The catch
Levoit AERO
A bagged routine means a consumable you must keep in stock on a recurring basis.
Side by side
Levoit AERO vs Shark Clean & Empty Cordless BU3521: AERO uses bags, and its included sofa brush is powered
Quick verdict
AERO suits you if you would rather swap a dust bag and want a powered furniture brush in the box. BU3521 suits you if skipping recurring bag purchases counts for more than station capacity. Its 1.3-liter reusable base is smaller than AERO’s 3.5-liter bag, yet capacity by itself does not tell you how often either needs attention.
Before you buy
Why, and what it costs you
With a shedding pet, how you dispose of dust counts for more than what the dock is called
Dirt leaves the handheld bin in both. AERO then keeps it in a replaceable bag, whereas BU3521 leaves you a reusable container to tip out. If opening dusty containers is what you object to, the Shark just moves that job to the dock and does not change the basic method.
Where this comes from
Levoit AERO: Bagged station. Shark Clean & Empty Cordless BU3521: Bagless station.
The catch
Shark Clean & Empty Cordless
Loose-dust disposal and upkeep still apply to the smaller reusable base.
Levoit AERO
- Why pick it
- Lifting out a bag is better to you than tipping loose dust from a bin.
- A 3.5-liter bag sits in the station, and the kit comes with a mini motorized brush.
- The catch
- A bagged routine means a consumable you must keep in stock on a recurring basis.
Shark Clean & Empty Cordless
- Why pick it
- You want automatic emptying and no replacement bags to buy.
- Shorter daily floor rounds suit its reusable 1.3-liter base.
- The catch
- Loose-dust disposal and upkeep still apply to the smaller reusable base.
We may earn a commission from qualifying Amazon purchases. How we make money
What this page compares
Levoit AERO vs Shark BU3521 is about everyday crumbs and pet hair. Compare bagged disposal, furniture tools and the dock you will have to maintain.
Which one fits
Pick the situations that sound like you
Not wanting to keep buying dust bags
The Shark’s collection bin is reusable.
- Levoit AERO
- Depends
- Shark Clean & Empty Cordless
- Better fit
Not having to tip out loose dust
A replaceable bag is what Levoit uses.
- Levoit AERO
- Better fit
- Shark Clean & Empty Cordless
- Depends
The box has to include a powered sofa brush
The attachment you need is explicitly included with AERO.
- Levoit AERO
- Better fit
- Shark Clean & Empty Cordless
- Depends
Assuming either dock can deal with liquid spills
Each is a dry vacuum system.
- Levoit AERO
- Not suitable
- Shark Clean & Empty Cordless
- Not suitable
In practice
Differences you will notice
With a shedding pet, how you dispose of dust counts for more than what the dock is called
Dirt leaves the handheld bin in both. AERO then keeps it in a replaceable bag, whereas BU3521 leaves you a reusable container to tip out. If opening dusty containers is what you object to, the Shark just moves that job to the dock and does not change the basic method.
How we worked this out
Levoit AERO: Bagged station. Shark Clean & Empty Cordless BU3521: Bagless station.
A 2.7-times capacity ratio will not tell you when to clean
About 2.7 is what you get from dividing 3.5 by 1.3. It compares nominal volume and does not prove 2.7 times as many days between changes. Bulky fur, dense crumbs and the way each station packs debris can all alter the useful interval.
How we worked this out
Levoit AERO: 3.5-liter nominal bag volume. Shark Clean & Empty Cordless BU3521: 1.3-liter nominal dock-bin volume.
Count the sofa attachment when you compare prices
If this will be your only vacuum, AERO’s powered mini-brush is a separate reason to look at the bundle. Before deciding that a less expensive dock package covers the same jobs, confirm the tool in the BU3521 offer you pick and the cost of a compatible alternative.
How we worked this out
Levoit AERO: Included mini motorized brush. Shark Clean & Empty Cordless BU3521: Selected BU3521 accessory list must be checked.
Option A
Levoit, AERO
AERO
A light stick that comes with a bagged 3.5-liter auto-empty station and a tool-free way to use a spare battery.
- Best for
- Lifting out a bag is better to you than tipping loose dust from a bin.
Facts we checked
- Dock disposal: 3.5-liter replaceable bag
- Nominal capacity gap: 2.2 liters more
- Furniture brush: Mini motorized brush included
- Ongoing consumable: Replacement station bags
Option B
Shark, BU3521
Clean & Empty Cordless
Straightforward and lower in cost, this Shark detects the floor and sits on a compact bagless auto-empty base.
- Best for
- You want automatic emptying and no replacement bags to buy.
Facts we checked
- Dock disposal: 1.3-liter reusable bin
- Nominal capacity gap: Smaller reusable container
- Furniture brush: Check exact accessory package
- Ongoing consumable: No station bag
Spec by spec
Where they really differ
| Spec | Levoit AERO | Shark Clean & Empty Cordless | In practice |
|---|---|---|---|
| Dock disposal | 3.5-liter replaceable bag | 1.3-liter reusable bin | Settle on the final disposal routine first, and compare size afterward. |
| Nominal capacity gap | 2.2 liters more | Smaller reusable container | The ratio comes to approximately 2.7 to one, across different disposal systems. |
| Furniture brush | Mini motorized brush included | Check exact accessory package | Whether it empties itself tells you nothing about powered cushion cleaning. |
| Ongoing consumable | Replacement station bags | No station bag | You still have to clean the reusable container. |
Trade-offs
What each pick costs you
With Levoit AERO
- You need to keep buying bags and give the station permanent floor space.
With Shark Clean & Empty Cordless
- The base holds less debris than IP3251 does, and you still dispose of the dust by hand.
Change of plan
When the answer changes
Lifting out a bag is better to you than tipping loose dust from a bin.
Go with Levoit AERO. A 3.5-liter bag sits in the station, and the kit comes with a mini motorized brush.
You want automatic emptying and no replacement bags to buy.
Go with Shark Clean & Empty Cordless. Shorter daily floor rounds suit its reusable 1.3-liter base.
By the numbers
What the data shows
What we found across the cordless vacuums we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Levoit AERO |
|
| |
| Shark Clean & Empty Cordless |
|
|
Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Levoit AERO
Lifting out a bag is better to you than tipping loose dust from a bin.
See price & reviews on AmazonShark Clean & Empty Cordless
You want automatic emptying and no replacement bags to buy.
See price & reviews on AmazonEach link opens in a new tab.
We may earn a commission from qualifying Amazon purchases. How we make money