# 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.

- [Original product page](https://best-deals.pro/product/dreo-hm311-4l-ultrasonic-humidifier)
- [View offer](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- Market: US
- Language: en-US
- Currency: USD
- Brand: DREO
- Model: HM311
- Category: Home & Kitchen > Heating, Cooling & Air Quality > Humidifiers & Dehumidifiers
- Price: 33.99 USD
- Previous price: 39.99 USD
- Discount: 15%
- Price checked: 2026-11-12T11:03:11.402Z
- Rating: 4.4 / 5
- Reviews: 18175

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## 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

## Before you buy

- 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.

## In the box

- Aroma pad (Included)
- Cleaning brush (Included)
- Cleaning guide \(1\) (Included)
- Humidifier \(1\) (Included)
- User manual (Included)

## 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.

## Customer feedback

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.
- Positive themes: Customers praise quiet operation and simple cleaning.
- Positive themes: The night light and fine mist receive positive feedback.
- Mixed feedback: Durability and reliability feedback is mixed, with reports ranging from long use to failure after a short period.

## Frequently asked questions

### How large is the HM311 tank?
The listing gives a capacity of 4 liters.
### How long is its stated runtime?
The listing claims up to 36 hours. Treat this as a maximum claim, since actual runtime may vary with settings and conditions.
### Does it support aroma diffusion?
An aroma diffuser feature is listed. The description says essential oils are not included.
### What room size does the listing specify?
It lists coverage of 300 square\_feet. This is a manufacturer claim, not a guarantee of performance in every room.

## Alternative options

- [DREO Smart Humidifiers for Bedroom, 4L Cool Mist Humidifier \| Top Fill, Quiet Sleep 28 dB, 36H Runtime for large room, Touch/APP/Voice Control, Nightlight, ideal for Baby, Plants, Nursery](https://best-deals.pro/visit/dreo-smart-4l-cool-mist-humidifier)
- [DREO 6L Smart Humidifiers for Bedroom, Large Room, 60H Runtime, Quiet 28dB \| Top Fill Supersized Cool Mist Humidifier for Plants, Indoor, Home, Night Light, App/Touch/Voice Control, Ebony](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [DREO 11L Smart Humidifier Large Room 700 ft², 100H Runtime, 21dB Quiet 747S \| Top Fill, 1500+RGB Light, APP & Remote Control, Clean Tank Technology, 12H Timer, Cool Mist Humidifiers for Bedroom, White](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [DREO 8L Smart Humidifier Large Room, 80H Runtime, Cool & Warm Mist, HM717S \| Up to 600ft², Precise Humidity Control, 1500+RGB Light, 28dB, Humidifiers for Bedroom, Plants, Baby, Supports APP/Voice/Alexa](https://best-deals.pro/visit/dreo-hm717s-8l-smart-warm-cool-mist-humidifier)
- [Levoit Humidifiers for Bedroom, Smart Warm and Cool Mist, Symptom Relief \| OasisMist 4.5L Top-Fill Tank Runs 45H, Large Room, Auto Customized Humidity, 26dB Quiet, Essential Oil, Easy to Clean, White](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [MEGAWISE 6L Top Fill Cool Mist Humidifier for Bedroom and Plants \| Ultrasonic operation, under 28 dB\(A\), rotary mist control, low-water mist stop, tank light, corded household use](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [DREO 6L Smart Humidifiers for Bedroom, Warm & Cool Mist for Large Room \| 60-Hour Quiet Runtime, 500ML/H Output, Smart Humidity Sensor, Indicator Light, App Control, Works with Alexa & Google, Silver](https://best-deals.pro/visit/dreo-dr-hhm003s-6l-smart-warm-cool-mist-humidifier)
- [Vicks Warm Mist Humidifier for Medium to Large Rooms, 1 Gal Tank \| Filter-free humidifier supports easier breathing at night, quiet operation, auto shut-off, suitable as a nursery humidifier](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [DREO 6L Humidifiers for Bedroom, 60H Runtime, 28 dB Quiet, HM524 \| Precise Humidity Control, Easy to Refill & Clean, Nightlight, Cool Mist Humidifiers for Large Rooms, Baby Nurseries & Plants](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [Vicks Filter-Free Ultrasonic Humidifier for Bedroom or Nursery 1.2 Gal Tank \| Room humidifier for bedroom or nursery, recommended by pediatricians, provides quiet comfort and cool mist](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [KZF Humidifiers for Bedroom, 4L Cool Mist Humidifier for Large Room, Black \| 40H Runtime, Top Fill, 2-in-1 Oil Diffuser & Air Humidifier for Baby, 28dB Quiet, Humidity Display & Control, Auto Shut-off](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)
- [Levoit Humidifiers for Bedroom Large Room, 6.2L Tank, Smart App, Quiet 26dB \| Top Fill Cool Mist Humidifier for Baby & Plants, Easy to Clean, 62H Runtime, Essential Oil, Precise Humidity Control](https://best-deals.pro/visit/levoit-neoclassic-650s-smart-ultrasonic-humidifier)

## Add-ons

- [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](https://best-deals.pro/visit/dreo-hm311-4l-ultrasonic-humidifier)

## Images

![DREO HM311 4L Ultrasonic Humidifier — 1](https://best-deals.pro/i/fk4dzRP9BUrVly9CfSaNGhwOY5coXGWYWCb4p9Uoqs3taIDEqjlozSqXPOeVysfZmDbim2LeLUPnUZeG7u740LS_6NEhK_qza7fgnvtNUCn4c2_axpDaQj_3.jpg)

![DREO HM311 4L Ultrasonic Humidifier — 2](https://best-deals.pro/i/V4bK-66NNdeOBxEDPA3lZbpIvEbHjH7WPxAnCgBS0XONi0ZQhSo22H9MEAReNx06p8gUu_xEpnM3t2yGYbUmPnGE9DSi99FSimfCnLxpsPCA6BL7RUq5BXok.jpg)

![DREO HM311 4L Ultrasonic Humidifier — 3](https://best-deals.pro/i/Z7uiXZnr_b0paw9VIVyN1EOGcZ0gK0MNsk6xeNd81yUbXmSXZQe7_L0AouYQLfOtIwGycFYnlnQGB6rGxmNZ-vS4OfYzmQemHUl_jYUFaszu9QZdTMvjYz6i.jpg)

![DREO HM311 4L Ultrasonic Humidifier — 4](https://best-deals.pro/i/AV5goUikUQ6PZOB0l2Pth_za8ioBtDA02fUgtSvSX2CSRHDNNfELcKhvQFcSVPOtorsQiYkt0Ib1SeUD11kB75Z8BOH_pI32b4x3X0xmRklrwMqE3xUsTShy.jpg)

![DREO HM311 4L Ultrasonic Humidifier — 5](https://best-deals.pro/i/BT1ibXWIpmQJwZ5VOTR9dJ5h2uLZ5oWd0KxgNOPZvn1zcmHDir2VtbTgmhLHjjZxG3swJT2RipUyZAzAx0s8VAlUdYJ_GoPQFf5cMXuzNdfxSsBxgNuzAiXy.jpg)

![DREO HM311 4L Ultrasonic Humidifier — 6](https://best-deals.pro/i/OJ-hH3YHplpwDGxP_WZme5LqDLvimx9ZGPxTJFc-QBzjHbOWveGH8N_Mtb252WQ8xphmI__Uj3Mkc5UWgMvEZN70oNWhNpVphPpxms4eCvkTR2pu9KZFR0Vb.jpg)

![DREO HM311 4L Ultrasonic Humidifier — 7](https://best-deals.pro/i/qZe3ID28XloVhza7fX5mzpcq4hAkkUgEpA43QWQo5ULUUBtawCLZ9AVqpoFBEknKfrkwIEAxboZgzgUzWgSolmfEaUAJYJB3xdRw_YzyPrXNgvUvz5HSEdL_.jpg)