Floor Scrubber Specs Explained: How to Read a Spec Sheet Like a Dealer
Every line on a floor scrubber spec sheet explained, from path width and water lift to battery Ah and gradeability, plus the specs that mislead buyers.
Key takeaways
- Productivity figures on spec sheets are usually theoretical, so multiply by a practical efficiency of about 0.55 to 0.75.
- Overall width with the squeegee, not path width, decides whether a machine fits your doors and aisles.
- Battery amp-hours mean little without voltage, the discharge rate they were rated at, and the machine's power draw.
- Derived numbers such as minutes per tank and sq ft per charge are more useful than any single printed spec.
A floor scrubber spec sheet lists cleaning path, theoretical productivity, tank capacities, down pressure, brush speed, vacuum performance, battery voltage and amp-hours, speeds, gradeability, weight, dimensions, and noise. The specs that matter most for buying are path width, overall width, real productivity, runtime, and tank size, and several of them need to be adjusted before you can compare machines.
Spec sheets are written to sell, and manufacturers do not always measure the same way. This page decodes each line, flags the ones that mislead, and shows how to turn raw specs into numbers that predict how the machine will perform on your floor. For terms not covered here, see the glossary.
Spec-by-spec decoder
Cleaning and coverage
| Spec | What it means | What to check |
|---|---|---|
| Cleaning path (scrub path) | Width of floor scrubbed in one pass, in inches or mm | Compare like for like; dual-disc and cylindrical decks are measured differently |
| Squeegee width | Width of the rear squeegee, wider than the path to catch edge water | Usually the widest point; this is the real fit width |
| Theoretical productivity | Path width x maximum speed, sq ft per hour | Almost always assumes 100 percent efficiency |
| Practical productivity | Some makers apply an efficiency factor | Ask what factor; ours is 0.65 |
The Scrubber Guide model for real output is sq ft per hour = path width (in) / 12 x speed (ft/min) x 60 x efficiency. A 20 in walk-behind at 175 ft/min is about 17,500 sq ft per hour in theory, and about 11,400 at 0.65 efficiency. Run your own figures in the productivity calculator.
Scrubbing performance
| Spec | What it means | What to check |
|---|---|---|
| Down pressure (brush or pad pressure) | Force pressing the brush or pad onto the floor, often in lb or kg, sometimes as settings | Range, number of settings, and whether it is maintained as brushes wear |
| Brush or pad speed (RPM) | Rotation speed of discs or cylinders | Higher is not always better; disc vs cylindrical vs orbital RPM are not comparable |
| Brush type and diameter | Disc diameter or cylinder length and diameter | Price and availability of replacements |
| Solution flow | Gallons or liters per minute, often adjustable | Range and number of settings; lower minimum extends tank time |
Down pressure is one of the most inconsistent specs. Some makers quote the total weight on the deck, some quote only the added pressure, and some quote a per-area figure. Compare only if the method is the same, and judge it by a demo on your worst floor. See down pressure for how it interacts with pads and brushes.
Water recovery
| Spec | What it means | What to check |
|---|---|---|
| Vacuum motor power | Electrical input in watts or hp | Not a measure of suction |
| Water lift | Suction strength, in inches of water column (or kPa) | Higher means stronger lift through hoses and squeegee |
| Airflow | Volume moved, in cubic feet per minute or liters per second | Matters for wide squeegees |
| Number of vacuum stages | Multi-stage motors usually produce more lift | Also affects noise |
Water lift and airflow together determine pickup. A machine with high lift and too little airflow may struggle on a wide squeegee; one with high airflow and low lift may leave water in grout lines. If the spec sheet lists only motor watts, ask for water lift. More detail is in vacuum motors and water recovery.
Tanks
| Spec | What it means | What to check |
|---|---|---|
| Solution tank | Clean water and chemical, gallons or liters | Combine with flow rate to get minutes per tank |
| Recovery tank | Dirty water, gallons or liters | Should be at least equal to solution tank; slightly larger helps reduce foam and overflow |
| Tank access | Lid size, drain hose, cleanout port | Wide openings get rinsed; narrow ones breed odor |
Typical ranges: micro 1 to 3 gal, walk-behind 8 to 30 gal, ride-on 25 to 60 gal, industrial 60 to 100+ gal. See tanks and solution flow.
Power and runtime
| Spec | What it means | What to check |
|---|---|---|
| Battery voltage | 12, 24, 36 V and higher | Higher voltage usually means larger machines and more power |
| Battery capacity (Ah) | Amp-hours, at a stated discharge rate | Ask for the rate (often 20-hour, which overstates capacity at scrubber loads) |
| Battery type | Flooded, AGM, gel, or lithium | Affects runtime, maintenance, charging |
| Runtime | Hours per charge | Ask under what conditions |
| Charger | Onboard or offboard, output, algorithm | Must match battery chemistry |
Amp-hours alone do not tell you runtime. Energy is voltage times amp-hours: a 24 V, 200 Ah pack holds about 4,800 Wh nominally. Lead-acid batteries deliver less than their rated capacity at the high current a scrubber draws, and should not be drained fully if you want them to last. Lithium (LiFePO4) delivers closer to its rating and tolerates deeper discharge.
Mobility and dimensions
| Spec | What it means | What to check |
|---|---|---|
| Drive type | Brush-assist or traction (pad-assist on some) | Traction for large areas and ramps |
| Speed | Max forward and reverse, mph or ft/min | Scrubbing speed is often lower than transport speed |
| Gradeability | Steepest slope, usually in percent | Scrubbing vs transport rating; loaded vs empty |
| Turning radius or aisle turn | Space needed to turn around | Ask for a 180 degree aisle turn width |
| Overall length, width, height | Physical size | Width with squeegee; height for elevators and storage |
| Weight | Empty and with full tanks and batteries | Floor loading, elevators, trailers |
| Sound level | dB(A), measured at operator ear | Matters for daytime cleaning in healthcare, schools, retail |
Derived specs: the numbers that actually predict performance
These calculations combine printed specs into numbers you can compare. They are Scrubber Guide working formulas, not manufacturer ratings.
Minutes per tank
Minutes per tank = solution tank (gal) / flow rate (gal per min) Example: 20 gal at 0.5 gal per min = 40 minutes. At a lower 0.3 setting = about 67 minutes.
Square feet per tank
Sq ft per tank = practical sq ft per hour x minutes per tank / 60 Example: a 28 in walk-behind at about 15,900 sq ft per hour with a 40 minute tank cleans about 10,600 sq ft per fill.
Estimated runtime from battery specs
Runtime (hrs) = usable watt-hours / average power draw (W) Example with stated assumptions: 24 V x 200 Ah = 4,800 Wh nominal. Assume about 60 percent usable for lead-acid at scrubber discharge rates, giving about 2,900 Wh. With brush, vacuum, and traction drawing about 1,000 W on average, runtime is about 2.9 hours. Swap your machine's numbers into the battery runtime calculator.
Square feet per charge
Sq ft per charge = practical sq ft per hour x runtime Example: 15,900 x 2.9 = about 46,000 sq ft. If your nightly area is larger, you need a bigger pack, lithium with opportunity charging, or a wider machine.
Fit check
Clearance = narrowest door or aisle minus overall width with squeegee. Aim for at least 4 to 6 in of clearance on each side of a door for daily use by tired operators. Less than that, and doorframes and the squeegee will take damage.
Specs that commonly mislead
- Theoretical productivity. It assumes no turns, no overlap, and no refills. Apply 0.55 to 0.75.
- Runtime "up to" figures. Usually measured at the lightest settings. Ask for runtime at medium pressure with a brush.
- Path width on cylindrical decks. Measured differently from discs; compare with a demo.
- Down pressure. No common method. Use it only within one manufacturer's lineup.
- Gradeability. Transport gradeability is higher than scrubbing gradeability. A machine may climb a ramp but not scrub on it safely.
- Tank capacity. Some quote total tank volume rather than usable fill. Ask.
- Weight. Often listed empty. Full tanks add about 8.3 lb per gallon of water, so 20 gal of solution adds about 166 lb.
A spec comparison worksheet
When comparing finalists, line them up like this. Fill the derived rows yourself.
| Line | Machine A | Machine B | Machine C |
|---|---|---|---|
| Path width (in) | |||
| Overall width with squeegee (in) | |||
| Scrub speed (ft/min) | |||
| Practical sq ft per hour (at 0.65) | |||
| Solution tank (gal) and flow range | |||
| Minutes per tank at medium flow | |||
| Battery type, V, Ah, and rating rate | |||
| Runtime at medium pressure (hrs) | |||
| Sq ft per charge | |||
| Aisle turn width | |||
| Scrubbing gradeability | |||
| Sound level dB(A) |
Then bring the gaps to the dealer using questions to ask a dealer, and fold the results into the selection rubric in how to choose a floor scrubber. For how all these components work together, see how an auto scrubber works.
Frequently asked questions
What is the most important floor scrubber spec?
Path width matched to your area and time is the starting point, but overall width with the squeegee and real runtime are the specs that most often make or break a purchase. A machine that cannot fit through your doors or finish the shift on one charge fails regardless of other specs.
What does water lift mean on a floor scrubber?
Water lift is the vacuum motor's suction strength, measured as how many inches a column of water can be lifted. Higher water lift generally means better pickup through hoses and the squeegee, especially on textured floors and grout.
How accurate are floor scrubber productivity ratings?
Most published ratings are theoretical, multiplying path width by top speed with no allowance for turns, overlap, or refills. Practical output is typically 55 to 75 percent of that figure.
How do I compare battery runtimes between scrubbers?
Ask each manufacturer for runtime at the same down pressure and brush type, and convert battery specs to watt-hours (voltage times amp-hours) noting the discharge rate used. Lithium packs usually deliver closer to their rated capacity than lead-acid.
What does gradeability mean?
Gradeability is the steepest slope the machine can handle, usually shown as a percentage. Many machines have a lower rating for scrubbing than for transport, so check the scrubbing figure if you clean ramps.