DREO HM311 4L Ultrasonic Humidifier

Ultrasonic: The DREO HM311 humidifier pairs a 4-liter tank with top filling, touch controls, and an aroma diffuser. Its listed 36-hour runtime and 300-square-foot coverage may suit bedrooms or other modest rooms, while the claimed quiet operation is relevant for overnight use.

At a glance

The listing claims up to 36 hours of operation from the 4-liter tank. Actual runtime can depend on operation settings.
Top-fill design is intended to simplify refilling, and the listing describes the tank as removable for cleaning.
A night light and aroma diffuser add optional ambience. Essential oils are not included, according to the listing.
The manufacturer describes a fine mist and an outlet that produces mist up to 40 inches tall.

Price

$33.99Save 15%

Reference price: ~~$39.99~~

Price checked: Nov 12, 2026

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Often bought together

Breathe Essential Oil Blend 30 ml - Eucalyptus, Menthol for Humidifiers | Breathe Easy Aromatherapy Blend with Eucalyptus, Peppermint, Rosemary and Niaouli Oils for Diffusers - Nexon Botanics

$12.95

Pros and cons

Pros

Top-fill design avoids flipping the tank to refill it, according to the product description.
Touch controls, adjustable humidity control, and a night light are listed.
The 4-liter capacity and stated 36-hour runtime may reduce refill frequency compared with smaller tanks.

Cons

Corded electric power means the unit needs access to an outlet.

Technical specifications

18 specifications

Identity
Brand	DREO
Model	HM311
Model number	DR-HHM001
Type	Humidifier
Operation	Ultrasonic

Capacity and coverage
Tank capacity	4 liters
Listed floor area	300 square_feet
Listed runtime	36 hours

Features and controls
Control method	Touch
Listed features	28dB Ultra-Quiet Operation, Adjustable Humidity Control, Aroma Diffuser, Easy Top-Fill, Night Light
Filter type	Pre Filter

Power
Voltage	120 volts
Power configuration	Corded Electric

Dimensions and finish
Dimensions (D × W × H)	5.51"D x 11.02"W x 10.16"H
Weight	3.1 pounds
Color	White
Shape	Oval
Material	Plastic

What to know before buying

Listing details to confirm

The 36-hour runtime and 300-square-foot coverage are listing claims, not guaranteed results. Runtime and room performance can vary with settings and conditions. The listed wattage is shown as 26 watt-hours, an energy unit rather than a power unit, so confirm the intended power specification if it matters to your purchase.

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

Bedroom users looking for a top-fill ultrasonic humidifier with a night light and touch controls.
Buyers who want a 4-liter tank and a manufacturer-stated runtime of up to 36 hours.
People interested in an aroma diffuser feature and willing to supply their own essential oils.

Less suited to

Shoppers who need a cordless humidifier.
Buyers who require a confirmed power rating in watts or guaranteed room coverage.

DREO HM311 4L Ultrasonic Humidifier · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 18,175 ratings

5 stars74%74%
4 stars11%11%
3 stars4%4%
2 stars3%3%
1 star8%8%

Customer feedback highlights quiet operation, easy cleaning, the night light, and fine-looking mist as positives. Some customers also describe the unit as long-lasting, while others report early failures, so reliability appears to be a meaningful concern. The feedback's favorable comments align with the listed quiet-operation and cleaning features, but do not establish how any particular unit will perform. The strong overall rating distribution is favorable, though it does not resolve the mixed durability reports.