestyle in mind.
Timed (T) or Spontaneous Timed (ST) modes provide a customizable backup rate that forces the machine to switch from exhalation to inhalation. In ST Mode, the machine monitors the breathing cycle and switches from EPAP to IPAP once the backup time is met or whenever the break is detected through the sensors; whichever occurs first. The time aspect is only meant to act as a backup respiratory rate to the (S) function (see Spontaneous). This is used for patients with central sleep apnea, or those who need non-invasive mechanical ventilation.
Spontaneous (S) mode tells the machine to start blowing at IPAP pressure with no specific interval set. The machine must wait and detect a break in the breathing cycle before reacting, switching from exhalation to inhalation. If a backup rate is needed, then the unit will need a time interval setting and will be marked 'Yes' on the Timed property.
This feature detects excessive mask leaks due to poor cushion seal or when a user stops therapy by removing a mask when in use. The alert can be in the form of an audible alarm (ALARM) or a text message on the unit's LCD display (LCD).
This feature turns the machines off and on when putting on or taking off the mask. When you put your mask on the machines senses you breathing and turns itself on. Take off the mask and the machine turns off.
Altitude Adjustment is defined as the machine's ability to compensate for changes in altitude. Compensation can either occur manually or automatically. Manual adjustments occur within the Setup Menu and must be set by the user. Automatic requires no user intervention.
Software is an option on some CPAP machines. The software can give details on compliance and performance. The patient or physician downloads the data from the CPAP machine to determine how long a patient has used their machine each night and how well the machine is working to stop Apnea/Hypopnea events. This property shows the software package to use for machine that has the ability to transfer data to your computer and report Hours of Usage. See Advanced Software for a list of machines that can report AHI or Leakage.
This property marks the machines that have the ability to record performance data on a removable card. Some machines that are flagged as having software (seeOptional Software), do not have removable memory cards, rather instead, records information on-board and must use a download cable to retrieve the data from the machine.
Identifies which machines are data capable and have the ability to track your therapy progress over time. The machine captures key metrics like AHI (Apnea/Hypopnea Index), Leakage, and most pressure used. Depending on the machine, the data can be retrieved through an on Machine Screen Display (MSD), through Optional Software (OS), and/or through SmartCode (SC).
An integrated battery pack attaches to and functions seamlessly with the machine it is integrated with. It allows your CPAP to run on AC and fail over to the DC battery only if necessary.
A 'Yes' answer indicates that the CPAP Machine has an optional DC cable that plugs directly into a DC port. This allows you to use a DC power source, such as a battery or car cigarette lighter outlet. Some optional DC cables include alligator clips to connect directly to battery terminals. See the "Power" tab of the machine's product page for more detailed information on how the machine works with alternate power sources, and what optional cables and batteries are compatible.
Domestic Voltage is the voltage that is used with a standard wall outlet in the United States and ranges from 100-120 volts. International Voltage can range from 220v-240v AC.
Indicates which machines have a DC port in which you can use to connect a battery pack or a deep cycle marine battery with an optional DC cable. This is different from an integrated battery that works only with the machine it was designed for. (i.e. Everest CPAP Machine) see property Integrated Battery
This is the maximum altitude at which the machine will properly operate.
Leak Compensation is a machine feature that identifies mask leaks and adjusts to maintain the delivered pressure as set. If marked N/A assume the information is not available due to being out of production or unavailable.
This property defines whether the machine is capable of continuously blowing a constant pressure. All CPAP machines are defined as 'continuous', but some BiPAP's and APAP's also come with a CPAP mode; some BiPAP and BiLevel machines Do NOT. By setting the IPAP and EPAP to the same pressure, a CPAP Mode is achieved, preventing the EPAP pressure from dropping.
The Ramp feature allows the user to start treatment at a lower pressure to fall asleep with, gradually raising the pressure over a set time. This is a comfort setting and can set from 0 to 45 minutes on most CPAP machines.
Pressure Relief is a feature that lowers your therapy pressure to help with difficulties breathing against the machine's airflow, providing a more comfortable and natural breathing pattern. Assistance can occur on the Exhalation, on the Inhalation, and on both exhalation and inhalation at the same time.
This Property lists the operating range for the Exhalation Positive Airway Pressure (EPAP). This is the pressure setting used when you exhale. EPAP is always lower than the IPAP (inhalation) pressure, making breathing out easier and more comfortable.
A CPAP (Constant Positive Air Pressure) delivers continuous airflow at a prescribed pressure at 4cm to 30cm. APAP operates between a range and BiPAP machines are a mix of ranges and constant pressures. This pressure is measured in centimeters of water pressure (H2O) and 4-20cm is average pressure range on most CPAP machines.
This property defines whether the machine automatically adjusts pressure to meet the needs of the CPAP user on a breath-by-breath basis. All APAP machines are defined as 'Auto Adjusting', but some BiPAP's also use an Auto feature on both the IPAP and EPAP. If not marked, Yes, assume the machine does not have AUTO capabilities.
This is the maximum water capacity held by the chamber of the compatible humidifier.
This indicates that the machine has an integrated heated hose option to enhance humidification and reduce rainout. An integrated headed hose receives power directly from the machine and does not require a power supply. The tube's heat settings are set through the machine menu screen.
A yes in this field indicates the machine and humidifier have technology to reduce rainout, the water that collects in a hose when using a heated humidifier. Sensors measure the air temperature in the room and adjust the amount of heat and moisture delivered to the mask to reduce or omit rainout.
This property identifies how the machine incorporates a Heated Humidifier. Build In humidifiers are built into the CPAP machine and cannot be separated from the machine. Integrated humidifiers connect directly to the CPAP machine and they can only be used with compatible CPAP machines. With Integrated humidifiers, the CPAP machine, can be separated and used without the humidifier. CPAP machines that do not have a built in humidifier and do not have an integrated humidifier option have to use a Stand Alone humidifier as the machine's heated humidifier option. Stand Alone humidifiers can be used with any machine and connect to the CPAP machine with an additional hose.
Identifies which CPAP has a humidifier that is built into the CPAP. Built-In humidifiers cannot be separated from the CPAP machine.
This indicates which heated humidifier works best with the listed CPAP machine. In some instances, Built-in is used to describe a machine/humidifier combination system. The Fisher and Paykel HC150 was used for machines that do not have an integrated or built in humidifier system.
Measures the overall dimension of the machine only. Machines with a built-in humidifier are marked NA and must refer to Entire Size dimensions.
This is the size of the CPAP with Heated Humidifier in its travel bag.
This is the combined dimensions of the CPAP with the Heated humidifier.
This is the combined weight of the machine, heated humidifier, power cables, bag and hose. The weight of the shipping box is not included in the number.
This is the actual weight of the CPAP Machine without any accessories, power cord, or humidifier. Machines with a weight 3lbs or less are also identified in the Under 3 lbs property.
This measures only the weight of the machine and does not include total weight of power cables, bag, additional batteries or non-built-in humidifiers.
Looking to travel? We have found some machines are easier to travel with than others. These smaller and more lightweight machines are still robust enough for constant daily use as well as travel.
This indicates which manuals are included with the purchase of a CPAP machine. Most all machines come with a patient manual; also called 'user manual', which may or may not have pressure setting instructions. Some machines come with both the patient and quick setup guide or both patient and clinician manuals.
This identifies which machines have a decibel rating of 29 and lower. This does not account for use with the humidifier attached, which could supply additional volume that can muffle or amplify sound. This property does not account for noise that travels through the CPAP tubing, seemingly sounding louder than the measured db rating.
This is the level of sound the machine produces at a pressure of 10cm, standing 1 meter away or roughly 3 feet from machine. Measured in Decibels, the values also indicate whether the machine is considered a "quiet CPAP"; see Quiet property.
Warranty is the length of time that the manufacturer will guarantee a product to be free of defects. Warranties vary in length depending on manufacturer, but generally all machines come with a 2 Year Warranty.
This identifies the machine as continuous, auto adjusting, or bilevel operation. This does not identify whether the machine automatically adjusts pressure. Auto adjusting refers to APAP, whereas BiPAP Auto is differentiated using the Auto Pressure Adjustment property. BiPAP machines are defined further using Spontaneous or Timed properties.
A CPAP machine blows one constant pressure of air into your passageway throughout the night. Your ideal pressure was determined during your sleep study.
A BiPAP machine delivers two separate pressures of air; One when the patient inhales and a separate pressure when they exhale. The machine alternates between the two set pressures to help optimize your sleep apnea treatment.
An APAP machine automatically adjusts on a breath by breath basis to blow the minimum pressure needed to keep your airway open during sleep. This allows your machine to provide you with your ideal pressure nightly.
This is the company that produces the product being compared.
This is a bilevel machine which differs from a CPAP in that it switches back and forth between two pressure levels, one higher and one lower, rather than providing one continuous pressure level. The pressure upon inhalation is higher to hold the airway open, but as the user exhales, the pressure drops to a preset lower level. A bilevel machine responds well to people with very high CPAP pressure needs, weak chest wall muscles, lung disease or other health problems that keep them from being able to exhale against a CPAP pressure.
This product is no longer available. A suitable alternative to this device would be the AirCurve 10 VA BiLevel Machine. This auto-adjusting BiPAP automatically chooses the inhale and exhale pressures for you so you don't have to manually set either pressure. It also comes with a built-in heated humidifier for optimal therapy comfort.
Bilevel is the generic term to describe these machines. BiPAP, for Bilevel Positive Airway Pressure, is registered with Respironics; ResMed uses VPAP for Variable Positive Airway Pressure.
The Puritan Bennett GoodKnight 425 Bilevel machine includes the following features:
Smallest, lightest Bilevel, BiPAP or VPAP on the market.
SilverLining 3.10 Data Management software option to download compliance and session data.
International power supply to operate on any AC current from 110 to 240 without adjustment to the machine. (An adapter may be needed to plug the CPAP into a wall outlet outside the US.)
Direct DC operation without the need for a DC/AC inverter, just a cable and adapter which are sold separately on our site.
Automatic altitude compensation adjustment.
Two washable, reusable pollen filters are included; optional ultra-fine filters are available.
2 year manufacturer warranty against defects.
This Product Includes...
GoodKnight 425 Bilevel Machine
6 Foot Hose
Carrying Case
2 Reusable Foam Filters
All Manuals
Pressure Range 4cm to 25cm H2O
Ramp Time 0 to 30 min. (5-min. increments)
Starting Ramp Pressure From 4cm, patient-adjustable
Dimensions 5.6" x 2.9" x 7.7"
Weight Bilevel: 1.54 lbs.; Power Supply Module (included): 1.16 lbs.; Total weight 2.7 lbs.
Altitude Compensation Automatic
Electrical Requirements 100 - 240 AC, 12volt DC
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This is a great bilevel machine, just as small and lightweight as the 420 series of CPAPs. Puritan Bennett released the component heated humidifier that will integrate with this bilevel. (The price of this unit does not include the humidifier.)
Bilevel machines come with a six foot hose, a travel bag and manuals. Masks are not included and must be purchased separately. We will be happy to help you with sizing and offer suggestions on current popular masks.
The 12 volt jack on this machine is not the same size as the 420 series cpap machines. Use the Respironics "12volt DC Power Cord (to connect CPAP to cigarette lighter socket)" for battery operations. Part # 1001956.
Error Note: If the machine displays an error 7 or "ER 7" this indicates an issue internally with the machine's blower. You can contact the provider of the machine to seek service if it is available, or the machine may need to be replaced.
Manufacturer Warranty
This machine comes with a 2 Year Manufacturer Warranty. CPAP.com will work with the manufacturer on your behalf if the machine needs repairs. Please follow these steps:
Contact us at cpap@cpap.com or 1-800-356-5221 to receive an RMA (Return Merchandise Authorization) Number before returning the equipment
Include a note with the machine describing the issue you are experiencing, along with your full contact information to include a return shipping address and the RMA number provided to you
Ship only the defective items to CPAP.com at 13235 N Promenade Blvd Stafford, TX 77477
Do not return accessory items such as the carry bag, hose or power cords
Email updates will be sent to keep you informed as the machine moves through the warranty process
CPAP.com will contact the manufacturer on your behalf and handle all shipping between us and the manufacturer
The repaired or replaced unit will be returned to you. Shipping charges may apply.
Please note: The manufacturer warranty is voided by water damage or misuse of the machine.
Universal Power
This system operates automatically between 110v and 240v AC. When traveling either inside or outside the USA, there are no switches to switch or fuses to change. The machine will automatically sense what voltage is needed and set itself to run on that power.
The user will need to adapt the plug that goes into the wall to fit the style of outlet socket that is being used. This is simply done with a Power Adapter Plug kit. This is the same type of plug adapter that would be used with a hair dryer or an electric shaver. World Traveler Power Adapter Plugs.
This machine come equipped with a DC plug on the back of the unit. This allows the user to connect the CPAP to an external DC battery source. The IntelliPAP can be powered by plugging the 12volt DC Power Cord into a cigarette lighter plug. This is ideal for traveling by car, boat, or recreational vehicle that is equipped with a cigarette lighter plug.
The 2.5 lb CPAP.com Battery Pack is surprisingly small and lightweight. The lithium ion battery can be recharged at any discharge level without losing charge time due to battery memory loss. This battery has been approved by the United Nations and Department of Transportation as tested safe for travel. This battery kit comes with the CPAP.com battery and the 12 Volt DC Power Cord.
I've got a very convenient BiLevel machine at home, but its's quite heavy. So I bought the GoodKnight 425 - This machine is unbeatable for travilling use and I'm very comfortable with that piece. more...
1 person found this helpful.
Verified Customer
Verified purchase
This is a welcome change from my previous machine which was bulky and noisy. The Goodknight 425 is so quiet you can barely hear the machine when it is on. And it is so light and compact, it is very easy and very convenient to bring it anywhere. more...
4 people found this helpful.
Verified Customer
Verified purchase
Extremely quiet, works very well.
2 people found this helpful.
Verified Customer
Verified purchase
Goodknight 425 Bilevel Machine
This unit delivered everything I had hoped it would, and I am very pleased with the results.
There is a bit more noise when exhaling than with my bedside unit, but not a problem once you use it for a night or two. Also, the control buttons are a little more difficult to press than I am accustomed to, but not too difficult.
I liked the lightness of the unit when travelling, and will consider getting the humidifier as well.
The unit appears to be excellent in every other way.
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3 people found this helpful.
Verified Customer
Verified purchase
Small but perfectly formed
BiPAP Goodknight 425
Being in the Uk I receive a free BiPAP machine with service and treatment. Unfortunately this means that they are purchased bulk and tend to be the less portable type of machines. I like to travel and having to carry a heavy BiPAP around is a real chore, paticularly because I do not drive and have to use public transport.
The second effect of the Health Service monopoly is that very few BiPAPs are purchased privately so they tend to be expensive, double the price than in the USA. To purchase my Goodknight 425 in the UK would have cost me $1700 and a battery pack $700 so I had to import from America. In fact it would be cheaper for me to fly to the USA from England to buy a machine than to buy one here.
From confirmed order to arrival was 4 days, exceptionally speedy, and because it was medical equipment it carries no import duty or sales tax. There was a small amount of administration getting a prescription but that was not to difficult.
The machine itself is fantastic, light weight, small and easy to use, both US and UK power covered in the one power pack.
Combined with the batery pack and all the leads and tools it weighs less than ten pounds, half the previous weight that I was lugging around. I have used it for two nights now to make sure I can get used to it before I travel and it is fine. Excelent in fact, and so quiet.
Once I am fully comfortable and familiar with the machine I will try the battery combination to see how long it lasts with my BiPAP settings and how long it takes to charge.
If only I can work out some way of charging the battery by solar power then my stays on remote beaches will happen more often and with a lot less worry. more...
