# Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock

The Shark Clean & Empty BU3521UKTSB is a cordless stick vacuum supplied with an auto-empty charging dock and several cleaning tools. Its practical draw is reduced manual dust-bin emptying, while the stated 40-minute runtime applies only in ECO mode with a non-motorised tool.

- [Original product page](https://bargainpostbox.co.uk/product/shark-clean-empty-bu3521uktsb-cordless-vacuum)
- [View offer](https://bargainpostbox.co.uk/visit/shark-clean-empty-bu3521uktsb-cordless-vacuum)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: Shark
- Model: Shark Clean & Empty
- Category: Home & Kitchen > Vacuum Cleaners & Floor Care > Vacuum Cleaners
- Price: 199.99 GBP
- Previous price: 349.99 GBP
- Discount: 43%
- Price checked: 2026-11-14T10:10:13.120Z
- Rating: 4.3 / 5
- Reviews: 687

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Auto-empty base is stated to hold dirt and debris for up to 30 days, reducing how often the vacuum needs manual emptying.
- The manufacturer claims the sealed base traps up to 99.9% of dust and allergens, citing an IEC test condition in its feature text.
- Anti Hair Wrap brush-roll is described as self-cleaning and automatically adjusting for carpets and hard floors.
- Detachable handheld vacuum and supplied tools support cleaning beyond floors.
- The stated maximum runtime is conditional: ECO mode with a non-motorised tool.

## Pros

- Auto-empty charging dock can make routine disposal less frequent than with a manually emptied bin.
- Detachable handheld mode and the listed tools cover floor, upholstery and crevice cleaning tasks.
- Two speeds and two power levels are listed for adjusting operation.

## Specifications

### Identity
- Brand: Shark
- Model: Shark Clean & Empty
### Cleaning and filtration
- Filter type: HEPA Filter
- Surfaces listed: Carpets, Hard Floors, Upholstory, in Car, All Floors
- Recommended uses: Floor, Pet Hair
- Dust capacity: 1.3 litres
### Power and battery
- Power configuration: Battery Powered
- Runtime: 40 minutes
- Number of speeds: 2
- Voltage: 240 Volts
- Wattage: 240 watts
### Dimensions and installation
- Form factor: Stick
- Weight listed: 2.7 Kilograms
- Dimensions: 35.3L x 26.4W x 109.2H centimetres
- Portable: Yes
- Indoor/outdoor use: Indoor
### Design
- Colour: Mohogany
- Country of origin: China

## Before you buy

- The listing gives a 1.3-litre capacity without clearly distinguishing the base from the vacuum in its details, while feature text specifies 1.3L for the base and 0.42L for the vacuum. It also lists Mohogany as the colour, while feature text says White/Mohogany. The 40-minute runtime is only claimed in ECO mode with a non-motorised tool, and the up-to-30-day base interval is a manufacturer claim, not a guaranteed schedule. Confirm the selected listing's configuration and colour.

## In the box

- Anti-Allergen Brush (Included)
- Auto-Empty Charging Dock (Included)
- Crevice Tool (Included)
- Motorised Hand Tool (Included)
- Multi-Surface Tool (Included)

## A good fit for

- Households wanting an auto-empty dock to reduce frequent manual bin emptying.
- Buyers looking for a cordless stick vacuum that converts to handheld use and includes several cleaning tools.
- Homes with carpets and hard floors where an anti-hair-wrap brush and automatic floor adjustment are useful.

## Less suited to

- Anyone relying on 40 minutes of runtime while using a motorised tool or a higher-power mode.
- Buyers who need a clearly stated vacuum-bin capacity without resolving the listing's conflicting capacity descriptions.

## Customer feedback

Customer feedback reports positive experiences with cleaning performance, ease of use, lightness, suction and the self-emptying feature, including cleaning kitchen dirt and cat litter. Battery-life experiences are mixed, which matters if you need long sessions away from the dock. The stated 40-minute figure applies only in ECO mode with a non-motorised tool, so it should not be treated as a general runtime. Aggregate ratings lean positive but include a noticeable low-star share, and ratings alone do not explain the reasons behind individual experiences.
- Positive themes: Customers report effective everyday cleaning and appreciate the self-emptying feature.
- Positive themes: Feedback also highlights ease of use, lightness and suction.
- Mixed feedback: Battery-life experiences are mixed.

## Frequently asked questions

### How long does the Shark Clean & Empty run on a charge?
The listing states up to 40 minutes in ECO power mode with a non-motorised tool. It does not establish that duration for other modes or motorised tools.
### What does the auto-empty dock do?
The manufacturer says the sealed base stores dirt and debris for up to 30 days and traps up to 99.9% of dust and allergens. These are listing claims, not independently verified performance.
### Can it clean both carpets and hard floors?
The listing names carpets and hard floors, and describes an anti-hair-wrap brush-roll that adjusts automatically to floor type.
### What tools are listed as included?
The listed components include an Anti-Allergen Brush, Auto-Empty Charging Dock, Crevice Tool, Motorised Hand Tool and Multi-Surface Tool.

## Alternative options

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## Images

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 1](https://bargainpostbox.co.uk/i/vTrmjWqamQNBUR3GGDxqDnes7iP9LwAavOD6ce6G2w9ywQPEPq2JyQcDCVu-slpVVh8fdOqbCBqPSDMKwPkluOEldCAgAwoeXZLmanU1ADrhoU0iRm1bjQQu.jpg)

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 2](https://bargainpostbox.co.uk/i/qt2aTmrOneukqMe4XxBiwdjP4hXb0m-tWDKvrnPLlpS_ohk3tPI9MBzpzV2Q1VVYbZh81aNuUZwcGqhaohC-Hj1iUiAYLCWqoL3ZaC0S-wDc6hlbXH3vIBMO.jpg)

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 3](https://bargainpostbox.co.uk/i/bsKEwjoevr1rn3NX-9HpNCfvFsLkSwegWr5wYrwF6-ZgOdIDeTxK1FQavd7h7sTGfeXsrOsvSQUphxQZfm7NTM0RN2MaDBXs5q70lQOApkVx5Cw1i0ftJ-c3.jpg)

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 4](https://bargainpostbox.co.uk/i/dDvtyOr2IVwgxx4vZqbgBZ2VLfH4GIZH6zP-_ma5L49buCs8GoZtN41GoAqfCz8YKoCWNei3EKWOAzVE2cmu6vO_FJRGxc00hrfiSiAQ2s9qfHcBuwBwZ6Ku.jpg)

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 5](https://bargainpostbox.co.uk/i/2ovYyzvSQIDXIZ462bdPUeoKOdnWBULM8Jbiq6Q0G6RG7M6xvF7DNEzulFzHNJyH7wUDsDxxWS5eEbpwQCG1k4UPEbwEBxeGgYKxrjFpnJQp99e6AUPawXlI.jpg)

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 6](https://bargainpostbox.co.uk/i/tVxNAPL7iBGYJeYuG7VyDb0GSrMhZVmZFfET-IsJjIo5AHwf9R6hZF1eTE7l6FDkebkyOEZWsByA1YWR9AKp1LrVvfKUpye7368jFZzw3cQuDLYcBQCv1Wos.jpg)

![Shark Clean & Empty BU3521UKTSB cordless vacuum with auto-empty dock — 7](https://bargainpostbox.co.uk/i/bN73zQx-nTCxgmykQzgH3vw7e4sglFAVmxQi8pwGe6IODvEMyW3pm_lX4yzet9PfYmTO3ZtMsaRjMr94kZ9bCKvSn6XM0PTmkrmQg4yeGrAmKtXW_XAdrsZ4.jpg)