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Dreo Humidifier HM524 6L Review | 43 Data compared

Avg. price in UK: ~£90
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 Humidifier HM524 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.

8.1

Excellent

7.9

Very good

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

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Verdict

The Dreo HM524 is a 6-liter ultrasonic cool mist humidifier designed to cover rooms up to 500 square feet with a maximum moisture output of 300 ml/hour. Its primary characteristics and pros include a massive runtime of up to 60 hours on low/sleep mode, a top-fill design for easy refills, an integrated auto-mode humidistat with 5% accuracy tracking, an ultra-quiet noise level of 28 dB, a customizable ambient LED humidity indicator, a 12-hour timer, and a dedicated essential oil tray for aromatherapy. However, main cons are that the standard HM524 base model lacks Wi-Fi smart app integration, it only provides cool mist rather than a warm mist option, and its bulkier footprint makes it less suited for compact desktop placement.

Technical Specifications of humidifier Dreo Humidifier HM524 6L

Overall score

8.1

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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

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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

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Features

7.4

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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

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Design

6.2

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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

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Dreo Humidifier HM524 6L vs the average humidifier

Why is Dreo Humidifier HM524 6L better than the average humidifier?

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36 hours longer runtime
Dreo Humidifier HM524 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 Humidifier HM524 6L runs longer on a single fill than the average humidifier (60 hours vs 24 hours).60 hours vs 24 hours
2.65 L larger water tank
Dreo Humidifier HM524 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 Humidifier HM524 6L has a larger water tank than the average humidifier (6 L vs 3.35 L).6 L vs 3.35 L
Hygrostat included
Dreo Humidifier HM524 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 Humidifier HM524 6L has a hygrostat; the average humidifier has no hygrostat.
15.45 m² more room coverage
Dreo Humidifier HM524 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 Humidifier HM524 6L covers larger rooms than the average humidifier (46.5 m² vs 31 m²).46.45 m² vs 31 m²
Dedicated aroma compartment
Dreo Humidifier HM524 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 Humidifier HM524 6L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
Display included
Dreo Humidifier HM524 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 Humidifier HM524 6L has a display; the average humidifier does not have a display.
3.25 cm shallower body
Dreo Humidifier HM524 6L has a shallower depth than the average humidifier (15 cm vs 18.25 cm).
What it is: The humidifier’s front-to-back depth.
When it matters: A shallower humidifier needs less usable surface depth on a table or shelf.
Importance: MEDIUM
Good value: Up to 20 cm
Dreo Humidifier HM524 6L has a shallower depth than the average humidifier (15 cm vs 18.25 cm).15 cm vs 18.25 cm
10 % RH lower target humidity
Dreo Humidifier HM524 6L supports a lower target humidity setting than the average humidifier (30% RH vs 40% RH).
What it is: The lowest relative-humidity target the user can select.
When it matters: A lower minimum target provides more flexibility in damp climates or rooms where a modest humidity level is preferred.
Importance: LOW
Good value: Up to 30% RH
Dreo Humidifier HM524 6L supports a lower target humidity setting than the average humidifier (30% RH vs 40% RH).30 % RH vs 40 % RH
36 hours longer runtime
Dreo Humidifier HM524 6L runs longer on a single fill than the average humidifier (60 hours vs 24 hours).
2.65 L larger water tank
Dreo Humidifier HM524 6L has a larger water tank than the average humidifier (6 L vs 3.35 L).
Hygrostat included
Dreo Humidifier HM524 6L has a hygrostat; the average humidifier has no hygrostat.
15.45 m² more room coverage
Dreo Humidifier HM524 6L covers larger rooms than the average humidifier (46.5 m² vs 31 m²).
10 % RH lower target humidity
Dreo Humidifier HM524 6L supports a lower target humidity setting than the average humidifier (30% RH vs 40% RH).
10 % RH higher target humidity
Dreo Humidifier HM524 6L supports a higher target humidity setting than the average humidifier (90% RH vs 80% RH).
15.4% higher humidification rate
Dreo Humidifier HM524 6L delivers a higher humidification rate than the average humidifier (300 ml/h vs 260 ml/h).
1.1 dB lower maximum noise
Dreo Humidifier HM524 6L is quieter at maximum output than the average humidifier (32 dB vs 33.1 dB).
Dedicated aroma compartment
Dreo Humidifier HM524 6L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
Display included
Dreo Humidifier HM524 6L has a display; the average humidifier does not have a display.
3.25 cm shallower body
Dreo Humidifier HM524 6L has a shallower depth than the average humidifier (15 cm vs 18.25 cm).

Why is Dreo Humidifier HM524 6L worse than the average humidifier?

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4 W higher power draw
Dreo Humidifier HM524 6L draws more power than the average humidifier (28 W vs 24 W).
9.45 cm wider body
Dreo Humidifier HM524 6L has a wider body than the average humidifier (29 cm vs 19.555 cm).
No 360° nozzle
Dreo Humidifier HM524 6L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
18.9% heavier
Dreo Humidifier HM524 6L is heavier than the average humidifier (1.8 kg vs 1.48 kg).
0.01 m shorter power cable
Dreo Humidifier HM524 6L has a shorter power cable than the average humidifier (1.5 m vs 1.51 m).
2.52 cm taller body
Dreo Humidifier HM524 6L stands taller than the average humidifier (31.5 cm vs 28.98 cm).
9.45 cm wider body
Dreo Humidifier HM524 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 Humidifier HM524 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 Humidifier HM524 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 Humidifier HM524 6L does not have a 360° nozzle; the average humidifier has a 360° nozzle.
4 W higher power draw
Dreo Humidifier HM524 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 Humidifier HM524 6L draws more power than the average humidifier (28 W vs 24 W).28 W vs 24 W
18.9% heavier
Dreo Humidifier HM524 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 Humidifier HM524 6L is heavier than the average humidifier (1.8 kg vs 1.48 kg).1.76 kg vs 1.48 kg
0.01 m shorter power cable
Dreo Humidifier HM524 6L has a shorter power cable than the average humidifier (1.5 m vs 1.51 m).
What it is: The usable length of the humidifier’s power cable.
When it matters: A longer cable offers more freedom to place the humidifier away from a wall socket.
Importance: LOW
Good value: At least 1.5 m
Dreo Humidifier HM524 6L has a shorter power cable than the average humidifier (1.5 m vs 1.51 m).1.5 m vs 1.51 m
2.52 cm taller body
Dreo Humidifier HM524 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 Humidifier HM524 6L stands taller than the average humidifier (31.5 cm vs 28.98 cm).31.5 cm vs 28.98 cm
2.57x more expensive
Dreo Humidifier HM524 6L is more expensive than the average humidifier (£90 vs £35).
Dreo Humidifier HM524 6L is more expensive than the average humidifier (£90 vs £35).£90 vs £35

Graphic comparison of Dreo Humidifier HM524 6L and other products in the Humidifiers category

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Third-party reviews

United Kingdom

United States

(Reviews last updated: August 2026)

What customers like about Dreo Humidifier HM524 6L?

Large 6-liter water tank capacity providing up to 60 hours of continuous runtime
Top-fill design makes refilling quick, easy, and mess-free
Extremely quiet operation at 28 dB, making it perfect for bedrooms and nurseries
Powerful mist output that can reach up to 40 inches high to prevent floor pooling
Excellent smart features including a responsive mobile app and voice assistant integration
Accurate built-in humidistat sensor that displays real-time room humidity levels
Dedicated aromatherapy tray for essential oils that keeps them separate from the water tank
Modular design that is easy to disassemble and clean

What customers dislike about Dreo Humidifier HM524 6L?

Lacks a warm mist option, limiting its use strictly to cool mist humidification
Nozzle has limited directional adjustment and cannot be tilted to acute angles like 45 degrees
Descaling cartridge for hard water is sold separately and not included in the box
Smart features and remote app setup require a stable 2.4 GHz Wi-Fi network to function

Expert reviews

consumerreports.org

N/A

Summary of the review

Dreo HM524S Humidifier Review - Consumer Reports

According to Consumer Reports testing, the Dreo HM524S is a top-rated, ultrasonic cool-mist humidifier designed for medium-sized spaces, boasting excellent performance, low operating costs, and no required filter replacements. The unit features an integrated humidistat, nightlight, and automatic shut-off, though it lacks warm mist capabilities, is not programmable, and requires weekly maintenance.

bobvila.com

28/08/2025

Summary of the review

Dreo Smart Humidifier Review - Tested by Bob Vila

The Bob Vila review characterizes the Dreo HM306S 3L Smart Humidifier as an efficient, budget-friendly option for rooms up to 300 square feet, highlighting its top-fill design, quiet operation, long-lasting mist, and robust app integration for remote monitoring. While lauded for its performance, the unit's main drawback is its lack of Wi-Fi memory, which requires users to re-sync the app whenever the device is unplugged and moved.

homeandsmart.de

06/12/2024

Summary of the review

Dreo Humidifier Review: Top HM524 Ultrasonic Model Put to the Test

The home&smart review awards the Dreo Humidifier HM311S a "very good" rating, highlighting its effective humidification for rooms up to 30 square meters, a 4-litre top-fill tank, and reliable smart app controls. Pros include an aroma diffuser, LED indicator, and convenient scheduling, while cons involve the need for frequent cleaning every three days to ensure hygiene and a measured noise level (35 dB) slightly higher than advertised.

consumerreports.org

Not Dated

Summary of the review

Consumer Reports: Dreo HM524S Humidifier Review

The Consumer Reports review identifies the Dreo HM524S as a top-rated, highly efficient ultrasonic humidifier suitable for medium-sized rooms (300-599 sq. ft.). It is praised for excellent moisture output, quiet operation, and accurate, app-controlled humidistat readings, though it is limited by a lack of on-device controls, cool-mist only operation, and a requirement for strict weekly maintenance to manage potential bacterial buildup.

bobvila.com

28/08/2025

Summary of the review

Bob Vila: Dreo Smart Humidifier Review - Tested by Bob Vila

The Dreo HM306S Smart Humidifier is a highly recommended option for spaces up to 300 square feet, offering a top-fill design, quiet operation, and an aroma tray, according to a Bob Vila review. Key benefits include its ability to produce a fine mist without surrounding moisture and convenient smart app control. However, the unit has a limited 3-liter capacity requiring frequent refills and lacks Wi-Fi memory, meaning it must be re-synced if unplugged.

achetezlemeilleur.ca

05/02/2026

Summary of the review

I tested 18 humidifiers sold in Quebec: here are the top 3

Based on tests of 18 models for Quebec homes, this AchetezLeMeilleur review highlights that, while effective at improving air quality, these devices are specialized tools with specific limitations. Key advantages include honest, accurate performance, near-silent operation, smart home compatibility, and easy-to-clean bases. However, significant drawbacks consist of a mandatory requirement for demineralized water to avoid buildup, a limited coverage area of roughly 219 sq ft (20 m²), and ergonomic design flaws that make water transport difficult and leave the base wet.

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