Viper AS430C vs AS510B vs AS5160 vs AS5160T vs Fang 15B: Which Viper Scrubber Fits?

Choose the Fang 15B for restrooms and small rooms, the corded AS430C for small sites with outlets close by, the AS510B for cordless daily scrubbing of midsize floors, the AS5160 when 16 gallon tanks save trips to the drain, and the AS5160T when long routes make pushing tiring. All five are 15 to 20 inch Viper walk-behind scrubbers built by Nilfisk.

If that settles it, the model names above go straight to each machine. If you're still weighing two of them, the rest of this Viper floor scrubber comparison covers the specs side by side, the two numbers buyers most often misread and what owners report after the first year.

How do the five Viper walk-behind scrubbers compare?

All five walk-behind floor scrubbers run a single round brush or pad, and every figure below comes from the Viper US full line catalog, checked against Nilfisk's own product page for each model.

Prices update live from our store. Batteries are optional on the AS5160 pair, so when you compare weights, set the AS5160 against the AS5160T rather than reading straight across the row.

Rated productivity is a ceiling, not a promise

Treat the productivity row as a ceiling rather than the pace your crew will actually reach. Nilfisk's own product pages print higher figures than its catalog: 17,222 square feet per hour for the AS430C against 12,739, and 22,604 for the AS510B against 15,748. The catalog figures are used here because they rate all five machines on the same basis, and your real pace will drop further once you add turns, furniture and stops to refill the solution tank.

The compact models press harder

Pad pressure is the row buyers most often misread, because you might expect the bigger floor scrubber to scrub harder. In fact the AS430C and AS510B put 77 lb on the pad, more than the AS5160 at 60 lb, the AS5160T at 51 lb and the Fang 15B at 44.5 lb, so if your floor carries heavy, ground-in soil, that down pressure can matter to you as much as tank size.

Which Viper scrubber fits your building?

Match the floor scrubber to your space, your tight spaces and your daily routine first, and only then check it against your budget.

Custodians who run Vipers every day tend to place them in that same range. One calls a 20 inch Viper amazing for elementary schools and smaller buildings but a little small for high schools, and another who runs twelve of them calls them a good middle of the road machine. If your floors need more than a 20 inch cleaning path, the guide to walk-behind vs ride-on floor scrubbers covers your next step up, including when a ride-on makes sense for your labor budget.

Corded or battery: AS430C vs AS510B

These two machines share most of their design, so the choice comes down to how you want to power yours. The AS430C gives you a 17 inch cleaning path, 13 gallon tanks and a 66 ft cord, while the AS510B moves up to a 20 inch path with 10.5 gallon tanks, two 105 Ah AGM batteries and a 9 amp onboard charger. Both put the same 77 lb of pad pressure on the floor, and our store lists the AS510B with either a disk brush or a pad holder.

The cord is the real decision, and most practitioners lean against it. Three of the five who weigh in on corded scrubbers warn against them, and one who took over several facilities says don't cheap out and buy a corded scrubber, while another says the cord will kill your productivity. A school custodian disagrees and recommends a 17 inch corded scrubber for a small locker room, which is exactly where the AS430C fits.

The corded side has a genuine advantage too, because you never have to buy replacement batteries, and five practitioners call batteries one of the costliest parts of any scrubber. If your floor is small and your outlets sit close together, the electric floor scrubbers stay the cheaper machines to own. If your crew moves between rooms, wings or buildings, start with the cordless floor scrubbers instead.

AS5160 vs AS5160T: is traction drive worth it?

Usually, if your routes are long. The two walk-behind scrubbers share a 20 inch cleaning path and 16 gallon tanks, but the AS5160T adds a 150 watt traction motor that moves the machine forward, so your operator only steers and operator fatigue drops on every long run. The catalog rates it at 23,680 square feet per hour against 15,748 for the AS5160, about 50% more, and it weighs 18 lb more.

Picture your school corridor in the second hour of a night shift. Your operator on a push machine leans into the handle to keep the pad moving, and each pass feels a little slower than the one before. By the far end of the wing the scrub pattern starts to wander and the overlaps get sloppy. On the AS5160T the same operator walks behind a machine that holds its own pace, finishes the wing on schedule and still has energy left for the gym.

Custodians agree on this almost without exception. Seven of the eight comparing the two drive types prefer self-propelled, from one who finds it "so dang convenient" to another whose new push machine is "such a drag", and one college crew recently upgraded some of its Vipers to self-propelled. Another custodian says a self-propelled walk-behind reduces operator fatigue, especially in a big building.

The exception is a tight, occupied building. A nursing home custodian chose a push machine because it made it easier to react to people coming around corners. If your floor is mostly short runs in tight spaces between residents, staff or shoppers, the AS5160 gives you that control and saves you the $926 price gap.

AS510B or AS5160: what do the bigger tanks buy you?

Fewer trips to the drain, which is what tank size really buys you. Both floor scrubbers scrub a 20 inch path, but the AS5160 solution tank carries 16 gallons of cleaning solution against 10.5, so on a large floor you stop to dump and refill less often. The AS510B has more down pressure, at 77 lb against 60, and ships with AGM batteries, while the AS5160 lets you choose wet, AGM or TPPL batteries and costs you $552 more with the 105 Ah wet set.

Tank size doesn't change your daily routine, though. Four custodians raise emptying and rinsing the tanks after every use, and one who tells new hires to baby the auto scrubber puts cleaning it out after each use near the top of the list. Another owner of a 20 inch disk machine says that having no floor drain makes the tank a pain to clean out, so if your building has no drain close by, you'll feel every extra gallon twice.

Is the Fang 15B big enough?

For restrooms, classrooms, tight spaces and small shops under about 5,000 square feet, yes. The Fang 15B scrubs a 15 inch path, weighs 124 lb operating, folds its handle down and lifts off its 3.5 gallon recovery tank for emptying. Its two 33 Ah AGM batteries and 5 amp onboard charger mean you never have to hunt for an outlet in the middle of a job.

You should know the limits of the smallest Viper walk-behind before you buy, though, since its maneuverability in tight spaces comes with less pad pressure. Four of the five custodians discussing micro scrubbers call them light duty auto scrubbers, and one warns that the smaller machines don't put down much pressure. No owner reports on the Fang 15B itself turned up in this research, so treat those comments as a guide to the class rather than to this model.

The Fang also costs $1,040 more than the corded AS430C, so pick it for cordless reach into small rooms rather than to save money. You'll find similar machines among the compact floor scrubbers and in the guide to the best floor scrubber for a small business.

Who makes Viper floor scrubbers?

Nilfisk makes them. Viper sits in the Nilfisk family of brands beside Advance and Clarke, and Nilfisk describes it as reliable and easy to use, delivering the best possible quality to price ratio. Every catalog and spec sheet cited in this comparison is published on nilfisk.com.

Owners describe the brand in much the same terms. Five of the seven voices on Viper's place in the market describe a solid machine for the money, while two say a premium line holds up better under heavy use. If your building needs very heavy pad pressure all day, one experienced custodian says that is hard to get from any 20 inch floor scrubber and suggests a self-propelled machine at 26 or 28 inches, and we agree.

What do owners report after the first year?

Owners of Tennant, Kärcher, Advance and Clarke machines report the same complaints, so none of this is unique to Viper. Results track daily maintenance, the cleaning solution you use and battery care, and factory defects inside the warranty get repaired. Here's what comes up most often, and what you can do about each one.

• Battery care decides battery life. Eight practitioners say so, and one AS5160 owner traced batteries that held a charge for only minutes to the machine being left unplugged too long. A former maintenance worker adds that someone unplugging the charger to use the outlet happens a lot, so make sure your machine stays on charge between shifts.
• Replacement batteries are expensive. One owner put a new set at about 30% of the machine's price, so the charging habits above pay for themselves.
• AGM or wet is a genuine split. Three practitioners prefer sealed batteries because they need less upkeep, and two prefer wet batteries for longer life, as long as you keep them topped up with distilled water. The floor scrubber batteries guide covers the tradeoff in detail.
• Water strips on tight turns. Four owners report water left past the squeegee's range while turning, which you can usually avoid by cutting the solution flow and slowing down before you turn.
• Weak solution flow is usually a clogged filter. Four owners ran into it, so check your solution filter before you suspect anything bigger.
• Vacuum cutouts usually have simple causes. One AS5160 owner found loose nuts on the battery terminals tripping the breaker, and clogs or too much down pressure account for most of the rest. The floor scrubber maintenance checklist covers both.

What does the warranty cover?

All five machines carry Nilfisk's standard US terms for walk-behind scrubbers, as set out in its current warranty sheet: 3-year parts, 3-year labor and 1-year travel, with travel capped at 3 hours round trip. Lead acid, AGM and gel batteries are covered for 12 months against manufacturer defects, TPPL batteries carry their maker's own warranty, and wear items such as scrub brushes, pad holders, filters and rubber parts are excluded. Coverage starts when the machine leaves the factory, so register yours online with proof of sale, which can move that start date by up to 1 year.

Frequently asked questions

How do you operate a Viper floor scrubber?

Fill the solution tank with water and cleaning solution, lower the disk brush or pad and the squeegee, then walk the auto scrubber forward in overlapping passes and empty the recovery tank when you finish. The guide on how to use a floor scrubber walks you through each step.

Do Viper scrubbers come with batteries?

Our AS510B and Fang 15B listings include batteries. You can buy the AS5160 and AS5160T with or without them, and the AS430C runs on its cord, so it needs none.

How long does a Viper scrubber run per charge?

Nilfisk publishes no run time for these five floor scrubbers. Your run time per charge depends on battery size, pad pressure, battery maintenance and how you charge, and you'll get a longer run time from a bigger battery set, so compare the battery options in the floor scrubber batteries guide before you choose.

Which Viper should you buy?

Buy the AS510B for most schools and offices, the self-propelled AS5160T when your routes are long, and the Fang 15B or AS430C for small spaces. The exception is a tight, busy building, where short runs and blind corners favor a push machine like the AS5160.

Not sure which fits your building? Send us your square footage, floor type and how often you clean, or call (855) 601-5678, and you'll get a model matched to your floor. Settle the spec before the box is opened, because our return policy takes back machines within 30 days of delivery only if they're unused, in new condition and in their original packaging. You can also browse all Viper floor scrubbers to compare variants.

Related reading: Walk-behind vs ride-on floor scrubber · Floor scrubber batteries · Floor scrubber maintenance · Best floor scrubber for small business

Written by Rod Michelini, founder of OneUp Cleaning. OneUp sells all five Viper scrubbers named here, so we have a stake in this answer. Specifications come from Nilfisk's Viper US catalog and product pages, checked October 25, 2026. Owner experiences are summarized from public Reddit and YouTube discussions and are not first-hand.