Series 4 Flexxo Gen2 BBH3285GB vs BU3521UK Cordless Vacuums

Torn between Series 4 Flexxo Gen2 BBH3285GB and BU3521UK for your next cordless vacuum?

We examine the Series 4 Flexxo Gen2 BBH3285GB – a battery-power vacuum by Bosch, comparing runtime, dust tank, and costs, with – BU3521UK by Shark, analysing real-world vacuuming performance.

By assessing these vacuums – the Series 4 Flexxo Gen2 BBH3285GB and BU3521UK from BOSCH and SHARK, you get the best floorcare machine.

Best Cordless Vacuum Pick

BOSCH Series 4 Flexxo Gen2 BBH3285GB vs SHARK BU3521UK – key Specifications

Series 4 Flexxo Gen2 BBH3285GB and BU3521UK Cordless Battery Run Time

BOSCH Stick cordless vacuums, like the Series 4 Flexxo Gen2 BBH3285GB, 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 Bosch Series 4 Flexxo Gen2 BBH3285GB which has 55 minutes life.

• BOSCH Series 4 Flexxo Gen2 BBH3285GB Runtime: 55 mins continuous vacuuming
• SHARK BU3521UK Runtime: 40 mins continuous vacuuming

Charging times between the Series 4 Flexxo Gen2 BBH3285GB and BU3521UK varies – check manual.

Cordless Vacuum Dust Tank Capacity

Both Bosch Series 4 Flexxo Gen2 BBH3285GB and Shark BU3521UK are bagless, storing dust, hairs, dirt, and debris inside a sealed 0.4 litre and 0.42 litre tank, respectively. The BU3521UK by SHARK holds up to 0.42 Litre of compressed dirty particles. The Series 4 Flexxo Gen2 BBH3285GB by BOSCH has a capable capacity of 0.4 litre for manual disposable.

• Series 4 Flexxo Gen2 BBH3285GB onboard dirt/dust tank size: 0.4L
• BU3521UK onboard dirt/dust tank size: 0.42L

Floor Cleaning Types

Bosch’s Series 4 Flexxo Gen2 BBH3285GB 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 Series 4 Flexxo Gen2 BBH3285GB can’t vacuum liquids. For this, a SHARK or BOSCH ‘wet and dry’ vacuum is needed.

Most Bosch and Shark battery powered vacuums include accessories. Check Series 4 Flexxo Gen2 BBH3285GB or BU3521UK manual for specifications and attachments.

Vacuum Filtration

The BU3521UK and BOSCH Series 4 Flexxo Gen2 BBH3285GB include effective filters to capture dust, dander, pollen, hairs, and fibres.

BOSCH and SHARK use HEPA, foam, or cloth, filters. Series 4 Flexxo Gen2 BBH3285GB and BU3521UK maintain suction and clean exhaust air.

SHARK and BOSCH Reviews

Combined feedback from 12 reviewers shows the Series 4 Flexxo Gen2 BBH3285GB with a rating of 4.6/5 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
BOSCH	Series 4 Flexxo Gen2 BBH3285GB	55 M	3	0.4L	£179.00
SHARK	BU3521UK	40 M	2.7	0.42L	£349.99