DREO HM311 Ultrasonic Cool-Mist Humidifier, 4 L

The DREO HM311 is a top-fill ultrasonic cool-mist humidifier with a 4 L tank and claims of up to 32 hours of runtime. Its listed features include touch controls, adjustable humidity control, an aroma diffuser and a night light, making it worth considering for a room within the stated coverage.

At a glance

Top-fill design is intended to let you refill the tank without turning it over.
The manufacturer claims up to 32 hours of operation from the 4 L tank.
Aroma-pad and night-light functions add options beyond humidification. The listing says essential oils are not included.

Price

$47.49Save 21%

Reference price: ~~$59.99~~

Price checked: Nov 12, 2026

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Pros and cons

Pros

Top filling and a removable modular design are presented as convenient for refilling and cleaning.
Adjustable humidity control, touch controls and a night light provide several listed operating options.
An aroma pad is listed among the included components.

Technical specifications

14 specifications

Identity and operation
Brand	DREO
Model	HM311
Operation mode	Ultrasonic
Listed capacity	4 liters
Listed runtime	32 hours
Listed coverage	300 square_feet
Colour	White
Filter type	Pre Filter

Controls and features
Control method	Touch
Special features	28dB Ultra-Quiet Operation, Adjustable Humidity Control, Aroma Diffuser, Easy Top-Fill, Night Light
Power source	Corded Electric
Voltage	120 volts

Dimensions and installation
Dimensions listed	31.5D x 18W x 31.5H centimetres
Weight listed	1.42 kg

What to know before buying

Listing details to confirm

The listing title says 36 hours, while the specifications and feature text say 32 hours. Treat runtime as unconfirmed and check the selected listing before relying on either figure. The listing also claims up to 300 square_feet of coverage and 28dB operation, which are manufacturer claims, not independently verified measurements. Its voltage is listed as 120 volts.

What’s in the box

Included

Aroma pad
Cleaning brush
Cleaning guide, 1
Humidifier, 1
User manual

Who is it for?

A good fit for

People looking for a top-fill cool-mist humidifier with a 4 L tank for a room within the stated 300 square_feet coverage.
Buyers who want listed humidity adjustment, touch controls, an aroma function and a night light.

Less suited to

Buyers who need a confirmed 36-hour runtime or a verified room-coverage measurement.
People seeking a cordless humidifier.

DREO HM311 Ultrasonic Cool-Mist Humidifier, 4 L · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 15,161 ratings

5 stars70%70%
4 stars13%13%
3 stars6%6%
2 stars3%3%
1 star8%8%

Customer feedback highlights quiet operation, humidity control, ease of cleaning and mist output as strengths, with mixed opinions about auto shut-off. For buyers considering the listed top-fill design and adjustable humidity control, the reported ease of cleaning and control are relevant, but feedback does not establish a specific auto shut-off outcome. Aggregate ratings skew positive, though they do not explain individual experiences.

Positive themes

Customers describe operation as quiet.
Feedback speaks positively about humidity control, ease of cleaning and mist output.

Mixed feedback

Customer opinions about auto shut-off are mixed.

Frequently asked questions

How long does the DREO HM311 run per fill?

The title claims 36 hours, but the specification and feature text state 32 hours. The runtime is therefore inconsistent in this listing and should be confirmed for the selected offer.

What room size does the listing specify?

It lists coverage of 300 square_feet. This is a manufacturer claim, not an independently verified coverage result.

Can it be used with essential oils?

The listing describes an aroma-diffuser function and says essential oils are not included. An aroma pad is listed as included.

What is reported about customer experience?

Customer feedback describes quiet operation, humidity control, cleaning and mist output positively, while opinions about auto shut-off are mixed. That mixed feedback may matter to buyers who expect that function to be dependable.