OVERALL

SPECS

VS AVERAGE

REVIEWS

ALTERNATIVES

Dreo Smart Humidifier HM524S 6L Review | 43 Data compared

Avg. price in UK: ~£55
Avg. price in US: ~$60
Humidification rate: 300 ml/h
Maximum room area: 46.45 m²
Water tank capacity: 6 L
Maximum operating time: 60 hours
Maximum noise level: 32 dB

Dreo Smart Humidifier HM524S 6L review. Compare 43 technical specifications and user reviews to see how this product ranks in the Humidifiers category and whether it is worth buying.

8.5

Excellent

8.3

Excellent

9.2

Exceptional

9.1
Bedroom use
Score components:
35.0%
7.5
Maximum noise level
25.0%
10
Maximum operating time
20.0%
10
Timer
20.0%
10
Automatic low-water shut-off
8.5
Large rooms
Score components:
35.0%
7.4
Humidification rate
30.0%
8.1
Maximum room area
25.0%
10
Water tank capacity
10.0%
10
Hygrostat
8.2
Plant care
Score components:
30.0%
10
Hygrostat
25.0%
7.4
Humidification rate
25.0%
10
Water tank capacity
20.0%
4.0
360° nozzle

Best prices in UK

Best rankings

Verdict

The Dreo Smart Humidifier HM524S is a 6-liter ultrasonic cool mist humidifier designed to cover rooms up to 500 square feet with a maximum mist output of 300 ml/hour and a 40-inch tall, 5 μm ultra-fine spray. Its standout features include a Next-gen Auto Mode that tracks and maintains a user-defined humidity level within a precise ±5% margin, a top-fill water tank offering up to 60 hours of continuous runtime, an integrated aromatherapy tray, and built-in smart functionality compatible with the Dreo app, Amazon Alexa, and Google Assistant. Users praise its ultra-quiet 28dB operation, easy-to-clean modular design, and a customizable 3-color RGB humidity indicator light. However, its primary drawbacks are that it lacks a warm mist option, is limited to a single cool-mist output type, and its large 6-liter footprint may be too bulky for standard desks or compact nightstands.

Technical Specifications of humidifier Dreo Smart Humidifier HM524S 6L

Overall score

8.5

Show more

Hide

Popularity

What it is: An indicator based on the number of reviews received by products in the Humidifiers category.

When it matters: When you prefer products in the Humidifiers category that have been chosen and reviewed by many other buyers.

Performance

8.8

Show more

Hide

Technology

What it is: The method the humidifier uses to turn water into moisture for the room.

When it matters: Technology affects mist temperature, visible output, maintenance needs, and sensitivity to minerals in the water.

Importance: LOW

ultrasonic

Humidification rate

What it is: The maximum amount of water the humidifier can release into the air per hour.

When it matters: A higher rate raises room humidity faster and is more useful in dry or larger spaces.

Importance: HIGH

Good value: At least 300 ml/h

Maximum room area

What it is: The largest room floor area the humidifier is recommended to cover.

When it matters: A larger coverage rating is important for open-plan spaces and larger bedrooms or living rooms.

Importance: HIGH

Good value: At least 40 m²

Water tank capacity

What it is: The usable amount of water the humidifier’s reservoir can hold.

When it matters: A larger tank generally needs fewer refills and can support longer operation between top-ups.

Importance: HIGH

Good value: At least 4 L

Maximum operating time

What it is: The longest stated operating time from one full water tank.

When it matters: Longer runtime means fewer refills during overnight use or extended daily operation.

Importance: HIGH

Good value: At least 24 hours

Show more

Features

8.4

Show more

Hide

Warm mist function

What it is: Indicates whether the humidifier can produce warm mist as well as cool mist.

When it matters: Useful when you want warmer output in cool weather instead of cool mist alone.

Importance: HIGH

Good value: yes

Aromatherapy support

What it is: Indicates whether the humidifier supports the safe use of aromatic oils or fragrance media.

When it matters: Useful if you want to add fragrance without putting oil directly into the water tank.

Importance: MEDIUM

Good value: yes

Dedicated aroma compartment

What it is: Indicates whether the humidifier has a separate compartment for aroma pads or essential oils.

When it matters: A dedicated compartment keeps fragrance media separate from the main water tank.

Importance: LOW

Good value: yes

Automatic low-water shut-off

What it is: Indicates whether the humidifier switches itself off when the water level becomes too low.

When it matters: This safety feature helps prevent the unit from continuing to run with an empty tank.

Importance: HIGH

Good value: yes

Water level indicator

What it is: Indicates whether the humidifier shows the amount of water remaining in its tank.

When it matters: A visible level indicator makes it easier to know when the tank needs refilling.

Importance: MEDIUM

Good value: yes

Show more

Design

6.3

Show more

Hide

Fill type

What it is: The design mechanism used to add water to the humidifier tank, distinguished primarily between convenient top-fill and inverted bottom-fill designs.

When it matters: Top-fill humidifiers let you pour water directly into the top with a pitcher without carrying a heavy, dripping tank to the tap.

Importance: LOW

top fill

Color

What it is: The primary exterior color of the humidifier.

When it matters: Color matters when you want the humidifier to blend with the room.

Importance: LOW

white

Material

What it is: The primary material used for the humidifier’s exterior housing.

When it matters: Material matters for durability, feel and appearance.

Importance: LOW

plastic

360° nozzle

What it is: Whether the humidifier has a nozzle that rotates through 360° to direct the mist.

When it matters: A rotating nozzle helps redirect mist without moving the humidifier.

Importance: LOW

Good value: yes

Display

What it is: Whether the humidifier has a display for settings and status information.

When it matters: A display makes humidity, mode and timer information easier to check.

Importance: LOW

Good value: yes

Show more

Dreo Smart Humidifier HM524S 6L vs the average humidifier

Why is Dreo Smart Humidifier HM524S 6L better than the average humidifier?

Show more

Hide

36 hours longer runtime
Dreo Smart Humidifier HM524S 6L runs longer on a single fill than the average humidifier (60 hours vs 24 hours).
What it is: The longest stated operating time from one full water tank.
When it matters: Longer runtime means fewer refills during overnight use or extended daily operation.
Importance: HIGH
Good value: At least 24 hours
Dreo Smart Humidifier HM524S 6L runs longer on a single fill than the average humidifier (60 hours vs 24 hours).60 hours vs 24 hours
Wi-Fi control
Dreo Smart Humidifier HM524S 6L supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
What it is: Indicates whether the humidifier connects to Wi-Fi for remote app-based features.
When it matters: Wi-Fi matters if you want to adjust settings or monitor the humidifier away from its controls.
Importance: HIGH
Good value: yes
Dreo Smart Humidifier HM524S 6L supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
2.65 L larger water tank
Dreo Smart Humidifier HM524S 6L has a larger water tank than the average humidifier (6 L vs 3.35 L).
What it is: The usable amount of water the humidifier’s reservoir can hold.
When it matters: A larger tank generally needs fewer refills and can support longer operation between top-ups.
Importance: HIGH
Good value: At least 4 L
Dreo Smart Humidifier HM524S 6L has a larger water tank than the average humidifier (6 L vs 3.35 L).6 L vs 3.35 L
Voice control supported
Dreo Smart Humidifier HM524S 6L supports voice control; the average humidifier does not support voice control.
What it is: Indicates whether the humidifier can be operated through a compatible voice assistant.
When it matters: Voice control is useful for hands-free adjustment and smart-home routines.
Importance: MEDIUM
Good value: yes
Dreo Smart Humidifier HM524S 6L supports voice control; the average humidifier does not support voice control.
Hygrostat included
Dreo Smart Humidifier HM524S 6L has a hygrostat; the average humidifier has no hygrostat.
What it is: Whether the humidifier can sense room humidity and regulate its output automatically.
When it matters: A hygrostat helps maintain a chosen humidity target without constant manual adjustment or unnecessary operation.
Importance: HIGH
Good value: yes
Dreo Smart Humidifier HM524S 6L has a hygrostat; the average humidifier has no hygrostat.
15.45 m² more room coverage
Dreo Smart Humidifier HM524S 6L covers larger rooms than the average humidifier (46.5 m² vs 31 m²).
What it is: The largest room floor area the humidifier is recommended to cover.
When it matters: A larger coverage rating is important for open-plan spaces and larger bedrooms or living rooms.
Importance: HIGH
Good value: At least 40 m²
Dreo Smart Humidifier HM524S 6L covers larger rooms than the average humidifier (46.5 m² vs 31 m²).46.45 m² vs 31 m²
Dedicated aroma compartment
Dreo Smart Humidifier HM524S 6L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
Includes dedicated aroma hardware such as a tray, pad, drawer, or compartment.
What it is: Indicates whether the humidifier has a separate compartment for aroma pads or essential oils.
When it matters: A dedicated compartment keeps fragrance media separate from the main water tank.
Importance: LOW
Good value: yes
Dreo Smart Humidifier HM524S 6L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
Display included
Dreo Smart Humidifier HM524S 6L has a display; the average humidifier does not have a display.
What it is: Whether the humidifier has a display for settings and status information.
When it matters: A display makes humidity, mode and timer information easier to check.
Importance: LOW
Good value: yes
Dreo Smart Humidifier HM524S 6L has a display; the average humidifier does not have a display.
36 hours longer runtime
Dreo Smart Humidifier HM524S 6L runs longer on a single fill than the average humidifier (60 hours vs 24 hours).
2.65 L larger water tank
Dreo Smart Humidifier HM524S 6L has a larger water tank than the average humidifier (6 L vs 3.35 L).
Hygrostat included
Dreo Smart Humidifier HM524S 6L has a hygrostat; the average humidifier has no hygrostat.
15.45 m² more room coverage
Dreo Smart Humidifier HM524S 6L covers larger rooms than the average humidifier (46.5 m² vs 31 m²).
10 % RH lower target humidity
Dreo Smart Humidifier HM524S 6L supports a lower target humidity setting than the average humidifier (30% RH vs 40% RH).
10 % RH higher target humidity
Dreo Smart Humidifier HM524S 6L supports a higher target humidity setting than the average humidifier (90% RH vs 80% RH).
15.4% higher humidification rate
Dreo Smart Humidifier HM524S 6L delivers a higher humidification rate than the average humidifier (300 ml/h vs 260 ml/h).
1.1 dB lower maximum noise
Dreo Smart Humidifier HM524S 6L is quieter at maximum output than the average humidifier (32 dB vs 33.1 dB).
Wi-Fi control
Dreo Smart Humidifier HM524S 6L supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
Voice control supported
Dreo Smart Humidifier HM524S 6L supports voice control; the average humidifier does not support voice control.
Dedicated aroma compartment
Dreo Smart Humidifier HM524S 6L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
Display included
Dreo Smart Humidifier HM524S 6L has a display; the average humidifier does not have a display.
3.25 cm shallower body
Dreo Smart Humidifier HM524S 6L has a shallower depth than the average humidifier (15 cm vs 18.25 cm).
0.01 m longer power cable
Dreo Smart Humidifier HM524S 6L has a longer power cable than the average humidifier (1.5 m vs 1.51 m).

Why is Dreo Smart Humidifier HM524S 6L worse than the average humidifier?

Show more

Hide

4 W higher power draw
Dreo Smart Humidifier HM524S 6L draws more power than the average humidifier (28 W vs 24 W).
9.45 cm wider body
Dreo Smart Humidifier HM524S 6L has a wider body than the average humidifier (29 cm vs 19.555 cm).
No 360° nozzle
Dreo Smart Humidifier HM524S 6L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
18.9% heavier
Dreo Smart Humidifier HM524S 6L is heavier than the average humidifier (1.8 kg vs 1.48 kg).
2.52 cm taller body
Dreo Smart Humidifier HM524S 6L stands taller than the average humidifier (31.5 cm vs 28.98 cm).
9.45 cm wider body
Dreo Smart Humidifier HM524S 6L has a wider body than the average humidifier (29 cm vs 19.555 cm).
What it is: The humidifier’s side-to-side width.
When it matters: A narrower humidifier takes up less space on a bedside table, desk or shelf.
Importance: MEDIUM
Good value: Up to 20 cm
Dreo Smart Humidifier HM524S 6L has a wider body than the average humidifier (29 cm vs 19.555 cm).29 cm vs 19.555 cm
No 360° nozzle
Dreo Smart Humidifier HM524S 6L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
What it is: Whether the humidifier has a nozzle that rotates through 360° to direct the mist.
When it matters: A rotating nozzle helps redirect mist without moving the humidifier.
Importance: LOW
Good value: yes
Dreo Smart Humidifier HM524S 6L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
4 W higher power draw
Dreo Smart Humidifier HM524S 6L draws more power than the average humidifier (28 W vs 24 W).
What it is: The humidifier’s maximum rated electrical power draw.
When it matters: Lower power draw can reduce electricity use, especially when the humidifier runs for many hours each day.
Importance: MEDIUM
Good value: Up to 25 W
Dreo Smart Humidifier HM524S 6L draws more power than the average humidifier (28 W vs 24 W).28 W vs 24 W
18.9% heavier
Dreo Smart Humidifier HM524S 6L is heavier than the average humidifier (1.8 kg vs 1.48 kg).
What it is: The humidifier’s weight without packaging.
When it matters: A lighter humidifier is easier to move for refilling, cleaning or storage.
Importance: MEDIUM
Good value: Up to 1.5 kg
Dreo Smart Humidifier HM524S 6L is heavier than the average humidifier (1.8 kg vs 1.48 kg).1.76 kg vs 1.48 kg
2.52 cm taller body
Dreo Smart Humidifier HM524S 6L stands taller than the average humidifier (31.5 cm vs 28.98 cm).
What it is: The humidifier’s total height from its base to its highest point.
When it matters: A shorter humidifier fits more easily beneath shelves and in low spaces.
Importance: LOW
Good value: Up to 25 cm
Dreo Smart Humidifier HM524S 6L stands taller than the average humidifier (31.5 cm vs 28.98 cm).31.5 cm vs 28.98 cm
57.1% more expensive
Dreo Smart Humidifier HM524S 6L is more expensive than the average humidifier (£55 vs £35).
Dreo Smart Humidifier HM524S 6L is more expensive than the average humidifier (£55 vs £35).£55 vs £35

Graphic comparison of Dreo Smart Humidifier HM524S 6L and other products in the Humidifiers category

Attribute category

Attribute

No results found

Third-party reviews

United Kingdom

United States

(Reviews last updated: August 2026)

What customers like about Dreo Smart Humidifier HM524S 6L?

Large 6-liter water tank provides a long runtime of up to 60 hours without frequent refills.
Whisper-quiet operation at around 28 dB makes it excellent for bedrooms and nurseries.
Powerful mist output can comfortably cover large rooms up to 500 square feet.
Convenient top-fill design allows for hassle-free water refills.
Seamless smart integration with a user-friendly mobile app, Alexa, and Google Assistant.
Modular design makes disassembly and cleaning simple.
Includes a dedicated aromatherapy tray for adding essential oils safely.
Accurate auto-mode self-balances mist output based on real-time room humidity data.

What customers dislike about Dreo Smart Humidifier HM524S 6L?

Lacks a warm mist functionality, restricted entirely to cool mist output.
Nozzle flexibility is limited compared to other models, lacking a full 45-degree or 90-degree tilt angle control.
The water tank design does not include a traditional top or flip-up carry handle.
Requires regular weekly maintenance and optional descaling cartridges to manage mineral buildup or hard water.

Expert reviews

consumerreports.org

N/A

Summary of the review

Dreo HM524S Humidifier Review - Consumer Reports

The Consumer Reports review highlights the Dreo HM524S as a top-performing, midsized ultrasonic cool-mist model, excelling in moisture output, energy efficiency, quiet operation, and accurate humidistat performance for rooms between 300 to 599 square feet. Key benefits include convenient features like a top-fill design, an aroma diffuser, and an app-compatible 12-hour timer, while drawbacks are limited to the lack of a warm-mist option, reliance on an app for programming, and a requirement for strict weekly cleaning.

bobvila.com

28/08/2025

Summary of the review

Dreo Smart Humidifier Review - Tested by Bob Vila

The Dreo HM306S Smart Humidifier is a budget-friendly, 3-litre ultrasonic unit ideal for rooms up to 300 square feet, noted for its fine, dry mist, quiet operation, top-fill design, and app-controlled features. While offering a 30-hour runtime and an essential-oil tray, the unit's drawbacks include a lack of Wi-Fi memory, requiring re-syncing when moved, and a smaller capacity that may necessitate frequent refills.

cnet.com

23/02/2026

Summary of the review

Best Humidifiers to Keep Your Home Comfortable and Healthy

In a CNET review, 12 top-selling humidifiers were evaluated, identifying the Levoit OasisMist 450S as best overall due to strong performance, app control, and a built-in humidistat. Top-rated models, including the Dreo HM713S, offer excellent moisture output, while the Blueair InvisibleMist H35i provides energy-efficient evaporative technology. However, the review notes that budget models often lack sufficient airflow, warm-mist settings increase energy costs, and bottom-fill tanks like the Vornado UH100 can be messy.

Video reviews

Best alternatives

LEVOIT Classic 300S

Humidifiers

LEVOIT Dual 200S

Humidifiers

Dreo Smart Humidifier HM311S 4L

Humidifiers

Humidifiers

YOKEKON YK721553973480

Humidifiers

GoveeLife Smart 4.5L

Humidifiers

Dreo Smart Humidifier HM306S 3L

Humidifiers

Vicks SweetDreams Cool Mist VUL575

Humidifiers

Elechomes EC5501

Humidifiers

Xiaomi Mi Smart Humidifier 2

Humidifiers

VOCOlinc MistFlow VH1

Humidifiers

LEVOIT Dual 150

Humidifiers

Compare Dreo Smart Humidifier HM524S 6L with other products in the Humidifiers category

Compare