null

3B Medical Luna G3 Auto Machine With Heated Humidifier

(1 review) Write a Review
SKU:
LG3600
$1,034.00
$754.00 $754.00
Prescription Not Required
Standard Nationwide Shipping

Please note that the product will not be shipped until you upload a prescription. Prescription Policy

Our Price: $754.00  Original Price: $1,034.00  You save $280

The Luna G3 Auto from React Health, the company formerly known as 3B Medical, prioritizes comfort and efficiency, as shown by its included heated tubing, PM2.5 air filter, auto ramp functionality, and built-in accessory and supply reminders. This auto-adjusting positive airway pressure (APAP) device intuitively changes your pressure settings as needed, so you can get a good night's sleep no matter your pressure needs.

Key Features

  • Small footprint that won't clutter your nightstand
  • A great option for allergy sensitivities
  • Comfort controls to preheat your humidifier and help prevent rainout
  • Auto ramp feature that makes adjustments while you sleep
  • Quiet operation that won't disturb you or your partner
  • Easy-to-access reports and supply reorder reminders
  • Tracks and stores data for you and your doctor
  • 60 day satisfaction guarantee on qualifying mask and machine purchases

Why Choose the React Health Luna G3

Sleep Peacefully While Auto Ramp Handles the Adjustments

The auto ramp function on the G3 senses when you're about to fall asleep and adjusts pressure accordingly. As you sleep, it continues making adjustments if it detects changes in your airflow. Ramp time ranges from 0 to 60 minutes, so you can ease into your prescribed pressure gradually and fall asleep comfortably.

Comfort Controls to Preheat Your Humidifier and Help Prevent Rainout

With a simple tap of the screen, you can turn on the integrated preheat setting, which warms your humidifier before you get into bed. The device also includes AutoHumidity control alongside its heated hose, helping prevent rainout even at your highest moisture setting.

Quiet Operation That Won't Disturb You or Your Partner

At a pressure of 10 cm H2O, the G3 APAP machine operates at less than 28 decibels, quieter than a whisper.

A Small Footprint That Won't Clutter Your Nightstand

At under 4 lbs, this machine is also easy to pack and bring along if you want to use it as a travel CPAP machine. 

A Great Option for Allergy Sensitivities

If you struggle with seasonal allergies, dust, or pet dander, the Luna G3 APAP comes with a hypoallergenic PM2.5 filter, one of the most efficient, highest-arresting air filters available on any CPAP machine. Paired with the included heated tubing, the Luna G3 delivers some of the cleanest, most consistently heated therapy air you can get.

Easy-to-Access Reports and Supply Reorder Reminders

The user-friendly screen gives you quick access to your personal CPAP settings and nightly sleep reports, which can help cut down on how often you need to check in with your doctor. In standby mode, the display shows the time, temperature, and humidity level at a glance. The G3 also lets you know when it's time to replace your air filter or mask, so your equipment stays performing at its best.

Tracks and Stores Data for You and Your Doctor

Using WiFi, you can store and send your sleep therapy progress from an SD card or your smartphone, making it simple for your doctor to see whether your pressure prescription is working or needs an adjustment.  And, with the React Health Plus App you can take your compliance data with you wherever you go. Once the app has been downloaded to your device; simply scan the iCodeQR that is generated on your Luna device. Within seconds a summary of your compliance data is saved into your app and is accessible whenever you need it!

What's Included

  • Luna G3 APAP machine
  • Heated tubing
  • Standard tubing
  • 1 standard air filter
  • 1 PM2.5 air filter
  • Power supply and cable
  • Carrying case
  • SD card
  • User manual

Specifications

Sound level 26 dBA
Dimensions 10.4" L x 5.7" W x 4.5" H
Weight 3.75 lbs
Warranty 2 years
Voltage 100 to 240V, 50Hz/60Hz, 2A
Humidification Yes, integrated
Heated hose option Yes
Exhalation relief Yes
Ramp mode Yes, 0 to 60 minutes
Battery option Yes (travel battery sold separately)
Compliance data
Yes
Advanced data
Yes
Phone/web app available
Yes
Auto start
Yes
Auto stop
Yes

Who the Luna G3 Is Best For

  • Allergy sufferers who want cleaner, filtered therapy air
  • People starting CPAP therapy for the first time
  • Veteran CPAP users who want a compact, quiet upgrade

Compare the Luna Lineup

The Luna G3 is React Health's most popular mid-tier auto CPAP machine. If you would like a more affordable option, see the Luna II (G2) Auto CPAP Machine with Humidifier. If you would like the newest model, with a touchscreen display and a 5 year warranty, see the Luna G3X Auto CPAP with Humidifier.

Frequently Asked Questions

Do I need a prescription to buy the Luna G3?

Yes. CPAP and APAP machines are regulated medical devices, so a valid prescription from a licensed healthcare provider is required to complete your purchase.

H3: Is 3B Medical the same company as React Health?

Yes. 3B Medical rebranded as React Health, so you may see this same machine listed under either name. It is the same product either way.

What model number is the Luna G3 Auto?

The auto-adjusting Luna G3 APAP is model LG3600. The fixed-pressure Luna G3 CPAP is a separate model, LG3500.

What's the difference between the Luna G3 and Luna G3X?

The Luna G3X is React Health's newer model, with a touchscreen display, a redesigned foam-free chassis, and a 5 year warranty. The Luna G3 uses a dial and LCD screen and carries a 2 year warranty, at a lower price point.

What is the warranty on this machine?

The Luna G3 Auto CPAP Machine includes a 2 year manufacturer's warranty.

Safety Information

This device is intended for adult use only and is not intended for life support. The instructions provided with this device are not intended to supersede established medical protocols.

  • Do not bring the device or accessories into a Magnetic Resonance (MR) environment.
  • Do not use the device or accessories near electromagnetic equipment such as CT scanners, diathermy, RFID, or electromagnetic security systems (metal detectors), as this may create risk to the patient or damage the device.
  • If the device has been dropped or mishandled, if the enclosure is broken, or if water has entered the enclosure, disconnect the power cord and stop use immediately, then contact your home care provider.
  • If the room temperature is warmer than 95°F (35°C), the airflow produced by the device may exceed 109.4°F (43°C). Keep the room temperature below 95°F (35°C) while using the device.
  • Always place the device where its screen and indicators remain clearly visible.
  • If the device has been exposed to very hot or very cold temperatures, allow about 2 hours for it to adjust to room temperature before setup.
  • Keep the device away from heating or cooling equipment, such as forced air vents, radiators, or air conditioners.
  • This device is not suitable for high humidity environments. Do not allow water to enter the device.
  • Make sure bedding, curtains, or other items do not block the device's filter or vents.
  • Keep pets, pests, and children away from the device, and avoid small objects being inhaled or swallowed.
  • To avoid explosion, do not use this device in the presence of flammable gases, such as anesthetics.
  • Tobacco smoke may cause tar buildup inside the device, which can lead to malfunction.
  • Air must flow freely around the device for it to work properly.

1 Review Hide Reviews Show Reviews

  • 4
    luna g3 pap

    Posted by Morgan Daffy on May 11th 2026

    I really like the luna g3. It’s quiet and easy to use and the heated tubing makes a big difference. The reminders for supplies are helpful because I’m terrible at keeping track of that stuff. I’m giving it 4 stars only because it’s not the smallest machine, but overall it’s been quite reliable and has helped me sleep better.