React Health
3B Medical Luna G3 Auto-CPAP with Heated Humidifier
Auto-adjusting pressure, an integrated heated humidifier with pre-heat, heated tubing, and app-based sleep scores — complete premium sleep therapy at an outlet price.
- Auto-CPAP pressure (4–20 cm H₂O) adjusts breath-by-breath all night
- Integrated heated humidifier with pre-heat and 360 ml easy-fill chamber
- Heated tubing eliminates condensation "rainout" year-round
- RESlex exhalation relief (3 levels) for natural breathing
- Leak detection with on-screen and audible alerts
- Nightly sleep score + React Health Plus app via iCode QR sync
Everything about the Luna G3 Auto-CPAP
Therapy that tunes itself while you sleep
The Luna G3 monitors your breathing all night and continuously adjusts pressure to the minimum effective level — more support during events, gentler airflow the rest of the night. You sleep; the machine does the math.
Humidity without the hassle
A heated humidifier is built directly into the chassis — no bulky add-ons. The pre-heat function warms the 360 ml chamber before bed, the reservoir lifts out for easy filling and cleaning, and integrated heated tubing prevents the condensation that plagues cold bedrooms.
Comfort engineering in every breath
RESlex exhalation relief senses your rhythm and drops pressure slightly as you breathe out, across three adjustable intensity levels. A 0–60 minute ramp eases you into therapy, and automatic altitude adjustment keeps pressure accurate wherever you sleep.
Know how you slept — every morning
Wake to a 0–100 sleep score with usage time, mask-seal quality, and respiratory event counts on the color display. Scan the on-screen iCode QR with the free React Health Plus app (iOS/Android) to sync full compliance reports for yourself or your physician.
Maintenance reminders built in
Set replacement reminders for masks, tubing, and filters at 30, 60, 190, or 365-day intervals and the Luna G3 will tell you when supplies are due — one less thing to track.
Full specifications (16 data points)
Physical
| Dimensions | 10.43 in × 5.71 in × 4.49 in |
|---|---|
| Weight | ≈5 lbs |
| Noise level | 26.6 dBA |
Therapy
| Mode | Auto-CPAP / CPAP |
|---|---|
| Pressure range | 4–20 cm H₂O |
| Ramp | 0–60 minutes |
| Exhalation relief | RESlex, levels 1–3 |
| Altitude adjustment | Automatic |
Humidification
| Humidifier | Integrated, heated, with pre-heat |
|---|---|
| Chamber capacity | 360 ml to max fill line |
| Tubing | 6 ft heated tubing included |
Data & alerts
| Leak detection | Audible + on-screen alert after 40 s |
|---|---|
| Usage score | Nightly 0–100 score with event breakdown |
| Data | SD card + React Health Plus app (iCode QR) |
| Supply reminders | 30 / 60 / 190 / 365-day intervals |
| Prescription required | Yes |
Frequently asked questions
Does the Luna G3 include a mask?
No — masks are prescribed and sized individually. The included Size Guide PDF helps you choose; our team can recommend compatible masks with your order.
Auto-CPAP vs fixed CPAP — which will it run?
Both. It ships in auto-adjusting mode (4–20 cm H₂O) but can be set to a fixed prescribed pressure by you or your provider.
Is it quiet enough for a shared bedroom?
At 26.6 dBA it is one of the quietest machines on the market — most partners report they can’t hear it over normal room noise.
Questions about this product?
Get instant answers about specs, shipping, prescriptions, and warranties — or reach a human respiratory specialist who knows this machine inside out.
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