Respironics has added a DC compatibility feature for CPAP users who would like to connect a DC battery source to their CPAP. The M Series DC Compatible Heated Humidifier works with any model within the M Series product line. (DS100, Plus, Pro, Auto, or BiPAP) Use the DC input on the back of the humidifier to supply battery backup to both your CPAP and Humidifier. Batteries like the CPAP.com Battery Pack will provide up to 4 hours of battery backup for your system.
The DC Compatible Heated Humidifier is also an ideal solution for CPAP users who need humidification, but enjoy outdoor activities or use a CPAP when AC power is not readily available. The DC Compatible Heated Humidifier, the Respironics DC Power adapter, and a large battery like the Respironics Battery Pack are all needed to power both your Heated Humidifier and CPAP machine for more than 4 hours.
Return On Warranty Issues Only
This Product Includes...
41° F to 95° F
(5° C to 35° C)
-4° F to 140° F
(-20° C to 60° C)
15 to 95% (non-condensing)
Atmospheric Pressure Operating
77 to 101 kPa
(0 - 7500 ft.)
Atmospheric Pressure Storage
8.25 in. L x 8.75 in. W x 4.0 in. H
(21 x 21.9 x 10.3 cm)
Weight (with water tank empty):
Approximately 1.2 lbs (< 1kg)
1 1/3 cups (325 ml) at recommended water level
This humidifier is designed to conform to the following standards:
IEC 60601-1 General Requirements for Safety of Medical Electrical Equipment
EN ISO 17510-1 Sleep Apnea Breathing Therapy Devices
AC Power Consumption:
100 - 240 VAC, 50/60 Hz, 1.7 A max.
Type of Protection Against Electric Shock:
Class II Equipment
Degree of Protection Against Electric Shock:
Type BF Applied Part
IPX1: Drip Proof Equipment
The device meets the requirements of EN 60601-1-2, 2nd edition.
1 to 5 (104° to 158° F / 40° to 70° C)
Pressure Drop with Humidifier:
(max.) 0.3cm H2O at 60 LPM flow
10 to 40 mg H2O/l
Type 1 per IEC 60825-1
When necessary, dispose of the humidifier in accordance with local
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A valid prescription is required for the purchase of this product.
Philips Respironics products are for sale only to patients within the U.S. and not to other third parties or businesses.
All services provided by CPAP.com, including advertisement, ordering, sale, delivery, instruction, and setup of the products are performed solely by CPAP.com and independently of the manufacturer.
This is the integrated heated humidifier that works with any Respironics M Series CPAP, APAP, or BiPap Machines.
Includes only the humidifier, CPAP pictures for demonstration only.
"The M Series Heated Humidifier works fine but is a bit wide when attached to the c-pap. I think it would have been better designed to fit under the machine instead. The chamber must be removed to be filled and the fill line is too high as water comes out an opening when you fill it this far. I marked a new fill line on the chamber. Dial to change the level of humidity is a nice improvement over the previous model.
CPAP.com was wonderful to work with. The unit, packed in its original box, was shipped the same day. Price was good and when I contacted them by phone the sales person was knowledgeable and helpful. Thanks for the fine service."
Voted most helpful critical review
Leaks like a sieve, poor design
John D D. – October 29, 2006
"I purchased the M series Humidifier along with my M series Auto, they came assembled together. I found with the side-by-side design of this unit it makes the overall machine size footprint much larger than the Classic with its stacked humidifier, defeats the whole concept of making it smaller. I've used it now several weeks and several times now I've found a puddle of water under the machine on the nightstand. You cannot refill the tank without completely removing tank from the unit. The tank has 2 square horizontal holes with a silicone gasket where the air from the machine goes in and passes over the water and back out. You remove and flip the tank up vertically to refill through those same square air holes. After the first puddle was seen, I have been very careful when refilling even drying off the exterior of the tank with a towel before turning it horizontal and reinserting back into the humidifier housing. It slides in very easy. The next morning I find another puddle under the machine. It seems to happen with the tank is full. There are arrows which shows you where to fill the tank, I have never exceeded that fill mark. Since I go through about 1/2 tank of water per night at heat setting of only 2, it appears to be functioning okay. But the leaks under the machine are totally unacceptable in my opinion. I would suggest the F&P HC150 for this unit until they get the bugs worked out of it, you can use the HC150 with any machine."
"My old humidifier had stopped working and this replacement was the perfect match. Great to have the humidifier function working again and NO LEAKS from the reservoir."
Jon S, FL – January 30, 2014
"This is an updated model and what a pleasant surprise. No more leaks and impossible to overfill. I love it and it will still fit in original travel case. This M series humidifier when from fair to excellent."
Mark C, DE – January 19, 2014
"I was very pleasantly surprised that the tank was included. The new heater works great"
Many PAP users experience nasal congestion and dryness of the nose and throat during treatment. This can be especially problematic for new users who are adapting to treatment. Humidification adds moisture to the air helping to reduce the symptoms of dryness and congestion.
Nasal congestion also leads to mouth breathing, which perpetuates the problem of dryness. If this is an issue for you, try a heated humidifier.
What is a heated humidifier?
A heated humidifier uses heat to warm the water to add moisture to the airstream. The heat is adjustable for more or less moisture. The water chamber for a heated humidifier is much smaller than a passover humidifier.
In our considerable experience of specializing in CPAP equipment we have found that patients who use a heated humidifier have a much higher rate of effectiveness to their CPAP therapy.
There are three types of heated humidifiers:
Stand Alone Humidifiers
Built In Humidifiers
What is a passover humidifier?
A passover humidifier uses a chamber of room temperature water with the CPAP to add moisture to the airflow and reduce irritation to the nasal passages.
Air flows from the CPAP through a short hose to the humidifier chamber where the air "passes over" the water to pick up whatever moisture it can. The air then flows into the six foot hose to the mask.
Passover humidifiers may provide sufficient moisture with CPAPs set at lower-end pressures. However, if the moisture is not sufficient there is no way to increase the amount of moisture added. Furthermore, because the water is room temperature, in cold climates the water temperature will drop causing the CPAP air to become very cold and the amount of moisture will be reduced
What is an integrated humidifier?
An integrated humidifier is used with a specific CPAP and fits directly onto the machine. This eliminates the need for a second hose, and with most heated humidifiers the need for a second power cord.
The advantages of an integrated humidifier are that it works very closely with the CPAP machine and is a compact unit that uses fewer parts.
A disadvantage is that if it is being used as a passover humidifier it will produce less moisture because the surface area is typically smaller. An integrated humidifier will function only with the CPAP for which it was designed.
You can see if your machine has an integrated humidifier option by reviewing our Compare Charts.
A "built in" humidifier is designed as a part of the CPAP machine and cannot be removed or separated from the CPAP machine. As with an integrted humidifier, it eliminates the need for a second hose or power cord. The water chamber can be removed for cleaning or replacement purposes.
The advantage of a "built in" humidifier is it makes for a more compact unit with fewer parts. This design also helps to ensure therapy effectiveness by including the heated humidifier with the CPAP machine thereby providing comfort to the CPAP user.
A disadvantage is that a built in humidifier may produce less moisture if used as passover because the surface area is typically smaller. Also, since the humidifier is "built in" to the machine, detaching it is not an option. This can be an issue for frequent travelers. Lastly, if the machine or humidifier stops working, the entire unit must be sent in for repair or replacement, not just the component that failed.
A stand alone humidifier is a component that will work with any CPAP and does not attach directly to the machine. It has its own power cord and a short hose is used to connect it to the CPAP. Generally it will sit next to the CPAP machine and is slightly larger than an integrated humidifier.
The advantage of a stand alone humidifier is the fact that it may be used with any CPAP machine.
The main disadvantages are that the size is often larger than either a "built in" or integrated humidifier and that a short hose is needed to connect it to the CPAP machine.
Rainout is the accumulation of water in a CPAP tube due to warm moist air cooling and condensating on its way from your CPAP machine to your CPAP mask.
The image below from Fisher & Paykel explains how rainout is formed. Warm moist air leaves the heated humidifier and travels down the CPAP tube. As the air travels down the tube the room temperature can cool the tube and therefore cool the air traveling down the tube. As the air cools, it releases its moisture and condensation occurs, otherwise known as rainout.
Solutions to rainout include:
Raising the temperature of your bedroom.
Keep your CPAP machine at the same level as your bed.
Insulating your tubing with a hose cover like Snugglehose.
Reduce the tempurature setting on your heated humidifier.
Purchasing a CPAP machine with a rainout reduction comfort feature.
Some machine systems offer a compatible heated CPAP hose which maintains the temperature from the machine all the way to mask reducing the occurrence of rainout. The list of available heated hoses can be found here: Hoses With Heating Coils.
To care for your humidifier simply empty and clean the water tank each morning. Only distilled water should be used in the humidifier to avoid mineral deposit build up.
Why do I need to use distilled water with in my humidifier chamber?
Use distilled water to help keep the humidifier chamber clean and mineral deposit free. Tap water should not be used as it will leave hard white mineral deposits in the chamber as the water evaporates, or it may lead to mold growth. Cases of lung disease have been connected to using contaminated well water in a CPAP humidifier.* Source
If distilled water is not available where you live, use bottled water. It will be important to clean the chamber each morning, do not leave standing water the chamber between uses.
What does a humidifier prescription need to say?
Contains one of the following words or phrases "CPAP Humidifier", "Humidifier", "HH", "CPAP Supplies", "CPAP Mask", "CPAP", "Continuous Positive Airway Pressure", "APAP", "AutoPAP", "AutoSet", "Auto CPAP", "Auto Adjusting CPAP", "Self Adjusting CPAP", "BiPAP", "BiLevel", "VPAP", "BiPAP Auto", "BiPAP ST", "Synchrony ST", "VPAP ST"
Contains your physician's contact information
Contains your physician's signature
Contains the patient's full name
Are prescriptions required for mask, machine and/or humidifier purchases?
Yes. Federal law requires we have a valid prescription on file before we ship your mask, machine and/or humidifier.
We provide many easy ways to get your prescription:
We can request your prescription for you! When you checkout, just let us know you would like us to request your prescription, or you can log into your account to have us request your prescription.
Fax your prescription to our Toll Free fax number: 1-866-353-2727, or our international fax number: 713-541-7370