Freo Z10 Ultra vs BU3521UK Cordless Vacuums

Torn between Freo Z10 Ultra and BU3521UK for your next cordless vacuum?

We examine the Freo Z10 Ultra – a battery-power vacuum by Narwal, comparing runtime, dust tank, and costs, with – BU3521UK by Shark, analysing real-world vacuuming performance.

By assessing these vacuums – the Freo Z10 Ultra and BU3521UK from NARWAL and SHARK, you get the best floorcare machine.

Best Cordless Vacuum Pick

NARWAL Freo Z10 Ultra vs SHARK BU3521UK – key Specifications

Freo Z10 Ultra and BU3521UK Cordless Battery Run Time

NARWAL Robot cordless vacuums, like the Freo Z10 Ultra, 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 Narwal Freo Z10 Ultra which has 210 minutes life.

• NARWAL Freo Z10 Ultra Runtime: 210 mins continuous vacuuming
• SHARK BU3521UK Runtime: 40 mins continuous vacuuming

Charging times between the Freo Z10 Ultra and BU3521UK varies – check manual.

Cordless Vacuum Dust Tank Capacity

Both Narwal Freo Z10 Ultra and Shark BU3521UK are bagless, storing dust, hairs, dirt, and debris inside a sealed 0.3 litre and 0.42 litre tank, respectively. The BU3521UK by SHARK holds up to 0.42 Litre of compressed dirty particles. The Freo Z10 Ultra by NARWAL has a capable capacity of 0.3 litre for manual disposable.

• Freo Z10 Ultra onboard dirt/dust tank size: 0.3L
• BU3521UK onboard dirt/dust tank size: 0.42L

Floor Cleaning Types

Narwal’s Freo Z10 Ultra 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 Freo Z10 Ultra can’t vacuum liquids. For this, a SHARK or NARWAL ‘wet and dry’ vacuum is needed.

Most Narwal and Shark battery powered vacuums include accessories. Check Freo Z10 Ultra or BU3521UK manual for specifications and attachments.

Vacuum Filtration

The BU3521UK and NARWAL Freo Z10 Ultra include effective filters to capture dust, dander, pollen, hairs, and fibres.

NARWAL and SHARK use HEPA, foam, or cloth, filters. Freo Z10 Ultra and BU3521UK maintain suction and clean exhaust air.

SHARK and NARWAL Reviews

Combined feedback from 391 reviewers shows the Freo Z10 Ultra with a rating of 4.4/5 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
NARWAL	Freo Z10 Ultra	210 M	4.5	0.3L	£1,399.00
SHARK	BU3521UK	40 M	2.7	0.42L	£349.99