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Shark IZ251UKT Review | 52 Data compared

Avg. price:~£330Suction power (AW):123.79 AWBattery runtime:80 minutesCapacity:0.7 LWeight:4.1 kg

Shark IZ251UKT Review: Compare 52 technical specifications and user reviews to see how this product ranks in the Vacuum Cleaners category and whether it is worth buying.

8.1

Overall score

Score
8.1/ 10
✕
What it is
An overall evaluation of the vacuum cleaner's quality, based on technical analysis and user reviews.
When it matters
When you need a quick reference for identifying the best vacuum cleaners on the market.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 92% of models
Score components

80%

7.9

Technical Score

20%

9.2

User score

★Better than 92% of vacuum-cleaners
7.9

Technical Score

Technical score
7.9/ 10
✕
What it is
An assessment of the vacuum cleaner's technical performance across six key areas: performance, battery and power supply, filtration, attachments, design, and smart features.
When it matters
When you want to compare vacuum cleaners by cleaning performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 85% of models
Score components

28%

6.9

Performance

22%

9.0

Battery

18%

8.6

Filtration

14%

9.2

Attachments

10%

6.8

Design

8%

5.2

Smart features

â–²Better than 85% of vacuum-cleaners
9.2

User score

User score
9.2/ 10
✕
What it is
A rating that combines user reviews with the total number of reviews received by the vacuum cleaner.
When it matters
When you want to know how a vacuum cleaner performs in everyday use and how reliable owners find it over time.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 98% of models
Score components

70%

9.2

User ratings

30%

9.3

Number of reviews

Based on 4,284 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
★Better than 98% of vacuum-cleaners
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Best prices

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Best rankings

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

The Shark IZ251UKT is a 25.2V cordless stick vacuum cleaner designed for multi-surface home cleaning and pet owners, weighing 4.1 kg and measuring 118 x 26 x 24.5 cm. Its defining characteristics include DuoClean and Anti Hair Wrap technologies, a HEPA filtration system, and an articulated Flexology wand that bends to reach under furniture and folds for compact storage. The model's major advantages are its generous 80-minute maximum runtime provided by two interchangeable 40-minute batteries, its exceptional efficiency at clearing embedded pet hair using the included motorized TruePet tool, and its integrated LED headlights that expose hidden dust. However, notable drawbacks include its small 0.4-litre dust capacity which demands frequent emptying, poor edge-to-edge pickup along baseboards, and a top-heavy design that prevents the vacuum from standing upright on its own when fully extended.

Technical Specifications of vacuum cleaner Shark IZ251UKT

Technical Score
Technical score
7.9/ 10
✕
What it is
An assessment of the vacuum cleaner's technical performance across six key areas: performance, battery and power supply, filtration, attachments, design, and smart features.
When it matters
When you want to compare vacuum cleaners by cleaning performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 85% of models
Score components:

28%

6.9

Performance

22%

9.0

Battery

18%

8.6

Filtration

14%

9.2

Attachments

10%

6.8

Design

8%

5.2

Smart features

7.9
Shark IZ251UKT has a technical score of 7.9 points, which is higher than 85.4% of vacuum cleaners.
User score
User score
9.2/ 10
✕
What it is
A rating that combines user reviews with the total number of reviews received by the vacuum cleaner.
When it matters
When you want to know how a vacuum cleaner performs in everyday use and how reliable owners find it over time.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 98% of models
Score components

70%

9.2

User ratings

30%

9.3

Number of reviews

Based on 4,284 buyer reviews from online shops.
Read buyer reviews on Amazon →
How we calculate this
User ratings – average star rating across all shop listings, weighted by how many reviews each has, on a 1–10 scale.
Number of reviews – how many buyer reviews the product has, on a logarithmic scale; the 8% most-reviewed models in the category get 10.
9.2
Shark IZ251UKT has a user score of 9.22 points, which is higher than 97.6% of vacuum cleaners.
Popularity
Popularity
9.3/ 10
✕
What it is
An indicator based on the number of reviews received by the vacuum cleaner.
When it matters
When you prefer a vacuum cleaner that has been chosen and reviewed by many other buyers.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 86% of models
Popularity:
Shark IZ251UKT has a popularity score of 9.3 points, which is higher than 85.7% of vacuum cleaners.
9.3
Shark IZ251UKT has a popularity score of 9.3 points, which is higher than 85.7% of vacuum cleaners.
Ratio quality/price
Value for money
8.3/ 10
✕
What it is
An indicator that combines the vacuum cleaner's overall score with its price.
When it matters
When you are looking for a vacuum cleaner with a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 88% of models
Score components:

60%

8.1

Overall score

40%

8.8

Price

8.3
Shark IZ251UKT has a value-for-money score of 8.3 points, which is higher than 88% of vacuum cleaners.
Suction power (AW)
123.79 AW
Suction power (AW)
123.79 AW
â–¼ Worse than 65% of models
Market range: <40 AW – >280 AW
This vacuum cleaner has a suction power of 123.79 AW, which is lower than that of 65.4% of vacuum cleaners.
Suction power (kPa)
?
Airflow
?
Motor type
brushless
Power consumption
450 W
Power consumption
450 W
â–² Better than 61% of models
Market range: <165 W – >899 W
This vacuum cleaner draws 450 W, which is lower than the power consumption of 60.7% of vacuum cleaners and equal to that of 3.2% of vacuum cleaners.
Show more
Cordless
yes
Cordless
yes
â–² Better than 51% of models
This vacuum cleaner works cordlessly. 49.5% of vacuum cleaners offer cordless operation.
Battery runtime
80 minutes
Battery runtime
80 minutes
★ Better than 91% of models
Market range: <30 minutes – >70 minutes
This vacuum cleaner offers a battery runtime of 80 minutes, which is longer than that of 91.1% of vacuum cleaners and equal to that of 2% of vacuum cleaners.
Charging time
3.5 hours
Charging time
3.5 hours
â–² Better than 69% of models
Market range: <3 hours – >5 hours
This vacuum cleaner charges in 3.5 hours, which is faster than 69.1% of vacuum cleaners and equal to 16.8% of vacuum cleaners.
Battery capacity
2,450 mAh
Battery capacity
2,450 mAh
â–¼ Worse than 52% of models
Market range: <2k mAh – >3.6k mAh
This vacuum cleaner has a battery capacity of 2,450 mAh, which is smaller than that of 52.2% of vacuum cleaners and equal to that of 0.8% of vacuum cleaners.
Battery voltage
25.2 V
Battery voltage
25.2 V
â–² Better than 56% of models
Market range: <18 V – >28.8 V
This vacuum cleaner uses a battery voltage of 25.2 V, which is higher than that of 56.5% of vacuum cleaners and equal to that of 23.5% of vacuum cleaners.
Show more
Filter class
hepa 12
Filter class
hepa 12
â–² Better than 74% of models
This vacuum cleaner uses filter class hepa 12, which is more advanced than the class used by 74.4% of vacuum cleaners and the same as the class used by 5% of vacuum cleaners.
Minimum overall efficiency
99.95%
Minimum overall efficiency
99.95%
â–¼ Worse than 41% of models
Market range: <95 % – >99.99 %
This vacuum cleaner reaches 99.95% minimum overall efficiency, which is higher than that of 32% of vacuum cleaners and equal to that of 26.9% of vacuum cleaners.
Suitable for allergy sufferers
yes
Suitable for allergy sufferers
yes
â–² Better than 18% of models
This vacuum cleaner is suitable for allergy sufferers. 82.4% of vacuum cleaners are allergy-friendly.
Capacity
0.7 L
Capacity
0.7 L
â–¼ Worse than 63% of models
Market range: <0.44 L – >4 L
This vacuum cleaner has a dust capacity of 0.7 L, which is smaller than that of 62.8% of vacuum cleaners and equal to that of 5.9% of vacuum cleaners.
Bagless
yes
Bagless
yes
â–² Better than 21% of models
This vacuum cleaner uses a bagless design. 78.6% of vacuum cleaners use this setup.
Show more
Main brush type
roll brush
Roller type
multi-surface
Anti-tangle brush
yes
Anti-tangle brush
yes
â–² Better than 74% of models
This vacuum cleaner includes an anti-tangle brush. 25.7% of vacuum cleaners include this feature.
Mini motorized brush
yes
Mini motorized brush
yes
â–² Better than 73% of models
This vacuum cleaner includes a mini motorized brush. 26.9% of vacuum cleaners include this attachment.
Suitable for pet owners
yes
Suitable for pet owners
yes
â–² Better than 28% of models
This vacuum cleaner is suitable for pet owners. 72% of vacuum cleaners handle pet hair well.
Show more
Vacuum type
stick
Weight
4.1 kg
Weight
4.1 kg
â–¼ Worse than 57% of models
Market range: <2.15 kg – >7.1 kg
This vacuum cleaner weighs 4.1 kg, which is greater than the weight of 57.2% of vacuum cleaners and equal to that of 1.5% of vacuum cleaners.
2-in-1 design
yes
2-in-1 design
yes
â–² Better than 47% of models
This vacuum cleaner offers a 2-in-1 design. 53% of vacuum cleaners offer this flexible format.
Self-standing
no
Self-standing
no
â–¼ Worse than 19% of models
This vacuum cleaner does not stand on its own. 18.9% of vacuum cleaners offer this convenience.
Adjustable tube height
no
Adjustable tube height
no
â–¼ Worse than 47% of models
This vacuum cleaner does not include adjustable tube height. 47.4% of vacuum cleaners offer this ergonomic feature.
Show more
Auto suction adjustment
no
Auto suction adjustment
no
â–¼ Worse than 20% of models
This vacuum cleaner does not support automatic suction adjustment. 19.9% of vacuum cleaners support this feature.
Dust particle sensor
no
Dust particle sensor
no
â–¼ Worse than 8% of models
This vacuum cleaner does not include a dust particle sensor. 8% of vacuum cleaners include this feature.
LED display
no
LED display
no
â–¼ Worse than 26% of models
This vacuum cleaner does not include an LED display. 25.9% of vacuum cleaners include this interface feature.
Nozzle light
yes
Nozzle light
yes
â–² Better than 57% of models
This vacuum cleaner includes a nozzle light. 43.4% of vacuum cleaners include this visibility feature.
Mopping support
no
Mopping support
no
â–¼ Worse than 4% of models
This vacuum cleaner does not support mopping. 3.7% of vacuum cleaners support this multi-function feature.

Shark IZ251UKT vs the average vacuum cleaner

246810TotalPerformanceBatteryFiltrationAttachmentsDesignSmart features
  • 30 minutes longer runtime
    Battery runtime
    80 minutes
    ★ Better than 91% of models
    Market range: <30 minutes – >70 minutes
    This vacuum cleaner offers longer battery runtime than the average vacuum cleaner (80 minutes vs 50 minutes).
    80 minutes vs 50 minutes
  • Cordless operation
    Cordless
    yes
    â–² Better than 51% of models
    This vacuum cleaner works cordlessly, the average vacuum cleaner does not.
  • Includes mini motorized brush
    Mini motorized brush
    yes
    â–² Better than 73% of models
    This vacuum cleaner includes a mini motorized brush, the average vacuum cleaner does not.
  • Includes anti-tangle brush
    Anti-tangle brush
    yes
    â–² Better than 74% of models
    This vacuum cleaner includes an anti-tangle brush, the average vacuum cleaner does not.
  • Higher filter class
    Filter class
    hepa 12
    â–² Better than 74% of models
    This vacuum cleaner uses a better filter class than the average vacuum cleaner (hepa 12 vs hepa).
    hepa 12 vs hepa
  • Includes removable battery
    Removable battery
    yes
    â–² Better than 61% of models
    This vacuum cleaner includes a removable battery, the average vacuum cleaner does not.
  • Includes nozzle light
    Nozzle light
    yes
    â–² Better than 57% of models
    This vacuum cleaner includes a nozzle light, the average vacuum cleaner does not.
  • 0.5 hours faster charging
    Charging time
    3.5 hours
    â–² Better than 69% of models
    Market range: <3 hours – >5 hours
    This vacuum cleaner charges faster than the average vacuum cleaner (3.5 hours vs 4 hours).
    3.5 hours vs 4 hours
  • 15.2% higher user score
    User score
    9.2/ 10
    ✕
    What it is
    A rating that combines user reviews with the total number of reviews received by the vacuum cleaner.
    When it matters
    When you want to know how a vacuum cleaner performs in everyday use and how reliable owners find it over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    Shark IZ251UKT
    the average vacuum cleaner
    ★ Better than 97% of models
    Shark IZ251UKT has a higher user score than the average vacuum cleaner (9.22 vs 8.000).
    9.22 vs 8
  • 8.8% better value for money
    Shark IZ251UKT offers better value for money than the average vacuum cleaner (8.32 vs 7.6).
    8.32 vs 7.65
  • 150 W lower power consumption
    Power consumption
    450 W
    â–² Better than 61% of models
    Market range: <165 W – >899 W
    This vacuum cleaner draws less power than the average vacuum cleaner (450 W vs 600 W).
    450 W vs 600 W
  • 30 minutes longer runtime
    Battery runtime
    80 minutes
    ★ Better than 91% of models
    Market range: <30 minutes – >70 minutes
    This vacuum cleaner offers longer battery runtime than the average vacuum cleaner (80 minutes vs 50 minutes).
    80 minutes vs 50 minutes
  • Cordless operation
    Cordless
    yes
    â–² Better than 51% of models
    This vacuum cleaner works cordlessly, the average vacuum cleaner does not.
  • Includes removable battery
    Removable battery
    yes
    â–² Better than 61% of models
    This vacuum cleaner includes a removable battery, the average vacuum cleaner does not.
  • 0.5 hours faster charging
    Charging time
    3.5 hours
    â–² Better than 69% of models
    Market range: <3 hours – >5 hours
    This vacuum cleaner charges faster than the average vacuum cleaner (3.5 hours vs 4 hours).
    3.5 hours vs 4 hours
  • Includes battery indicator
    Battery level indicator
    yes
    â–² Better than 53% of models
    This vacuum cleaner includes a battery level indicator, the average vacuum cleaner does not.
  • 3 V higher voltage
    Battery voltage
    25.2 V
    â–² Better than 56% of models
    Market range: <18 V – >28.8 V
    This vacuum cleaner has a higher battery voltage than the average vacuum cleaner (25.2 V vs 22.2 V).
    25.2 V vs 22.2 V
  • Higher filter class
    Filter class
    hepa 12
    â–² Better than 74% of models
    This vacuum cleaner uses a better filter class than the average vacuum cleaner (hepa 12 vs hepa).
    hepa 12 vs hepa
  • Includes mini motorized brush
    Mini motorized brush
    yes
    â–² Better than 73% of models
    This vacuum cleaner includes a mini motorized brush, the average vacuum cleaner does not.
  • Includes anti-tangle brush
    Anti-tangle brush
    yes
    â–² Better than 74% of models
    This vacuum cleaner includes an anti-tangle brush, the average vacuum cleaner does not.
  • Includes foldable tube
    Foldable tube
    yes
    â–² Better than 88% of models
    This vacuum cleaner includes a foldable tube, the average vacuum cleaner does not.
  • Includes nozzle light
    Nozzle light
    yes
    â–² Better than 57% of models
    This vacuum cleaner includes a nozzle light, the average vacuum cleaner does not.
  • 0.3 L smaller dust container
    Capacity
    0.7 L
    â–¼ Worse than 63% of models
    Market range: <0.44 L – >4 L
    This vacuum cleaner has a smaller dust capacity than the average vacuum cleaner (0.7 L vs 1 L).
    0.7 L vs 1 L
  • 26.21 AW lower suction power
    Suction power (AW)
    123.79 AW
    â–¼ Worse than 65% of models
    Market range: <40 AW – >280 AW
    This vacuum cleaner has lower suction power than the average vacuum cleaner (123.8 AW vs 150 AW).
    123.79 AW vs 150 AW
  • More operating noise
    Noise level (Min-Max)
    75-79 dB
    â–² Better than 50% of models
    Market range: <65 dB – >83 dB
    This vacuum cleaner is noisier than the average vacuum cleaner (75-79 dB vs 77-77 dB).
    75-79 dB vs 77-77 dB
  • 2.2x more expensive
    Shark IZ251UKT is more expensive than the average vacuum cleaner (£330 vs £150).
    £330 vs £150
  • 2 minutes shorter turbo runtime
    Turbo mode runtime
    10 minutes
    â–¼ Worse than 57% of models
    Market range: <6 minutes – >20 minutes
    This vacuum cleaner offers shorter turbo runtime than the average vacuum cleaner (10 minutes vs 12 minutes).
    10 minutes vs 12 minutes
  • 13.3% higher weight
    Weight
    4.1 kg
    â–¼ Worse than 57% of models
    Market range: <2.15 kg – >7.1 kg
    This vacuum cleaner is heavier than the average vacuum cleaner (4.1 kg vs 3.62 kg).
    4.1 kg vs 3.62 kg
  • 50 mAh smaller battery capacity
    Battery capacity
    2,450 mAh
    â–¼ Worse than 52% of models
    Market range: <2k mAh – >3.6k mAh
    This vacuum cleaner has a smaller battery capacity than the average vacuum cleaner (2450 mAh vs 2500 mAh).
    2,450 mAh vs 2,500 mAh
  • 80 mm taller body
    Height
    1,180 mm
    â–¼ Worse than 80% of models
    Market range: <290 mm – >1.2k mm
    This vacuum cleaner is taller than the average vacuum cleaner (1180 mm vs 1100 mm).
    1,180 mm vs 1,100 mm
  • 2.2x more expensive
    Shark IZ251UKT is more expensive than the average vacuum cleaner (£330 vs £150).
    £330 vs £150
  • 26.21 AW lower suction power
    Suction power (AW)
    123.79 AW
    â–¼ Worse than 65% of models
    Market range: <40 AW – >280 AW
    This vacuum cleaner has lower suction power than the average vacuum cleaner (123.8 AW vs 150 AW).
    123.79 AW vs 150 AW
  • More operating noise
    Noise level (Min-Max)
    75-79 dB
    â–² Better than 50% of models
    Market range: <65 dB – >83 dB
    This vacuum cleaner is noisier than the average vacuum cleaner (75-79 dB vs 77-77 dB).
    75-79 dB vs 77-77 dB
  • 2 minutes shorter turbo runtime
    Turbo mode runtime
    10 minutes
    â–¼ Worse than 57% of models
    Market range: <6 minutes – >20 minutes
    This vacuum cleaner offers shorter turbo runtime than the average vacuum cleaner (10 minutes vs 12 minutes).
    10 minutes vs 12 minutes
  • 50 mAh smaller battery capacity
    Battery capacity
    2,450 mAh
    â–¼ Worse than 52% of models
    Market range: <2k mAh – >3.6k mAh
    This vacuum cleaner has a smaller battery capacity than the average vacuum cleaner (2450 mAh vs 2500 mAh).
    2,450 mAh vs 2,500 mAh
  • 0.3 L smaller dust container
    Capacity
    0.7 L
    â–¼ Worse than 63% of models
    Market range: <0.44 L – >4 L
    This vacuum cleaner has a smaller dust capacity than the average vacuum cleaner (0.7 L vs 1 L).
    0.7 L vs 1 L
  • 13.3% higher weight
    Weight
    4.1 kg
    â–¼ Worse than 57% of models
    Market range: <2.15 kg – >7.1 kg
    This vacuum cleaner is heavier than the average vacuum cleaner (4.1 kg vs 3.62 kg).
    4.1 kg vs 3.62 kg
  • 80 mm taller body
    Height
    1,180 mm
    â–¼ Worse than 80% of models
    Market range: <290 mm – >1.2k mm
    This vacuum cleaner is taller than the average vacuum cleaner (1180 mm vs 1100 mm).
    1,180 mm vs 1,100 mm
  • Older release date
    Release date
    2019
    â–¼ Worse than 67% of models
    Market range: <2k – >2k
    This vacuum cleaner has an older release date than the average vacuum cleaner (2019 vs 2021).
    2019 vs 2021

Graphic comparison of Shark IZ251UKT and other vacuum cleaners

No results found

Third-party reviews

Based on 4,284 buyer reviews from online shops.
Reviews last updated: July 2026 · How we calculate this
Read buyer reviews on Amazon →

What customers like about Shark IZ251UKT?

  • DuoClean floorhead works seamlessly across carpets and hard floors without changing heads
  • Anti-hair wrap technology successfully prevents long human and pet hair from tangling on the brush-roll
  • Flexology wand bends easily to reach beneath low furniture like beds and sofas
  • Folds down completely for compact, freestanding storage without needing wall mounts
  • Twin battery design provides up to 80 minutes of runtime and offers convenient dual charging
  • Converts effortlessly into a lightweight handheld vacuum for cars and stairs
  • Bright front LED headlights illuminate hidden dust and debris in dark corners
  • Motorised pet tool is highly effective at lifting embedded pet hair from upholstery

What customers dislike about Shark IZ251UKT?

  • Can feel top-heavy and strain the wrist during extended cleaning sessions
  • Dust container capacity of 0.7 litres is relatively small and requires frequent emptying
  • Suction power in standard eco mode can feel weak, requiring frequent use of the battery-draining boost trigger
  • Filters clog quickly with fine dust and need regular washing to maintain suction performance
  • The physical body of the unit does not stand upright on its own unless fully folded down
  • Anti-hair wrap mechanism is less effective for exceptionally long or thick pet hair, still requiring manual cleaning occasionally

Expert reviews

In-depth analysis and verdict from leading tech publications

T
trustedreviews.com
28/02/2020
Summary of the review
Shark Anti Hair Wrap Cordless Stick Vacuum Cleaner with Flexology and TruePet IZ251UKT Review
R
realhomes.com
05/04/2022
Summary of the review
Shark Anti Hair Wrap & DuoClean IZ251UKTDB cordless vacuum cleaner review
L
lesnumeriques.com
No specific date provided
Summary of the review
Shark [IZ251EU] Anti Hair Wrap, DuoClean, Flexology
(Translated)Show original

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

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