Dreo HM717S 8L smart humidifier: warm and cool mist for large rooms

The Dreo HM717S (model DR-HHM007S) is a large smart humidifier with an 8-litre tank that can produce warm or cool mist. Dry indoor air is common in heated homes in winter, and a humidifier of this size is meant to raise the humidity across a big room without constant refilling.

Warm and cool mist

You can switch between warm and cool mist. Dreo says warm mist reaches 133°F in 8 minutes, and that the unit raises relative humidity (RH) by 18% in 20 minutes. Warm mist is often preferred in cold months, while cool mist suits everyday use. Results vary with the room size, the starting humidity and air leakage.

Output and coverage

Dreo rates the mist output at 550 ml/h and says the mist column is 40 inches tall and 4 inches wide. It rates the unit for rooms up to 600 sq. ft. (about 56 square metres). Mist output is the amount of water the unit puts into the air per hour, so a higher figure suits a bigger space.

Tank and runtime

The 8L tank gives up to 80 hours of continuous running, according to Dreo, so refills are less frequent. The tank fills from the top. Dreo quotes 28 dB for the noise level, a figure that is generally comparable to a quiet whisper, and the mist's real-world noise depends on the mode.

Humidity control

A humidistat measures the room's humidity and holds a target within a 5% tolerance, and auto mode adjusts the output to keep it there. Holding a steady level is better than running at full output, as too much humidity can lead to damp surfaces. Many guides suggest keeping indoor humidity moderate.

App and voice control

The DREO app shows real-time humidity, sets schedules and shows reports. Alexa and Google Home voice control are listed.

Extras

The humidifier also diffuses essential oils and has ambient light. Dreo notes an optional demineralization cartridge that fits the tank, searched under that name. Check the manual about where oils go, since the wrong place can damage a unit.

What to check before you buy

• Room size: compare your room with the 600 sq. ft. coverage figure.
• Space: it measures about 6.7 x 12.0 x 14.4 inches and weighs 6.9 lb empty; check the surface and clearance.
• Cleaning: humidifiers need regular cleaning and fresh water; see the manual for the routine and descaling.
• Water: hard water leaves mineral deposits, so check the cartridge and water recommendations.
• Warm mist: heated mist needs a stable surface, out of reach of children and pets.
• Wi-Fi: the app and voice features need a home network.

The short version

• An 8L top-fill humidifier with warm and cool mist.
• 550 ml/h output, rated for rooms up to 600 sq. ft.
• Up to 80 hours per fill and 28 dB, according to Dreo.
• Humidistat with auto mode, app, Alexa and Google Home control.
• Essential oil diffusion and ambient light.

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