Pet hair has a way of finding every surface in a home. It settles into carpet, clings to the stairs, and weaves itself around vacuum brushrolls until the machine sounds strained and the floor stays dirty. That last problem, hair wrapping around the brush, is one of the most common complaints about upright vacuums in homes with animals, and it’s the issue the Shark Navigator Swivel Pro Pet (model ZU51) was designed to address.
This listing is the green version sold as “Renewed,” which means some extra reading is in order before deciding anything. The sections below cover what the vacuum is built to do, how its features work in practice, who it may suit, what to weigh before choosing it, and what to look for on a Renewed listing in particular.
A quick note on perspective. I haven’t used this vacuum, so nothing here is a personal impression. It draws on retailer product pages, Shark’s own brand-expert answers on those pages, and general knowledge of how corded upright vacuums behave.
Why Corded Uprights Remain a Practical Choice
Cordless vacuums get most of the attention these days, but corded uprights have stuck around for good reasons. Power is continuous, so there’s no battery to monitor and no runtime cutoff partway through a room. The floor heads are typically wider than those on slim sticks, and the bins tend to hold more. For a household with plenty of carpet and a good deal of shedding, those traits can matter more than the convenience of going cordless.
The trade-offs are weight, a cord to manage, and less convenience for quick spot cleaning. The ZU51 sits in the middle of that spectrum: it’s a corded upright, but at 12.8 pounds by listed specification, it’s lighter than many full-size machines, and it uses a swivel steering design to make turning easier.
Meet the ZU51
The ZU51 belongs to Shark’s Navigator line, which has been a staple of the company’s corded upright offerings for years. Retailer listings describe this model as a bagless upright with a HEPA filter, a self-cleaning brushroll, and swivel steering. One retailer’s spec list gives dimensions of about 47.5 inches tall, 15.8 inches wide, and 16 inches deep, a weight of 12.8 pounds, a 25-foot cord, a cleaning path of 12 inches, and a dust cup capacity of 0.87 quart.
The “Renewed” label deserves its own section, which comes shortly. First, the features.
Key Features Explained
The Self-Cleaning Brushroll
This is the headline feature. Standard brushrolls collect long hair and fibers that wrap around the bristle bar, reducing performance and requiring you to cut tangles loose by hand. Shark’s approach uses anti-hair-wrap strips that make contact with a comb inside the head, so hair is gradually separated from the roll as it spins. According to a brand-expert answer on a retailer page, the contact between the strips and the comb creates a different sound than a traditional vacuum, which is worth knowing so it doesn’t alarm you the first time you hear it.
“Self-cleaning” is a design aim, not a guarantee that you’ll never touch the brushroll again. Very long hair, thread, ribbon, and similar items can still cause problems in any vacuum, so occasional checks are sensible. The manual explains how to access the brushroll and what to look for.
Swivel Steering
Swivel steering lets you guide the cleaning head with a twist of the wrist rather than pivoting the whole machine. It’s helpful around furniture legs, along baseboards, and in rooms with awkward layouts. It won’t make an upright as nimble as a canister or a stick, but compared with a rigid-steering upright, many people find it easier to maneuver.
Anti-Allergen Complete Seal and HEPA Filtration
Listings describe the ZU51 as using Anti-Allergen Complete Seal Technology along with a HEPA filter, and Shark’s materials state that this combination traps 99.9% of dust and allergens inside the vacuum, based on a standardized test (ASTM F1977) at particle sizes down to 0.3 microns. If air quality matters to you, those details are worth reading closely. A sealed system means air is intended to travel through the filters rather than leak out of gaps in the body, which is a different claim from simply having a HEPA filter inside.
Even so, no vacuum replaces a broader approach to dust and allergens. Washing bedding, controlling humidity, and cleaning regularly all play a role, and anyone with significant allergy or asthma symptoms should talk to a health professional rather than rely on appliance claims.
Bagless Dust Cup
The ZU51 is bagless, so there are no replacement bags to buy. Retail specs list the cup at about 0.87 quart. That’s a moderate size: fine for typical weekly cleaning in a small to mid-sized home, but you may find yourself emptying it more often in a house with heavy shedding or lots of carpet. As with any bagless design, emptying creates some dust, so holding the cup inside a trash bag or emptying it outside is sensible.
Pet Hair Pickup
The product name includes “Pet,” and descriptions highlight pet hair pickup, so it’s worth separating what that means from what it doesn’t. The self-cleaning brushroll, suction, and accessories are all aimed at the problems pets create, and listings for this model include tools such as a crevice tool and a pet hair tool. It isn’t a specialist machine, though, and results depend on your floors, your pet’s coat, and how regularly you empty the cup and maintain the filters.
Cord Length and Power
A 25-foot cord is listed for this model. That gives reasonable reach, but in bigger rooms or open layouts you’ll likely need to switch outlets. The listing also mentions 700 watts, which is a rating of input power and not a direct measure of cleaning effectiveness, so treat it as one data point among several.
Accessories
Retailer and refurbisher listings mention a crevice tool, a pet hair tool, and a dusting brush as included accessories. The exact contents can vary by seller, especially for Renewed units, so confirm what the listing says before ordering.
Understanding the “Renewed” Label
Renewed products are pre-owned, open-box, or returned items that have been inspected, tested, and, where necessary, refurbished before resale. They’re often priced below new equivalents, and for shoppers who want to save money or reduce waste, they can be worth a look. The specifics vary by seller and condition grade, so reading the fine print makes a real difference.
Points worth checking on the listing:
- Condition grade. Renewed listings often group items into categories describing cosmetic condition. These can differ significantly.
- Included accessories. Confirm that tools, filters, and any other parts are listed and whether they’re original.
- Filters. Washable filters can be reused, but they also wear, and a Renewed unit may arrive with filters in varying states. Check what the listing says about filters and whether replacements are sold separately.
- Warranty and return terms. New Shark vacuums are commonly listed with a five-year limited warranty, but that coverage generally doesn’t carry over to Renewed items. One refurbished-seller listing I reviewed mentioned a minimum 90-day warranty and the possibility of a generic box. Your listing’s terms may differ, so read them carefully.
- Packaging. Renewed items frequently arrive in plain or generic packaging.
- Seller information. Check who is selling and refurbishing the unit and what the page says about the process.
None of this makes a Renewed purchase better or worse. It simply means the details of the listing matter more than they would with a sealed retail box.
How It Can Be Used
Here are realistic scenarios where an upright of this type tends to be considered.
Homes with shedding pets. Dog and cat hair accumulates on rugs, furniture edges, and stairs. A self-cleaning brushroll, a pet hair tool, and a sealed filter system are designed for that kind of environment.
Households with mixed flooring. Many homes combine carpet with hardwood, tile, or laminate. A Shark representative’s answer on a retailer page says the vacuum can be used on wood floors and other hard surfaces as well as carpet. Check the manual for the recommended settings and any notes about brushroll use on delicate floors.
Weekly whole-home cleaning. A corded machine with a 25-foot cord and a moderately sized bin works well for scheduled cleaning sessions in small to medium homes.
Navigating furniture-heavy rooms. Swivel steering is useful around chairs, sofa legs, and tables, where a stiffer machine requires more effort.
Stairs and upholstery. With the included hose and accessories, an upright like this can reach beyond floor level. One thing to verify: product pages for related Navigator models mention Lift-Away or Powered Lift-Away features, but a Shark expert’s answer on one retailer page states that the ZU51 isn’t a Powered Lift-Away model, while one refurbished listing’s title says “Lift Away.” Because the descriptions conflict, check the specific Renewed listing and the manual to see exactly how above-floor cleaning works on the unit you’re considering.
Allergy-conscious routines. A sealed system with HEPA filtration can be one part of a plan to cut down on household dust, alongside other habits such as laundering bedding and cleaning regularly.
Pre-guest or seasonal cleaning. When a deeper clean is called for, a plug-in vacuum has no battery limit to worry about.
Who It May Be Suitable For
This kind of vacuum tends to line up well with:
- Pet owners dealing with hair on carpets, rugs, and stairs
- Households that prefer a corded machine and the steady power that comes with it
- Homes with a mix of carpet and hard floors
- Shoppers who want a bagless design to avoid ongoing bag costs
- People with allergy-related concerns who want a sealed system with HEPA filtration
- Shoppers comfortable reviewing condition grades and return terms on a Renewed listing
It may be less ideal for:
- People who want a very light machine. At about 12.8 pounds by listed specification, it’s lighter than many full-size uprights but heavier than a cordless stick.
- Anyone who wants headlights on the floor head. A Shark expert’s answer on a retailer page states the ZU51 doesn’t have headlights.
- Large homes with huge carpeted areas, where a bigger bin and wider head might save time.
- Shoppers who prioritize a long manufacturer warranty, since Renewed coverage usually differs from that on new units.
- Those who need lots of quick, spontaneous cleanups, where a cordless model may be more convenient.
Important Things to Consider
Weight and Storage
At roughly 47.5 inches tall, the vacuum needs a closet or corner with enough vertical clearance. Carrying a 12.8-pound machine up and down stairs is manageable for many people but not for everyone.
Cord Management
A 25-foot cord is workable, though you’ll move between outlets in larger spaces. Check that your layout and outlet locations suit that reach.
Bin Capacity
With a 0.87-quart cup, expect to empty the bin more often if you have heavy shedding or large rooms to clean.
Filter Care
Filters need periodic cleaning or replacement for the vacuum to maintain airflow and filtration. Check the manual for the schedule and for drying times if the filters are washable. On a Renewed unit, also check whether replacement filters are included or sold separately.
Noise
Corded uprights aren’t quiet, and the anti-hair-wrap strips make their own distinct sound as the brushroll spins. If noise sensitivity is a factor, look for decibel information in the manual or independent testing.
Hard-Floor Use
Some listings and brand answers say the vacuum works on hard floors, but the manual’s guidance on brushroll use and floor types is the authoritative source. Spinning brushes can scatter fine debris on some bare surfaces.
Warranty Differences
A new unit’s warranty terms don’t automatically apply to a Renewed one. Read the specific terms for this listing.
Model Variations
Shark sells several Navigator models with similar names and different features, such as Lift-Away versions, models with different dust cup sizes, and units with different accessory sets. Confirm that the model number on the listing is ZU51 and compare its features with what you actually need.
Comparing General Vacuum Categories
Rather than comparing brands, it’s more useful to compare categories and the priorities behind each.
Corded Bagless Upright (This Category)
Strengths: continuous power, wide cleaning head, no recurring bag costs, good fit for carpet and shedding pets.
Considerations: weight, cord management, filter maintenance, and less convenience for quick cleanups.
Bagged Upright
Strengths: emptying is often cleaner because dust leaves sealed in the bag.
Considerations: replacement bags are an ongoing cost, and you need to keep spares on hand.
Cordless Stick or Upright
Strengths: light, convenient, great for quick jobs and stairs.
Considerations: limited runtime, smaller bins, and batteries that age over time.
Canister Vacuum
Strengths: strong on stairs, bare floors, and above-floor surfaces thanks to a flexible hose and light floor head.
Considerations: two-part design that can be awkward to store and move around.
Robot Vacuum
Strengths: automated daily upkeep with minimal effort.
Considerations: limited on stairs and thick rugs, and still requires occasional manual cleaning.
Many households use more than one type. A corded upright for weekly deep cleaning, paired with a lighter option for daily touch-ups, is a common arrangement.
Practical Tips for Any Corded Upright
These are general habits, not claims about this specific unit.
- Read the manual before first use, especially the sections on brushroll care and filters.
- Empty the dust cup before it’s completely full to preserve airflow.
- Clean or replace filters on the schedule the manufacturer recommends, and let washable parts dry fully.
- Check the brushroll and hose periodically for tangles or blockages, even on self-cleaning designs.
- Work in slow, overlapping passes over carpet.
- Unplug the machine before clearing clogs or handling the brushroll.
- Wind the cord loosely when storing it to avoid kinks.
- Store the vacuum in a dry place.
Frequently Asked Questions
What does “self-cleaning brushroll” mean?
It refers to a design that uses anti-hair-wrap strips and a comb to separate hair from the brushroll as it spins. It’s meant to reduce tangles, though occasional manual checks are still sensible.
Is the ZU51 bagless?
Yes. Retail listings describe it as a bagless upright with a dust cup of about 0.87 quart.
Does it have a HEPA filter?
Listings describe a HEPA filter combined with Anti-Allergen Complete Seal Technology. Shark’s materials state it traps 99.9% of dust and allergens at particle sizes down to 0.3 microns, based on a standardized test.
Can it clean hard floors?
A Shark representative’s answer on a retailer page says yes, it can be used on wood and other hard surfaces as well as carpet. The manual has specific guidance on settings and care.
Does it have headlights?
According to a Shark expert’s answer on a retailer page, no.
Is it a Lift-Away model?
Sources conflict. A Shark expert answer says the ZU51 isn’t a Powered Lift-Away model, while one refurbisher’s listing title includes “Lift Away.” Check your specific listing and the manual before assuming a particular feature.
How long is the cord?
Retail specs list a 25-foot cord.
How heavy is it?
One retailer lists a weight of 12.8 pounds.
What accessories are included?
Listings I reviewed mention a crevice tool, a pet hair tool, and a dusting brush, though exact contents can vary by seller. Confirm what’s included for the Renewed unit you’re considering.
What does “Renewed” mean?
In general, it refers to a pre-owned or returned product that has been inspected and refurbished before resale. Condition grades, warranty, and return terms are listed on the individual page.
Is the warranty the same as a new unit’s?
Not necessarily. New Shark vacuums are commonly listed with a five-year limited warranty, but Renewed items often have different, shorter coverage. Read the terms for the listing in question.
How often should the filters be cleaned?
The manual provides intervals for your specific model. Heavier use and more pet hair generally call for more frequent attention.
Is it suitable for large homes?
That depends on the layout and flooring. A 25-foot cord and a moderate bin may mean more outlet changes and more frequent emptying in large spaces.
Setting Realistic Expectations
Product descriptions tend to emphasize what a vacuum can do and stay quiet about where it stops. A fair way to read the ZU51’s feature list is as a description of design intent. A self-cleaning brushroll, a sealed filtration system, swivel steering, and a corded power supply are sensible choices for a pet-oriented upright. How they perform in your home depends on your flooring, your pet’s coat, and how well you maintain the machine.
If you can, compare a few models’ spec pages, read the manual (Shark and most manufacturers post them online), and look for independent testing that explains how results were measured. Those details usually tell you more than a headline claim.
Conclusion
The Shark Navigator Swivel Pro Pet Upright Vacuum (ZU51) is a corded, bagless upright built around a few clear priorities: reducing hair wrap on the brushroll, sealing in dust and allergens, and making a full-size machine easier to steer. Its limits are just as clear. It’s heavier than a stick, tied to a cord, equipped with a moderately sized bin, and, according to Shark’s own expert, lacks headlights.
The Renewed label adds one more layer. It can appeal to shoppers who want to save money or avoid waste, but it calls for close reading of the condition grade, included accessories, warranty, and return terms.
Weighing those points against your floors, your pets, and your cleaning routine will tell you more than any spec sheet. If you’d like to look at current specifications, condition details, and availability, you can check more details on Amazon here.
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