NaceCare TGB 516NX 16" Compact Battery Scrubber (Numatic 1840, TTB1840NX)

Most auto scrubbers are built for wide-open spaces. The NaceCare TGB 516NX Compact Floor Scrubber is built for everywhere else. With a 16 in (406 mm) cleaning path and a machine that measures just 20.5 in (520 mm) wide, this battery powered walk behind floor scrubber compact enough to fit through a standard restroom doorway still delivers the one-pass scrub-and-dry performance of a full-size machine. No buckets. No wet floors waiting to be re-soiled. Just clean, dry results in spaces that used to be off-limits for auto scrubbers.

Looking for the Numatic 1840? You found it. Numatic builds this machine in England and sells it in the UK and Europe as the Twintec TTB1840NX (older units were labeled TTB1840). NaceCare brings the same machine to the US as the TGB 516NX: the same 16 inch scrub head, the same 5 gallon (18 L) tank, the same NX300 battery and the same 850 x 520 x 1,132 mm frame. Buying the US model gets you a charger made for US outlets, NaceCare's US warranty and parts support on this side of the Atlantic. So if your spec sheet, your old machine or your purchasing manager says 1840, this is the one to order.

The TGB 516NX runs on NaceCare's 36V NX300 Lithium-Ion battery, which delivers up to 80 minutes of runtime on a full charge, or 60 minutes at the 80% charge point if you're working on a tighter schedule. That's enough to cover 17,600 sq ft (1,635 m²) per hour across restrooms, classrooms, restaurant prep areas, retail stockrooms, or any corridor that's been giving your cleaning crew headaches. When the job is done, the machine weighs in at 75 lbs (34 kg) dry with battery, light enough to load into a car trunk, which makes it a favorite among mobile cleaning contractors who move between locations daily.

The TGB 516NX comes with your choice of cleaning head: a pad driver (SKU K-919657) for smooth hard floors, or a NyloScrub disk brush (SKU K-919656) for textured or lightly uneven surfaces. Same machine, same specs, same 16 inch battery floor scrubber performance. You're just picking the right tool for your floor type. Either way, you get a real auto scrubber in a package that actually fits your building.

One battery or two? Every TGB 516NX ships with one NX300 battery and the NX300 fast charger. The two-battery package adds a second NX300 for $580 more, so you can swap packs mid-shift and keep scrubbing while the spare charges. Two full packs give you up to 160 minutes of scrubbing instead of 80. If your crew cleans in one short run per shift, one battery is plenty. If the machine runs back to back, or moves between several buildings in a day, go with two.

• 16 in (406 mm) cleaning path in a 20.5 in (520 mm) wide frame, fits through restroom doors and tight corridors where standard scrubbers can't follow.

• 36V NX300 Lithium-Ion battery delivers up to 80 minutes of runtime at full charge, or 60 minutes at 80% charge. Rated for 2,500+ charge cycles for long service life.

• Fast charge times: 1 hour to 80%, 2 hours to 100%, so the machine is ready again before your next shift starts.

• 175 W brush motor at 175 RPM with approximately 60 lbs (27.2 kg) of down pressure for thorough scrubbing on the first pass.

• 100 W vacuum motor recovers solution immediately behind the brush, leaving floors clean and dry in a single pass. No waiting, no wet floor signs.

• 5 gal (18 L) solution tank for extended cleaning runs without constant refills.

• Covers up to 17,600 sq ft (1,635 m²) per hour, roughly 30% faster than mopping the same area, and without the re-soiling problem that mops leave behind.

• Quiet operation at 65 dB(A), comfortable to run in occupied spaces like hotel lobbies, school hallways, and retail environments.

• IPX4 weather resistance rating, so the machine is protected against water splashes, which is exactly what you want in a machine that works with water all day.

• Adjustable handle height with fold-down storage position fits operators of different heights, and folds flat for van or trunk transport.

• Nu-Assist App support (iOS and Android) provides multilingual operator training and maintenance guidance, useful for teams with varied language backgrounds.

• NX300 battery is interchangeable across NaceCare's cordless machine lineup. If you run more than one NX-series machine, one spare battery covers your whole fleet. A spare NX300 Lithium-Ion Battery lets you hot-swap and keep cleaning without waiting for a recharge, or pick the two-battery package above and get the spare in the box.

• Replacement parts for the TGB 516NX are available through OneUp. Search the NaceCare TGB 516NX parts catalog or contact us and we'll track down what you need.

• Need something even smaller? The NaceCare NUC 440NX ultra-compact scrubber (formerly the 244NX) runs on the same NX300 battery, so both machines can share your spares.

• Need more tank and runtime? The NaceCare TGB 817NX walk-behind scrubber steps up to a 17-inch path, 8-gallon tanks and two of the same NX300 batteries, for open floors where the 516NX would need a refill halfway through.

The TGB 516NX uses a disk rotary cleaning system: the brush or pad driver spins against the floor, loosening soil and working the cleaning solution into the surface. Immediately behind that action, the vacuum motor recovers the dirty water, so the floor goes from dirty to scrubbed and dry in a single forward pass. A mop pushes dirty water around and leaves the floor wet for minutes, which means soil resettles as it dries. The TGB 516NX pulls the dirty water up and out, so what you're left with is actually clean. People commonly ask how long a NaceCare battery lasts. With the NX300 at full charge you get 80 minutes of continuous operation, long enough to cover most facility-size cleaning runs in one go. If your operation needs more, a second NX300 Lithium-Ion Battery lets you hot-swap mid-job with zero downtime. The NX300 Fast Charger is also worth having on hand if you're charging a spare while the machine runs.

As for what floors the TGB 516NX handles: VCT, ceramic tile, hardwood, concrete, LVT, marble, rubber, vinyl, linoleum, epoxy, terrazzo, quarry tile, and porcelain tile are all fair game. The pad driver configuration is the right call for smooth hard floors; the NyloScrub brush configuration handles textured and lightly uneven surfaces better. Download the NaceCare TGB 516NX manual for detailed dilution ratios, maintenance schedules, and troubleshooting guidance.

The TGB 516NX was designed for environments that fall between "a mop will do" and "we need a full-size scrubber," and that gap covers a lot of real-world facilities. Hospitals and clinics where infection control matters. Hotel corridors and restrooms where cleanliness is on display around the clock. Restaurant kitchens and prep areas that need a machine nimble enough to work around equipment. School hallways where a quiet machine is a requirement during the day. Retail stockrooms, airport gates, mall service corridors: any space where a large machine is physically impossible and a mop isn't good enough. The SKU K-919657 pad driver variant is the one most commonly spec'd for smooth commercial hard floors in these settings.

Mobile cleaning contractors have taken to this machine for a different reason: it fits in a vehicle. At 75 lbs (34 kg) dry with battery and with a handle that folds flat, the TGB 516NX loads into a van cargo area or car trunk without drama, something no standard walk-behind scrubber can claim. Operators who've made the switch from mop-and-bucket setups consistently note the time savings and the quality difference in the finished result. If you want to see what other operators think, check back as NaceCare TGB 516NX reviews come in. We'll be collecting them right here on this page.