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Medisana AH 661 Review | 43 Data compared

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  • Avg. price: ~£45
  • Humidification rate: 350 ml/h
  • Maximum room area: 30 m²
  • Water tank capacity: 3.5 L
  • Maximum operating time: 14 hours
  • Maximum noise level: 15 dB

Medisana AH 661 review. Compare 43 technical specifications and user reviews to see how this product ranks in the Humidifiers category and whether it is worth buying.

7.0

Overall score

What it is: An overall evaluation of products in the Humidifiers category, based on technical analysis and user reviews.

When it matters: When you need a quick reference for identifying the best products in the Humidifiers category.

Score components:

80.0%

7.1

Technical Score

20.0%

6.5

User score

Very good
7.1

Technical Score

What it is: An assessment of technical performance for products in the Humidifiers category across these key areas: Performance, Features, Design.

When it matters: When you want to compare products in the Humidifiers category by technical performance, specifications, and available features.

Score components:

45.0%

6.5

Performance

40.0%

7.8

Features

15.0%

6.9

Design

Very good
6.5

User score

What it is: A rating that combines user reviews with the total review volume for products in the Humidifiers category.

When it matters: When you want to know how products in the Humidifiers category perform in everyday use and how reliable owners find them over time.

Score components:

70.0%

7.8

User reviews

30.0%

3.3

Popularity

User score:
United Kingdom
amazon
3.9
(161)

(Reviews last updated: August 2026)

Good
  • 8.1
    Bedroom use

    Score components:

    35.0%

    10

    Maximum noise level

    25.0%

    2.5

    Maximum operating time

    20.0%

    10

    Timer

    20.0%

    10

    Automatic low-water shut-off

  • 6.4
    Large rooms

    Score components:

    35.0%

    8.7

    Humidification rate

    30.0%

    4.8

    Maximum room area

    25.0%

    6.1

    Water tank capacity

    10.0%

    4.0

    Hygrostat

  • 5.7
    Plant care

    Score components:

    30.0%

    4.0

    Hygrostat

    25.0%

    8.7

    Humidification rate

    25.0%

    6.1

    Water tank capacity

    20.0%

    4.0

    360° nozzle

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Best prices in UK

Best rankings

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Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The Medisana AH 661 is an ultrasonic humidifier equipped with a 3.5-liter water tank, a 75-watt power consumption profile, and dimensions of 18.5 x 18.5 x 28.2 cm. Utilizing micro-fine atomization tech, its main characteristics include a 2/4/6-hour timer, touch controls, and an integrated aromatherapy compartment for scented oils. Key pros are its unique pre-heating feature that sanitizes water to reduce germs, a maximum misting output of up to 350 ml/h for hot mist (250 ml/h for cold), an automatic shut-off safety sensor, whisper-quiet bedroom-safe operation, and an autonomy of 10 to 14 hours. Main cons include a lack of precise automated climate-target controls and a bottom-fill design requiring tank removal, which makes routine cleanings and refilling less convenient than newer top-fill models.

Technical Specifications of humidifier Medisana AH 661

Technical Score

What it is: An assessment of technical performance for products in the Humidifiers category across these key areas: Performance, Features, Design.

When it matters: When you want to compare products in the Humidifiers category by technical performance, specifications, and available features.

Score components:

45.0%

6.5

Performance

40.0%

7.8

Features

15.0%

6.9

Design

7.1
Medisana AH 661 has a technical score of 7.07 points, which is higher than 63.8% of products in this category.
User score

What it is: A rating that combines user reviews with the total review volume for products in the Humidifiers category.

When it matters: When you want to know how products in the Humidifiers category perform in everyday use and how reliable owners find them over time.

Score components:

70.0%

7.8

User reviews

30.0%

3.3

Popularity

User score:
United Kingdom
amazon
3.9
(161)

(Reviews last updated: August 2026)

6.5
Medisana AH 661 has a user score of 6.46 points, which is lower than 88.6% of products in this category.
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.
3.3
Medisana AH 661 has a popularity of 3.3 points, which is lower than 71.8% of products in this category.
Ratio quality/price

What it is: An indicator that combines the overall score of products in the Humidifiers category with their prices.

When it matters: When you are comparing products in the Humidifiers category and want a good balance between quality and price.

Score components:

60.0%

7.0

Overall score

40.0%

9.4

Price

7.7
Medisana AH 661 has a quality-to-price ratio of 7.7 points, which is higher than 57.7% of products in this category.
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

350 ml/h
Medisana AH 661 delivers a humidification rate of 350 ml/h, which is higher than that of 75.7% of humidifiers and equal to that of 5.7% of humidifiers.
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

30 m²
Medisana AH 661 covers rooms up to 30 m², which is smaller than that of 50.7% of humidifiers and equal to that of 16.2% of humidifiers.
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

3.5 L
Medisana AH 661 has a water tank capacity of 3.5 L, which is larger than that of 50.3% of humidifiers and equal to that of 4% of humidifiers.
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

14 hours
Medisana AH 661 runs for up to 14 hours on a single fill, which is shorter than 71.8% of humidifiers.
Show more
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

yes
Medisana AH 661 offers a warm-mist option. A warm-mist option is present in 25.5% of humidifiers.
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

yes
Medisana AH 661 supports aromatherapy. Aromatherapy support is available in 73.8% of humidifiers.
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

yes
Medisana AH 661 includes a dedicated aroma compartment. A dedicated aroma compartment is present in 48.3% of humidifiers.
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

yes
Medisana AH 661 shuts off automatically when water runs low. Automatic low-water shut-off is available in 99.3% of humidifiers.
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

yes
Medisana AH 661 includes a water-level indicator. A water-level indicator is present in 83.9% of humidifiers.
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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

bottom 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

no
Medisana AH 661 does not have a 360° nozzle. A 360° nozzle is included in 58.4% of humidifiers.
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

no
Medisana AH 661 does not have a display. A display is included in 44.3% of humidifiers.
Show more

Medisana AH 661 vs the average humidifier

  • Warm-mist option
    Medisana AH 661 offers a warm-mist option; the average humidifier does not offer a warm-mist option.
    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

    Medisana AH 661 offers a warm-mist option; the average humidifier does not offer a warm-mist option.
  • 18.1 dB lower maximum noise
    Medisana AH 661 is quieter at maximum output than the average humidifier (15 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

    Medisana AH 661 is quieter at maximum output than the average humidifier (15 dB vs 33.1 dB).15 dB vs 33.1 dB
  • 34.6% higher humidification rate
    Medisana AH 661 delivers a higher humidification rate than the average humidifier (350 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

    Medisana AH 661 delivers a higher humidification rate than the average humidifier (350 ml/h vs 260 ml/h).350 ml/h vs 260 ml/h
  • Dedicated aroma compartment
    Medisana AH 661 includes a dedicated aroma compartment; the average humidifier does not include a 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

    Medisana AH 661 includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
  • 25.7% lighter
    Medisana AH 661 is lighter than the average humidifier (1.1 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

    Medisana AH 661 is lighter than the average humidifier (1.1 kg vs 1.48 kg).1.1 kg vs 1.48 kg
  • 1.06 cm narrower body
    Medisana AH 661 has a narrower body than the average humidifier (18.5 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

    Medisana AH 661 has a narrower body than the average humidifier (18.5 cm vs 19.555 cm).18.5 cm vs 19.555 cm
  • 0.15 L larger water tank
    Medisana AH 661 has a larger water tank than the average humidifier (3.5 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

    Medisana AH 661 has a larger water tank than the average humidifier (3.5 L vs 3.35 L).3.5 L vs 3.35 L
  • 2.5% better value for money
    Medisana AH 661 offers better value for money than the average humidifier (7.67 vs 7.487).
    What it is: An indicator that combines the overall score of products in the Humidifiers category with their prices.
    When it matters: When you are comparing products in the Humidifiers category and want a good balance between quality and price.
    Medisana AH 661 offers better value for money than the average humidifier (7.67 vs 7.487).7.67 vs 7.49
  • 18.1 dB lower maximum noise
    Medisana AH 661 is quieter at maximum output than the average humidifier (15 dB vs 33.1 dB).
  • 34.6% higher humidification rate
    Medisana AH 661 delivers a higher humidification rate than the average humidifier (350 ml/h vs 260 ml/h).
  • 0.15 L larger water tank
    Medisana AH 661 has a larger water tank than the average humidifier (3.5 L vs 3.35 L).
  • Warm-mist option
    Medisana AH 661 offers a warm-mist option; the average humidifier does not offer a warm-mist option.
  • Dedicated aroma compartment
    Medisana AH 661 includes a dedicated aroma compartment; the average humidifier does not include a dedicated aroma compartment.
  • 25.7% lighter
    Medisana AH 661 is lighter than the average humidifier (1.1 kg vs 1.48 kg).
  • 1.06 cm narrower body
    Medisana AH 661 has a narrower body than the average humidifier (18.5 cm vs 19.555 cm).
  • 0.88 cm shorter body
    Medisana AH 661 has a lower profile than the average humidifier (28.1 cm vs 28.98 cm).

Total
Overall
Performance
Features
Design
  • 51 W higher power draw
    Medisana AH 661 draws more power than the average humidifier (75 W vs 24 W).
  • 10 hours shorter runtime
    Medisana AH 661 runs for a shorter time than the average humidifier (14 hours vs 24 hours).
  • 1 m² less room coverage
    Medisana AH 661 covers smaller rooms than the average humidifier (30 m² vs 31 m²).
  • 6 hours shorter timer
    Medisana AH 661 provides a shorter timer setting than the average humidifier (6 hours vs 12 hours).
  • No LED lighting
    Medisana AH 661 does not feature LED lighting; the average humidifier features LED lighting.
  • No 360° nozzle
    Medisana AH 661 does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • 0.01 m shorter power cable
    Medisana AH 661 has a shorter power cable than the average humidifier (1.5 m vs 1.51 m).
  • 0.25 cm deeper body
    Medisana AH 661 has a deeper profile than the average humidifier (18.5 cm vs 18.25 cm).
  • 6 hours shorter timer
    Medisana AH 661 provides a shorter timer setting than the average humidifier (6 hours vs 12 hours).
    What it is: The longest period, in hours, that the humidifier timer can be set for.
    When it matters: A longer maximum timer gives you more flexibility for overnight use and unattended operation.

    Importance: MEDIUM

    Good value: At least 12 hours

    Medisana AH 661 provides a shorter timer setting than the average humidifier (6 hours vs 12 hours).6 hours vs 12 hours
  • 51 W higher power draw
    Medisana AH 661 draws more power than the average humidifier (75 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

    Medisana AH 661 draws more power than the average humidifier (75 W vs 24 W).75 W vs 24 W
  • No LED lighting
    Medisana AH 661 does not feature LED lighting; the average humidifier features LED lighting.
    What it is: Whether the humidifier includes integrated ambient or night lighting, excluding status-only indicator lights.
    When it matters: Ambient or night lighting can provide a gentle glow without requiring a separate night-light.

    Importance: LOW

    Good value: yes

    Medisana AH 661 does not feature LED lighting; the average humidifier features LED lighting.
  • No 360° nozzle
    Medisana AH 661 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

    Medisana AH 661 does not have a 360° nozzle; the average humidifier has a 360° nozzle.
  • 10 hours shorter runtime
    Medisana AH 661 runs for a shorter time than the average humidifier (14 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

    Medisana AH 661 runs for a shorter time than the average humidifier (14 hours vs 24 hours).14 hours vs 24 hours
  • 1 m² less room coverage
    Medisana AH 661 covers smaller rooms than the average humidifier (30 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

    Medisana AH 661 covers smaller rooms than the average humidifier (30 m² vs 31 m²).30 m² vs 31 m²
  • 0.01 m shorter power cable
    Medisana AH 661 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

    Medisana AH 661 has a shorter power cable than the average humidifier (1.5 m vs 1.51 m).1.5 m vs 1.51 m
  • 23.8% lower user score
    Medisana AH 661 has a lower user score than the average humidifier (6.46 vs 8).
    What it is: A rating that combines user reviews with the total review volume for products in the Humidifiers category.
    When it matters: When you want to know how products in the Humidifiers category perform in everyday use and how reliable owners find them over time.
    Medisana AH 661 has a lower user score than the average humidifier (6.46 vs 8).6.46 vs 8
Total
Overall
Performance
Features
Design

Graphic comparison of Medisana AH 661 and other products in the Humidifiers category

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Third-party reviews

United Kingdom
amazon
3.9
161 Reviews

(Reviews last updated: August 2026)

What customers like about Medisana AH 661?

  • Whisper-quiet operation makes it ideal for bedrooms and children's rooms.
  • Integrated pre-heating function effectively reduces germs and bacteria in the water.
  • Separate aromatherapy compartment allows easy addition of essential oils.
  • Large 3.5-liter water tank provides 10 to 14 hours of continuous operation.
  • Helpful safety features including automatic shut-off when the tank is empty.
  • Micro-fine ultrasonic atomization efficiently improves dry indoor air quality.
  • Features a built-in timer (2, 4, or 6 hours) and 3 selectable intensity settings.

What customers dislike about Medisana AH 661?

  • The 1.5-meter power cable is relatively short, limiting placement options near outlets.
  • Requires frequent and diligent cleaning to prevent mineral buildup and scaling.
  • Ultrasonic technology can create white dust if used with high-mineral tap water.
  • Power consumption is slightly high (75 Watts) when utilizing the pre-heating mist function.
  • The design of the upper handle feels somewhat weak when carrying a fully loaded tank.

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