Multi K9 vs BU3521UK Cordless Vacuums

Torn between Multi K9 and BU3521UK for your next cordless vacuum?

We examine the Multi K9 – a battery-power vacuum by Gtech, comparing runtime, dust tank, and costs, with – BU3521UK by Shark, analysing real-world vacuuming performance.

By assessing these vacuums – the Multi K9 and BU3521UK from GTECH and SHARK, you get the best floorcare machine.

Best Cordless Vacuum Pick

GTECH Multi K9 vs SHARK BU3521UK – key Specifications

Multi K9 and BU3521UK Cordless Battery Run Time

GTECH Handheld cordless vacuums, like the Multi K9, 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 Gtech Multi K9 which has 20 minutes life.

• GTECH Multi K9 Runtime: 20 mins continuous vacuuming
• SHARK BU3521UK Runtime: 40 mins continuous vacuuming

Charging times between the Multi K9 and BU3521UK varies – check manual.

Cordless Vacuum Dust Tank Capacity

Both Gtech Multi K9 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 Multi K9 by GTECH has a capable capacity of 0.4 litre for manual disposable.

• Multi K9 onboard dirt/dust tank size: 0.4L
• BU3521UK onboard dirt/dust tank size: 0.42L

Floor Cleaning Types

Gtech’s Multi K9 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 Multi K9 can’t vacuum liquids. For this, a SHARK or GTECH ‘wet and dry’ vacuum is needed.

Most Gtech and Shark battery powered vacuums include accessories. Check Multi K9 or BU3521UK manual for specifications and attachments.

Vacuum Filtration

The BU3521UK and GTECH Multi K9 include effective filters to capture dust, dander, pollen, hairs, and fibres.

GTECH and SHARK use HEPA, foam, or cloth, filters. Multi K9 and BU3521UK maintain suction and clean exhaust air.

SHARK and GTECH Reviews

Combined feedback from 5,923 reviewers shows the Multi K9 with a rating of 4.8/5 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
GTECH	Multi K9	20 M	1.5	0.4L	£199.00
SHARK	BU3521UK	40 M	2.7	0.42L	£349.99