BU3521UK vs Flexi 3-in-1 VL70 Cordless Vacuums

Torn between BU3521UK and Flexi 3-in-1 VL70 for your next cordless vacuum?

We examine the BU3521UK – a battery-power vacuum by Shark, comparing runtime, dust tank, and costs, with – Flexi 3-in-1 VL70 by Tower, analysing real-world vacuuming performance.

By assessing these vacuums – the BU3521UK and Flexi 3-in-1 VL70 from SHARK and TOWER, you get the best floorcare machine.

Best Cordless Vacuum Pick

SHARK BU3521UK vs TOWER Flexi 3-in-1 VL70 – key Specifications

BU3521UK and Flexi 3-in-1 VL70 Cordless Battery Run Time

SHARK Stick cordless vacuums, like the BU3521UK, provides lightweight portability without mains cables. Flexi 3-in-1 VL70 Stick is also cordlessly powered by a TOWER rechargeable battery.

The Tower Flexi 3-in-1 VL70 has a battery supply runtime of 30 minutes of cleaning, compared to the Shark BU3521UK which has 40 minutes life.

• SHARK BU3521UK Runtime: 40 mins continuous vacuuming
• TOWER Flexi 3-in-1 VL70 Runtime: 30 mins continuous vacuuming

Charging times between the BU3521UK and Flexi 3-in-1 VL70 varies – check manual.

Cordless Vacuum Dust Tank Capacity

Both Shark BU3521UK and Tower Flexi 3-in-1 VL70 are bagless, storing dust, hairs, dirt, and debris inside a sealed 0.42 litre and 1 litre tank, respectively. The Flexi 3-in-1 VL70 by TOWER holds up to 1 Litre of compressed dirty particles. The BU3521UK by SHARK has a capable capacity of 0.42 litre for manual disposable.

• BU3521UK onboard dirt/dust tank size: 0.42L
• Flexi 3-in-1 VL70 onboard dirt/dust tank size: 1L

Floor Cleaning Types

Shark’s BU3521UK and Tower’s Flexi 3-in-1 VL70 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 Flexi 3-in-1 VL70 and BU3521UK can’t vacuum liquids. For this, a TOWER or SHARK ‘wet and dry’ vacuum is needed.

Most Shark and Tower battery powered vacuums include accessories. Check BU3521UK or Flexi 3-in-1 VL70 manual for specifications and attachments.

Vacuum Filtration

The Flexi 3-in-1 VL70 and SHARK BU3521UK include effective filters to capture dust, dander, pollen, hairs, and fibres.

SHARK and TOWER use HEPA, foam, or cloth, filters. BU3521UK and Flexi 3-in-1 VL70 maintain suction and clean exhaust air.

TOWER and SHARK Reviews

Combined feedback from 128 reviewers shows the BU3521UK with a rating of 4.4/5 stars, and the Flexi 3-in-1 VL70 vacuum gains a 4.3/5 average from 21 reviews, showing comparable reliability results.

Brand	Model	Runtime	Weight	Tank	Best Price
SHARK	BU3521UK	40 M	2.7	0.42L	£349.99
TOWER	Flexi 3-in-1 VL70	30 M	2.2	1L	£129.00