HHZ Respiratory Review

React Health G3 X review: specs and price

3 min read By HHZ Editorial Next review

The React Health G3 X is a full-size auto CPAP with CPAP and AutoCPAP modes, Reslex exhale relief, a built-in heated humidifier (360 mL) with a heated-tube port, an SD card and a cellular modem. It weighs 3.75 lb, works up to 2,300 m (about 7,500 ft) and carries a 5-year device warranty counted from sale to the dealer. It costs $873 (13 Oct 2026), less than the AirSense 11. This review is based on the manual, not hands-on testing.

How we reviewed this: HHZ didn’t test this device hands-on. This review is written from the manufacturer’s user manual and published specifications, linked below, plus a U.S. retail price checked on 13 October 2026. We don’t report comfort, noise or reliability impressions we haven’t measured.

Key specs

SpecReact Health G3 XSource
Price (U.S.)$873cpap.com
ModesCPAP, AutoCPAPG3 X manual
Smart featuresSmartC, SmartA (automatic adjustment of pressure settings)Manual
Exhale reliefReslex (if enabled by your clinician)Manual
Ramp0–60 minManual
HumidifierBuilt in, 360 mL; Off, Auto, levels 1–5Manual
Heated tubeSupported (24 V, 18 W port)Manual
DataSD card; cellular module (LTE Cat M1/NB1)Manual
Sound pressure28 dB(A) at 10 hPaManual
Sound power36 dB(A)Manual
Size265 x 145 x 114 mmManual
Weight1.7 kg (3.75 lb)Manual
AltitudeSea level to 2,300 m (about 7,500 ft)Manual
Operating temperature41–95°FManual
OtherAuto On/Off, iCodeManual
Foam”Foam-free” (manufacturer claim)React Health product page
Warranty5 years device; 3 months accessories, from sale to the dealerManual
IndicationAdults over 66 lb, prescription onlyManual

G3 X vs ResMed AirSense 11

G3 XAirSense 11 AutoSet
U.S. price (13 Oct 2026)$873$1,004
Auto modeAutoCPAPAutoSet
HumidifierBuilt in, heated tube supportedBuilt in, heated tube supported
DataSD card + cellularWireless + SD card; optional myAir app

For AirSense 11 details see AirSense 11 settings.

Strengths on paper

  • Lower price than the AirSense 11 at the retailers we checked.
  • A 5-year device warranty, though it starts at sale to the dealer.
  • Two data paths (SD card and cellular), useful for Medicare compliance.
  • An alternative brand for people replacing a recalled Philips machine (DreamStation alternatives).

Limitations

LimitationDetail
Altitude2,300 m (about 7,500 ft) maximum; check this if you live or travel higher
Warranty startCounted from React Health’s sale to the dealer, so a unit that sat in stock has less left
Comfort settingsReslex and Smart features depend on clinician setup
Data appWe found no patient app comparable to myAir in the documents we read

Verdict

On paper, the G3 X is a capable, lower-cost full-size auto CPAP with a heated humidifier, cellular data and a 5-year warranty. Its main limit is the 2,300 m altitude ceiling. If you live below that and want to save versus the AirSense 11, it’s worth asking your supplier about.

Related: CPAP buyer’s guide, CPAP without insurance cost, CPAP rainout.

Frequently asked questions

Is the React Health G3 X an auto CPAP?
Yes. Its manual lists CPAP and AutoCPAP modes. It also has SmartC and SmartA, which can automatically adjust the treatment or starting pressure based on your breathing. Your clinician decides which mode is enabled.
How heavy is the G3 X?
The manual lists 1.7 kg (3.75 lb) and 265 x 145 x 114 mm (about 10.4 x 5.7 x 4.5 in), with a 360 mL humidifier water tank.
Does the G3 X use foam?
React Health's product page describes the G3 X as foam-free. That's a manufacturer claim; we haven't inspected a unit.
What's the G3 X warranty?
The manual gives 5 years for the main device and 3 months for accessories, counted from the date React Health sold it to the dealer, not from your purchase date.
Can the G3 X send data to my doctor?
The manual describes an SD card and a built-in cellular module (LTE Cat M1/NB1) for transferring therapy data, which matters for Medicare compliance reporting.

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