The movement of CPAP air through the air passages can dry out the airway. Humidifiers add moisture to the airstream to help reduce irritation to the nasal passages. Not only are dry air passages uncomfortable, but the swelling can actually narrow the airway affecting therapy pressure requirements. Humidification is the comfort feature most commonly added to CPAP therapy. There are two kinds of humidifiers: cool passover and heated. A cool passover humidifier passes room temperature air over a chamber of room temperature water. A heated humidifier heats water to warm it and as the airstream passes over the heated water it picks up the moisture and warms the air. The heated air is able to hold enough moisture to maintain a comfortable airway.
Humidification adds moisture to the CPAP air, reducing irritation to the nasal passages caused by the increased airflow.
CPAP air is an irritant - to one degree or another - to everyone. In some cases the irritation dries out the nasal passages and may cause bleeding. It may also cause swelling, excess mucous, congestion or sneezing. The irritation may create a very fertile ground for infections to begin. The irritation may be cumulative, building up over time. The only way to reduce the irritation is to add moisture.
Humidification is therefore a critical part of CPAP Therapy.
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.
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:
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
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.
An example of an integrated humidifier is the PR System One Heated Humidifier as seen below attached to a machine in the PR System One line.
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.
An example of a machine with a built in humidifier is the ICON Auto CPAP Machine with Built In Heated Humidifier and SensAwake as seen below.
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.
An example of a stand alone humidifier is the Fisher & Paykel HC150 Heated Humidifier as seen below.
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.
The only care a CPAP or BiPAP machine requires is to clean or change the filters at the air intake. This keeps the internal parts from accumulating dust. Fine paper filters should be changed out every 30 days, or when they appear soiled. Foam washable filters should be rinsed with clear running water once a week, allowed to air dry, and reinserted.
There are some other suggested actions to care for your machine:
Using a heated humidifier on a 12volt battery power source will significantly reduce the amount of power provided. In most cases, usage is reduced to less than half the estimated operational time. CPAPs or BiPAPs requiring inverters reduce the power time even more.
Please note that some heated humidifiers are not capable of being operated on 12volt battery power sources. The later M Series heated humidifiers with the 6'' 'pigtail' connectors are capable of running on 12volt DC power sources. Earlier model M Series heated humidifiers without the pigtail are not 12Volt capable, nor are the Legacy model REMstar and stand-alone H2 humidifiers.
For optimum performance of your battery, plan to use your CPAP without the heated humidifier. You may also have the humidifier connected and filled with water, but without the power turned on. This changes a typical heated humidifier into a passive humidifier.
We suggest testing the battery setup you are planning to use with your machine in advance. To determine the actual amount of power time you will receive and whether or not heated humidification is required for your comfort, test the battery at home before traveling.
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 cools the tube and thereby cools 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:
Cool air holds less moisture than warm air. If warm air from a heated humidifier cools while moving through the CPAP hose, water will condensate inside the hose rather than travel to the user. The condensation that accumulates inside the CPAP hose is referred to as "rainout."
Insulating the CPAP hose will help maintain the moisture in the airflow all the way to the mask.
A hose cover is placed over the hose in order to insulate the hose and to make the hose more comfortable. The simplest and most cost effective way to insulate a CPAP hose is to wrap it in an insulating fabric. This enables the hose to remain flexible and adds little weight.
Companies such as Snugglehose provide a cost effective tubing insulation available in several colors and styles. Not only will the covers reduce or eliminate rainout, they also provide a more personal and less institutionalized appearance. An example of a Snugglehose is shown below.
A heated CPAP hose contains copper coils embedded in, or wrapped around, the hose. These coils are gently heated to conduct a constant temperature throughout the length of the hose. This enhances the comfort of the therapy and reduces or eliminates rainout caused by the water compensating as it travels through the hose to the mask.
Heated hoses are more expensive alternatives to cloth tubing insulation, but they prevent rainout in nearly all cases. The Hybernite Rainout Control System is a stand alone option that can be used with any machine to prevent rainout and increase delivered humidification.
Some manufacturers have developed heated hoses to work specifically with select machines in their product lines. The ClimateLine Tubing is used with S9 and H5i Climate Control System machines.
The following video shows how to install a ClimateLine hose on a S9 Series Machine with H5i Heated Humidifier:
The PR System One Heated Tube is used with PR System One 60 Series CPAP Machines.
The ThermoSmart Heated Hose is used with Fisher & Paykel 600 Series machines.
Yes. Manufacturers have been working on developing ways to reduce rainout and better deliver humidification.
The Hybernite Rainout Control System can be used with any CPAP machine to reduce or eliminate rainout.
ResMed has developed Climate Control technology. The Climate Control system is made up of the combination of the S9 machines, H5i heated humidifier, and the ClimateLine heated tubing. Air is delivered at the temperature requested while five sensors, including one close to the mask, monitor multiple conditions to provide optimal humidification to avoid condensation.
Philips Respironics has developed System One 60 Series Heated Tube Humidity Control technology. System One Humidity Control technology tracks room temperature and adjusts the heat throughout the system to avoid condensation.
Fisher & Paykel has developed Thermostart Technology and Ambient Tracking Technology. Thermostart technology is a unique heated hose which maintains the warm environment for the airflow to prevent condensation. Ambient Tracking Technology monitors the ambient temperature and adjusts heat to maintain the most effective humidification, given the ambient conditions.
Climate Control technology is a rainout reduction feature created by RedMed. The Climate Control system is made up of the combination of the S9 machines, H5i heated humidifier, and the ClimateLine heated tubing. Air is delivered at the temperature requested while five sensors, including one close to the mask, monitor multiple conditions to provide optimal humidification to avoid condensation.
Climate Control Technology Fact Sheet
System One Humidity Control technology is a rainout reduction feature created by Philips Respironics. System One Humidity Control technology analyzes ambient room temperature, relative humidity and patient flow in order to adjust heat to deliver an optimal level of humidification that avoids rainout conditions. The heated tube maintains the humidification all the way from the machine to the mask.
System One Humidity Control Technology
ThermoSmart technology is a rainout reduction feature created by Fisher & Paykel. ThermoSmart technology is a unique heated hose which maintains the warm environment for the airflow to prevent condensation.
With conventional humidification, as air flows from the heated humidifier through the CPAP hose, the surrounding air cools the air inside the CPAP hose. As the air cools, it releases moisture in the tube and mask. The heated hose creates a continuous heated environment to help the air hold its moisture and be delivered effectively to the user.
Conventional Humidification ThermoSmart Technology
Ambient Tracking technology is a rainout reduction feature created by Fisher & Paykel. Ambient Tracking Technology monitors the ambient temperature and adjusts heat to maintain the most effective humidification, given the ambient conditions. The Ambient Tracking Technology uses an auto-adjusting heater plate to maximize humidity delivered while adjusting for room temperature. The level of humidity delivered is dependent on room temperature.
Effects of Ambient Temperature on Humidification
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:
Yes, all CPAP masks and CPAP humidifier chambers either contain BPA or their manufacturer has not released a statement calling their products BPA free. Here is a statement released by Respironics:
Government of Canada Takes Action on Another Chemical of Concern: Bisphenol A
April 25th 2008
To Whom It May Concern
This document represents Respironics' position regarding the use of Bisphenol A in Respironics Sleep and Home Respiratory Devices. On April 18, 2008, the Government of Canada, banned the use of Bisphenol A (BPA) in polycarbonate baby bottles, claiming that the exposure to BPA on newborns and infants up to 18 months of age, could potentially present a health risk to this patient group when the polycarbonate baby bottles are exposed to high temperatures.
At this time, we are able to provide the following information to our customer: NONE of our Sleep and Home Respiratory products which are either breathable or skin contacting are intended for use with newborns or infants under 18 months of age. Therefore, Respironics is in compliance with Health Canada's position for exposure for the identified at risk patient population.
Although Health Canada's restriction for BPA does not include products used for ages above 18 months at this time, Respironics is evaluating its product portfolio and will take the appropriate actions to determine and mitigate any potential risk from use of its products or potential exposure to BPA. It should be noted that NOT all polycarbonate resins contain BPA. In response to the direction provided by Health Canada's device licensing division, Respironics will be evaluating all of our Class II and III medical devices to determine if the resins used in the manufacturer of its products contain BPA.
Further, none of our products or accessories using polycarbonate are labeled for exposure.
In closing it is Respironics position that our products do not pots any increased risk of exposure to BPA for our users and thus our products remain safe for use.
If you have any further question regarding this topic, please feel free to contact me at firstname.lastname@example.org or at 724-387-4120.
Zita Yurko Director, Regulatory Affairs Sleep and Home Respiratory Division Respironics, Inc.