Is the Dreo 311S worth it at $49.99?

At $49.99 it is a low entry price for a 4L humidifier with app and voice control. You get top-fill cleaning and a 36-hour runtime, but budget for a demineralization cartridge if your water is hard.

How long does the 4L tank last?

Dreo rates it at up to 36 hours on low output. At the full 250 mL/h mist rate, expect closer to 16 hours per fill.

Does it work with Alexa and Google Assistant?

Yes. It connects over Wi-Fi and supports both, plus touch controls and the Dreo app for schedules and humidity targets.

What comes in the box?

The humidifier, a user guide, a cleaning brush and an aroma pad. Essential oil and the demineralization or clean-mist cartridge are not included.

What size room does it cover?

Dreo rates it for rooms up to 300 sq ft, which suits a bedroom, nursery or small living room. Larger open spaces will need a second unit or a bigger model.

Why is there white dust around it?

Ultrasonic mist carries minerals from hard tap water. Use distilled water or the optional demineralization cartridge to reduce it.

Where is the Humidifier 311S cheapest?

At DREO, for $49.99, as of our latest check.

Dreo

Humidifier 311S

Best price now

$49.99at DREOObserved at 8:25 PM

Prices are checked against each store and labelled with when.

Visit DREO

Ask our shopping agent

Dreo

Humidifier 311S

Best price now

$49.99at DREOObserved at 8:25 PM

Prices are checked against each store and labelled with when.

Visit DREO

Ask our shopping agent

Our take on the Humidifier 311S

The Dreo 311S is a 4L top-fill ultrasonic cool-mist humidifier rated for rooms up to 300 sq ft. It runs up to 36 hours per fill at a 250 mL/h output, holds humidity within ±5%, and adds app, Alexa and Google control plus 1,500+ RGB light options. It sits at $49.99 at DREO as of November 4, 2026, the only new price listed, so there is no recent range to compare against.

Best forBedrooms and nurseries up to 300 sq ftBuyers who want app and voice control at a low pricePeople who want a top-fill tank that is easy to cleanAnyone who likes adjustable ambient lighting

Pros

Top-fill 4L tank is simple to refill and wipe down
Runs up to 36 hours per fill at 250 mL/h
Quiet at a rated 28 dB
±5% humidity control with on-unit humidity indicators
Works with Alexa, Google Assistant and the Dreo app
Built-in aromatherapy pad slot

Cons

Demineralization and clean-mist cartridges are sold separately
Essential oil not included
RGB lighting is a novelty some will never use
Ultrasonic cool mist can leave white dust with hard water

Humidifier 311S prices at every store

DREONew
In stockReturn policy
$49.99Observed at 8:25 PM
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Humidifier 311S price history

Lowest price we've seen: $49.99 on Nov 4 at DREO. Tracked across 1 store since Nov 4.

From DREO

4L tank with up to 40 hours max runtime
±5% precise humidity control with humidity indicators
1500+ customizable RGB lights in the DREO App
Top-fill design for easy cleaning
Built-in aromatherapy (essential oil not included)
Compatible with Demineralization or Clean-Mist Cartridge (not included)

Guarantee: All new DREO products are covered against material defects and workmanship for 12 months from the date of purchase; refurbished or second-hand products are not
Returns: Return your undamaged product within 30 days for a full refund; for non-defective returns the buyer pays return shipping.
Shipping: Fast, free shipping across the US (restrictions may apply); estimated delivery in 3-7 business days; accessory items may incur an additional shipping fee.
In the box: 1x Humidifier 311S, 1x User Guide, 1x Cleaning Brush, 1x Aroma Pad

About the Humidifier 311S

4L Tank, 40H Max Runtime

• ±5% Precise Humidity Control & Humidity Indicators

• 1500+ Customizable RGB Lights in DREO App

• Top-Fill Design, Easy-to-Clean

• Built-In Aromatherapy (Essential Oil Not Included)

• Compatible with Demineralization or Clean-Mist Cartridge (Not Included)

Specifications

Coverage Area: 300 sq ft coverage
Depth: 5.51 in deep
Water tank capacity: 4LSource
Runtime: 36HSource
Coverage: 300 ft²Source
Noise level: 28dBSource
Mist type: Ultrasonic ｜ Cool MistSource
Smart control: App, Voice, TouchSource
Mist height: 40"Source
Particle diameter: 5µmSource
Mist output: 250mL/hSource
Dimensions: 14 x 28 x 25.8cmSource
Net weight: 1.42kgSource
Smart home compatibility: Alexa and Google AssistantSource

Questions and answers

Is the Dreo 311S worth it at $49.99?: At $49.99 it is a low entry price for a 4L humidifier with app and voice control. You get top-fill cleaning and a 36-hour runtime, but budget for a demineralization cartridge if your water is hard.
How long does the 4L tank last?: Dreo rates it at up to 36 hours on low output. At the full 250 mL/h mist rate, expect closer to 16 hours per fill.
Does it work with Alexa and Google Assistant?: Yes. It connects over Wi-Fi and supports both, plus touch controls and the Dreo app for schedules and humidity targets.
What comes in the box?: The humidifier, a user guide, a cleaning brush and an aroma pad. Essential oil and the demineralization or clean-mist cartridge are not included.
What size room does it cover?: Dreo rates it for rooms up to 300 sq ft, which suits a bedroom, nursery or small living room. Larger open spaces will need a second unit or a bigger model.
Why is there white dust around it?: Ultrasonic mist carries minerals from hard tap water. Use distilled water or the optional demineralization cartridge to reduce it.
Where is the Humidifier 311S cheapest?: At DREO, for $49.99, as of our latest check.