Shark Clean & Empty Cordless Vacuum Cleaner with Auto-Empty
265/4564£199.99
*- Save £150.00Was £350.00
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About this product
Meet the cordless vacuum that empties itself, so you don't have to. After every clean, Shark Clean & Empty automatically deposits the dirt into a completely sealed base that holds dirt and debris for up to 30 days – so you can forget about emptying for weeks at a time. No more manual emptying after every clean. Enjoy powerful cleaning results on carpets and hard floors with an auto-adjusting brush-roll. Easily detach the handheld vacuum to clean anywhere with the included Crevice and Pet Tools.
Auto-Empty System automatically empties the vacuum into a large bagless base after every clean.
Fine dust particles are sealed away inside the base.
Auto-adjusts brush-roll for carpets and hard floors.
LED headlights on the floorhead illuminate hidden debris around your home.
Floor suitability:
- Suitable for carpets and rugs.
- Suitable for deep pile carpet and rugs.
- Suitable for wool carpet.
- Suitable for hard floors.
- Suitable for laminate flooring.
- Suitable for upholstery.
- Suitable for stairs.
Vacuum cleaner features:
- Weight 2.65kg.
- Size H110.8, W26.4, D35.6cm.
- Charge time: 5 hours to fully charge.
- Running time from 1 minutes to 40 mins, depending on the setting used.
- Low battery indicator.
- Number of batteries in pack: 1.
- Detachable handheld included.
- Comes with a docking station.
- Power boost - clean with increased power.
- Washable filter - wash regularly to maintain suction.
- Motorised floor head - drives bristles in to carpet to remove ground in dirt.
- Includes crevice nozzle, .
- 21.6 volts.
- Noise level: 84dB.
Handheld vacuum cleaner features:
- 21.6 volts.
- 40 mins running time on full charge.
- Charging time: 300 minutes.
- Low battery indicator.
- Variable power.
- Total capacity 1.3 litres.
- Crevice Tool, 20cm Multi Surface Tool.
- Size H110.8, W26.4, D35.6cm.
- Weight 2.65kg.
General information:
- Model number: BU3521UK.
- Manufacturer's 5 year (2 year on batteries) guarantee.
- EAN: 0622356297622.
4.3
317 reviews
84%
Recommended this product
Customers Say
Lightweight, powerful suction, and convenient self-emptying are praised, but battery life and frequent blockages disappoint some users. Ideal for quick clean-ups and easy handling, though not perfect for carpets or pet hair.
An AI generated summary based on recent customer reviews
Each review is verified as authentic by our independent third party and we only publish reviews from customers or Argos Testers who have purchased or used the item. Customers are incentivised to submit product reviews as part of a prize draw.
Convenient, falls short of plug in's
Really convenient and easy to use, the self emptying is great. Where this falls short is it's power and hair from carpet pick up, it never picks up my wife's hair from the bedroom carpet, I have to get the old plug in out which defeats the point of buying this. It's great for quick daily clean, hard floor and certain carpets but some carpets it fails to pick up hair. Plus the overall cleaning performance of this compare to a plug in, there's no comparison this is no way near.
Tigers84
49
Light and power hoover, I love this
Vildom, 55 - 64
Plugs into normal socket and then empties itself
Brilliant machine really pleased with it
Sue, 65 or over
Excellent product
Arrived yesterday and so far I’m super happy with it, suction’s excellent, lightweight and easy to grab and clean up quick mess from children.
Jazzx, 25 - 34, Newcastle
No more tangled threads
Picks up the cotton threads from my sewing first time unlike my old Dyson and the anti wrap means no more untangling the brush head. It is light and so quick to use. The automatic emptying system is great.
R Wilson, London
Needs more get up and go
Handy it self empties but suction it lacks. Block's easily even with the smallest things. Not handy with young children. Biught for convenience but more of a hindrance
Looby lu, 35 - 44, Boston lincolnshire
very good cleaner
[This review was collected as part of a promotion.] excellent powerful cleaner and very convenient to store and use
p. rees, 65 or over, wales
Easy and Excellent Vacuum
Excellent Vacuum, really easy to use and strong suction. Having the holder and empty function is great and easy to use who stops having to empty on regular basis.
MMC1, 55 - 64, Glasgow
Very good purchase
I am very happy with my purchase and would recommend it to anyone
Robo 67, 65 or over
Use veryeasy
Fantastic I bought it for my bedrooms and the stairs lighter than my Dyson Whitchurch I keep downstairs Thank you
Spuggie, 65 or over
Here are some key differences between the two:
Dust container capacity:
IW4621UKT: 1.3 L dust container capacity.
BU3521UK: 0.42 L.
Overall battery runtime:
IW4621UKT: Up to 60 minutes.
BU3521UK: Up to 40 minutes.
Auto-empty base maximum capacity:
Shark IW4621UKT: Holds up to 45 days of dirt and debris.
Shark BU3521UK: Holds up to 30 days of dirt and debris.
Yes, the Auto-Empty dock is part of the Shark Clean & Empty vacuum.
The brushroll will not switch on on its own while the vacuum is in the upright position. The brushroll will only activate when you place your foot on the nozzle to disengage the lock.
Yes, the Shark BU3521UK comes with a 8" Duster Crevice Tool and a Pet Multi Tool which can be used to clean in small or tight areas.
The brush bar cannot be switched off entirely. We recommend testing the vacuum on an isolated area to prevent damaging sensitive fabrics.
The brush bar cannot be switched off entirely. We recommend testing the vacuum on an isolated area to prevent damaging sensitive fabrics.
The unit's base will include its own cable, which you will connect directly to the wall socket.
Inside the box of the Shark Cordless Stick Vacuum with Auto Empty System BU3521UK, you will discover an 8" Duster Crevice Tool.
This unit provides three flexible charging options. It can be charged by positioning the unit on the dock, inserting the charger into the port situated below the handle of the handheld vacuum, or directly charging the battery once it has been removed from the handheld.
Using a bag inside the Auto-Empty base is not advisable, as it could interfere with the proper extraction of dust and debris from the Handvac dust cup into the sealed base of the Auto-Empty dock following every clean.
The small print
*Prices correct as displayed but are subject to change.
The customer and brand answers you’ll see above are submitted independently. As we don’t review these answers, we can’t take responsibility for anything they may say. The responses from Argos colleagues are accurate at the time of publishing. For the latest info, you should check the product page.