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Dreo Smart Humidifier HM717S 8L Review | 43 Data compared

Avg. price in UK: ~£110
Avg. price in US: ~$150
Humidification rate: 550 ml/h
Maximum room area: 55.74 m²
Water tank capacity: 8 L
Maximum operating time: 80 hours
Maximum noise level: 35 dB

Dreo Smart Humidifier HM717S 8L 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

8.6

Excellent

8.2

Excellent

8.6
Bedroom use
Score components:
35.0%
6.0
Maximum noise level
25.0%
10
Maximum operating time
20.0%
10
Timer
20.0%
10
Automatic low-water shut-off
10
Large rooms
Score components:
35.0%
10
Humidification rate
30.0%
10
Maximum room area
25.0%
10
Water tank capacity
10.0%
10
Hygrostat
10
Plant care
Score components:
30.0%
10
Hygrostat
25.0%
10
Humidification rate
25.0%
10
Water tank capacity
20.0%
10
360° nozzle

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Verdict

The Dreo Smart Humidifier HM717S is a warm and cool hybrid ultrasonic humidifier featuring a massive 8-liter water tank, a powerful 550 mL/h maximum mist output, and coverage optimized for large spaces up to 600 square feet. Key characteristics and advantages include an impressive continuous runtime of up to 80 hours, an ultra-quiet sleep mode operating at just 28 dB, a 40-inch tall mist projection, an integrated aroma diffuser tray, precision humidistat controls (30% to 90% RH), and smart integration via the Dreo app, Amazon Alexa, or Google Home. On the downside, the unit can experience a slight delay in initial heating for warm mist, adds 15 to 20 dB of operational noise on its highest level, and lacks built-in Wi-Fi memory, meaning it requires a brief re-sync to the application whenever it is unplugged and moved to a new room.

Technical Specifications of humidifier Dreo Smart Humidifier HM717S 8L

Overall score

8.5

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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

9.1

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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

9.1

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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

5.7

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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

silver

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 Smart Humidifier HM717S 8L vs the average humidifier

Why is Dreo Smart Humidifier HM717S 8L better than the average humidifier?

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2.12x higher humidification rate
Dreo Smart Humidifier HM717S 8L delivers a higher humidification rate than the average humidifier (550 ml/h vs 260 ml/h).
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
Dreo Smart Humidifier HM717S 8L delivers a higher humidification rate than the average humidifier (550 ml/h vs 260 ml/h).550 ml/h vs 260 ml/h
56 hours longer runtime
Dreo Smart Humidifier HM717S 8L runs longer on a single fill than the average humidifier (80 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 HM717S 8L runs longer on a single fill than the average humidifier (80 hours vs 24 hours).80 hours vs 24 hours
4.65 L larger water tank
Dreo Smart Humidifier HM717S 8L has a larger water tank than the average humidifier (8 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 HM717S 8L has a larger water tank than the average humidifier (8 L vs 3.35 L).8 L vs 3.35 L
24.74 m² more room coverage
Dreo Smart Humidifier HM717S 8L covers larger rooms than the average humidifier (55.7 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 HM717S 8L covers larger rooms than the average humidifier (55.7 m² vs 31 m²).55.74 m² vs 31 m²
Warm-mist option
Dreo Smart Humidifier HM717S 8L offers a warm-mist option; the average humidifier does not offer a warm-mist option.
Supports both warm and cool mist.
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
Dreo Smart Humidifier HM717S 8L offers a warm-mist option; the average humidifier does not offer a warm-mist option.
Wi-Fi control
Dreo Smart Humidifier HM717S 8L 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 HM717S 8L supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
Voice control supported
Dreo Smart Humidifier HM717S 8L 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 HM717S 8L supports voice control; the average humidifier does not support voice control.
Hygrostat included
Dreo Smart Humidifier HM717S 8L 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 HM717S 8L has a hygrostat; the average humidifier has no hygrostat.
2.12x higher humidification rate
Dreo Smart Humidifier HM717S 8L delivers a higher humidification rate than the average humidifier (550 ml/h vs 260 ml/h).
56 hours longer runtime
Dreo Smart Humidifier HM717S 8L runs longer on a single fill than the average humidifier (80 hours vs 24 hours).
4.65 L larger water tank
Dreo Smart Humidifier HM717S 8L has a larger water tank than the average humidifier (8 L vs 3.35 L).
24.74 m² more room coverage
Dreo Smart Humidifier HM717S 8L covers larger rooms than the average humidifier (55.7 m² vs 31 m²).
Hygrostat included
Dreo Smart Humidifier HM717S 8L has a hygrostat; the average humidifier has no hygrostat.
10 % RH lower target humidity
Dreo Smart Humidifier HM717S 8L supports a lower target humidity setting than the average humidifier (30% RH vs 40% RH).
10 % RH higher target humidity
Dreo Smart Humidifier HM717S 8L supports a higher target humidity setting than the average humidifier (90% RH vs 80% RH).
Warm-mist option
Dreo Smart Humidifier HM717S 8L offers a warm-mist option; the average humidifier does not offer a warm-mist option.
Wi-Fi control
Dreo Smart Humidifier HM717S 8L supports Wi-Fi control; the average humidifier does not support Wi-Fi control.
Voice control supported
Dreo Smart Humidifier HM717S 8L supports voice control; the average humidifier does not support voice control.
Dedicated aroma compartment
Dreo Smart Humidifier HM717S 8L includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
Display included
Dreo Smart Humidifier HM717S 8L has a display; the average humidifier does not have a display.
0.17 m longer power cable
Dreo Smart Humidifier HM717S 8L has a longer power cable than the average humidifier (1.7 m vs 1.51 m).
1.15 cm shallower body
Dreo Smart Humidifier HM717S 8L has a shallower depth than the average humidifier (17.1 cm vs 18.25 cm).

Why is Dreo Smart Humidifier HM717S 8L worse than the average humidifier?

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276 W higher power draw
Dreo Smart Humidifier HM717S 8L draws more power than the average humidifier (300 W vs 24 W).
1.9 dB higher maximum noise
Dreo Smart Humidifier HM717S 8L is louder at maximum output than the average humidifier (35 dB vs 33.1 dB).
2.12x heavier
Dreo Smart Humidifier HM717S 8L is heavier than the average humidifier (3.1 kg vs 1.48 kg).
10.95 cm wider body
Dreo Smart Humidifier HM717S 8L has a wider body than the average humidifier (30.5 cm vs 19.555 cm).
7.72 cm taller body
Dreo Smart Humidifier HM717S 8L stands taller than the average humidifier (36.7 cm vs 28.98 cm).
276 W higher power draw
Dreo Smart Humidifier HM717S 8L draws more power than the average humidifier (300 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 HM717S 8L draws more power than the average humidifier (300 W vs 24 W).300 W vs 24 W
2.12x heavier
Dreo Smart Humidifier HM717S 8L is heavier than the average humidifier (3.1 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 HM717S 8L is heavier than the average humidifier (3.1 kg vs 1.48 kg).3.14 kg vs 1.48 kg
10.95 cm wider body
Dreo Smart Humidifier HM717S 8L has a wider body than the average humidifier (30.5 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 HM717S 8L has a wider body than the average humidifier (30.5 cm vs 19.555 cm).30.5 cm vs 19.555 cm
7.72 cm taller body
Dreo Smart Humidifier HM717S 8L stands taller than the average humidifier (36.7 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 HM717S 8L stands taller than the average humidifier (36.7 cm vs 28.98 cm).36.7 cm vs 28.98 cm
1.9 dB higher maximum noise
Dreo Smart Humidifier HM717S 8L is louder at maximum output than the average humidifier (35 dB vs 33.1 dB).
What it is: The highest stated operating sound level across normal humidification modes.
When it matters: A lower maximum noise level is better for bedrooms, nurseries, calls, and light sleepers.
Importance: HIGH
Good value: Up to 35 dB
Dreo Smart Humidifier HM717S 8L is louder at maximum output than the average humidifier (35 dB vs 33.1 dB).35 dB vs 33.1 dB
3.14x more expensive
Dreo Smart Humidifier HM717S 8L is more expensive than the average humidifier (£110 vs £35).
Dreo Smart Humidifier HM717S 8L is more expensive than the average humidifier (£110 vs £35).£110 vs £35

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Third-party reviews

United Kingdom

United States

(Reviews last updated: August 2026)

What customers like about Dreo Smart Humidifier HM717S 8L?

Massive 8-liter water tank capacity that significantly reduces the frequency of refills.
Dual mist functionality offering both cool and quick-heating warm mist options.
High mist output up to 550 ml/h provides excellent coverage for large rooms up to 600 square feet.
Very quiet operation at just 28dB on low settings, making it ideal for bedrooms and nurseries.
Convenient top-fill design makes refilling and cleaning straightforward.
Robust smart features include Dreo app tracking, scheduling, and Alexa/Google Home voice control.
Dedicated aroma pad tray that diffuses essential oils effectively without clogging the main water tank.
Aesthetic built-in RGB ambient night light that can be dimmed or customized.

What customers dislike about Dreo Smart Humidifier HM717S 8L?

Consumes water at a rapid rate when operating continuously on the highest mist or warm mist settings.
Lacks Wi-Fi memory, requiring users to re-sync the device to the app when moved to a different room.
Requires regular descaling and deep cleaning to prevent mineral build-up and slime in the base.
Can leave behind fine white dust if used with hard tap water without a demineralization cartridge.
The overall footprint is relatively large and bulky compared to standard bedroom humidifiers.
Warm mist setting noticeably increases electricity consumption.

Expert reviews

consumerreports.org

Not publicly dated

Summary of the review

Dreo HM717S Humidifier Review - Consumer Reports

The Consumer Reports review of the Dreo HM717S humidifier highlights its capacity to serve spaces up to 600 square feet with a 2.4-gallon daily output and versatile warm/cool mist functionality. Pros include smart features, a built-in humidistat, and a filter-free design that avoids ongoing costs. However, the unit requires mandatory weekly cleaning to prevent mold, lacks antimicrobial properties, and has a 66-inch power cord.

thespruce.com

06/01/2026

Summary of the review

The 11 Best Humidifiers The Spruce Has Tested

In their lab-tested round-up, The Spruce identifies the Levoit Classic Smart Humidifier as the best overall, alongside top picks like the BlueAir InvisibleMist and Vornado for specific needs. The reviewed units are lauded for pros such as intuitive app controls, large capacity, and quiet operation, while cons include high pricing (up to $925) for certain models, lack of warm-mist settings, and difficult-to-clean narrow tanks.

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