V15 Extra vs BU3521UK Cordless Vacuums

Torn between V15 Extra and BU3521UK for your next cordless vacuum?

We examine the V15 Extra – a battery-power vacuum by Dyson, comparing runtime, dust tank, and costs, with – BU3521UK by Shark, analysing real-world vacuuming performance.

By assessing these vacuums – the V15 Extra and BU3521UK from DYSON and SHARK, you get the best floorcare machine.

Best Cordless Vacuum Pick

DYSON V15 Extra vs SHARK BU3521UK – key Specifications

V15 Extra and BU3521UK Cordless Battery Run Time

DYSON Stick cordless vacuums, like the V15 Extra, provides lightweight portability without mains cables. BU3521UK Stick is also cordlessly powered by a SHARK rechargeable battery.

The Shark BU3521UK has a battery supply runtime of 40 minutes of cleaning, compared to the Dyson V15 Extra which has 60 minutes life.

• DYSON V15 Extra Runtime: 60 mins continuous vacuuming
• SHARK BU3521UK Runtime: 40 mins continuous vacuuming

Charging times between the V15 Extra and BU3521UK varies – check manual.

Cordless Vacuum Dust Tank Capacity

Both Dyson V15 Extra and Shark BU3521UK are bagless, storing dust, hairs, dirt, and debris inside a sealed 0.77 litre and 0.42 litre tank, respectively. The BU3521UK by SHARK holds up to 0.42 Litre of compressed dirty particles. The V15 Extra by DYSON has a capable capacity of 0.77 litre for manual disposable.

• V15 Extra onboard dirt/dust tank size: 0.77L
• BU3521UK onboard dirt/dust tank size: 0.42L

Floor Cleaning Types

Dyson’s V15 Extra and Shark’s BU3521UK brush heads are effective on every surface – carpets & deep-pile rugs, hard floors (laminate, wood, tiles), vinyl, even upholstery, and stairs.

Their only limitation is the BU3521UK and V15 Extra can’t vacuum liquids. For this, a SHARK or DYSON ‘wet and dry’ vacuum is needed.

Most Dyson and Shark battery powered vacuums include accessories. Check V15 Extra or BU3521UK manual for specifications and attachments.

Vacuum Filtration

The BU3521UK and DYSON V15 Extra include effective filters to capture dust, dander, pollen, hairs, and fibres.

DYSON and SHARK use HEPA, foam, or cloth, filters. V15 Extra and BU3521UK maintain suction and clean exhaust air.

SHARK and DYSON Reviews

Combined feedback from 1,098 reviewers shows the V15 Extra with a rating of 4.7/5 stars, and the BU3521UK vacuum gains a 4.4/5 average from 128 reviews, showing comparable reliability results.

Brand	Model	Runtime	Weight	Tank	Best Price
DYSON	V15 Extra	60 M	3.1	0.77L	£649.00
SHARK	BU3521UK	40 M	2.7	0.42L	£349.99