Why diameter alone isn't the answer
Ask a room full of contractors which surface cleaner to buy and somebody will say "go as big as your machine can handle." It sounds logical. A 36-inch deck covers more ground per pass than a 24-inch deck, so it should finish first. Sometimes it does. Plenty of times it doesn't.
The width printed on the box is only one input. How fast the cleaner actually gets a driveway done depends on how much water your pressure washer really delivers, how the spray bar and nozzles are set up, the layout of the job, how fast you can walk while still leaving a clean, even finish, and how much time you lose turning, edging, lifting over curbs, and loading. A deck that's too big for your flow, or too awkward for the site, can force you to slow down or go back over your work — and that erases the width advantage.
This guide compares seven cleaners Republic Pressure Cleaning Equipment carries in San Antonio: five from Whisper Wash and two BE Whirl-A-Way 20-inch models. It's built from manufacturer specifications, published contractor discussions, and working-contractor perspective. It is not a controlled, timed test of all seven machines, and nothing here should be read as a measured production rate. The goal is simpler: help you match the machine to your pressure washer, your typical jobs, how you like a cleaner to handle, and where you'll store it.
The short version: the biggest cleaner doesn't automatically finish the job fastest. Match the machine, nozzle configuration, job layout, walking speed, handling, and finished result.
Quick-pick table
Use this as a starting shortlist, not a final answer. These are editorial suggestions based on published specs — not manufacturer recommendations.
| If you need… | Worth considering | Why |
|---|---|---|
| An all-around residential and light commercial cleaner | Ground Force 24, Big Guy 28 | Moderate widths, 5–12 GPM published range, hot-water rated |
| A lower-flow machine (around 4–5 GPM) | BE 20-inch Floater or Caster | Only models here with a published range starting at 4 GPM |
| Compact storage in a van or small trailer | Ground Force 24 | 23 lb published operating weight and a Flip-N-Fold handle |
| Longer driveway and commercial concrete runs | Big Guy 28, Mini Mondo 31 | More width with steering or dual-bar designs aimed at production |
| Big open lots on a high-flow rig | Maxima 36, Mondo Force 49 | Widest paths here; Mondo Force starts at 8 GPM |
| A caster-free hovering feel | BE 20-inch Floater | Rides on hovering action without casters |
Specification comparison
Published figures from each manufacturer's product pages and linked specification sheets. Weights are published operating weights for Whisper Wash and linked specification-sheet unit weights for BE.
| Model | Width | GPM | PSI | Max temp | Weight | Wheels / casters | Handle |
|---|---|---|---|---|---|---|---|
| Whisper Wash Ground Force 24 (GF2400) | 24 in | 5–12 | 2,000–4,000 | 212°F | 23 lb | Four 3-in pivoting casters | Flip-N-Fold |
| Whisper Wash Big Guy 28 (BG2800) | 28 in | 5–12 | 2,000–4,000 | 212°F | 38 lb | One 4-in front caster, two fixed 8-in no-flat rear wheels | Fixed |
| Whisper Wash Mini Mondo 31 (MM400) | 31 in path (31 × 16 in cover) | 6–12 standard | 2,000–4,000 | 212°F | 33 lb | Four 3-in pivoting casters | Break-apart |
| Whisper Wash Maxima 36 (MAX3600) | 36 in | 6–12 | 2,000–4,000 | 212°F | 37 lb | Four 3-in pivoting casters | Break-apart |
| Whisper Wash Mondo Force 49 (M500) | 49 in path (49 × 25 in cover) | 8–12 standard | 2,000–4,000 | 212°F | 52 lb | Four 3-in pivoting casters | Break-apart |
| BE Whirl-A-Way 20" Floater (85.403.007) | 20 in | 4–8 | See note | 180°F | 24 lb (spec sheet unit) | None — hovering action | Twin handles |
| BE Whirl-A-Way 20" with Casters (85.403.011) | 20 in | 4–8 | See note | 180°F | 28 lb (spec sheet unit) | Four swivel casters | Twin handles |
Whisper Wash sources: Ground Force 24 (opens in a new tab) Big Guy 28 (opens in a new tab) Mini Mondo 31 (opens in a new tab) Maxima 36 (opens in a new tab) Mondo Force 49 (opens in a new tab) Resources (opens in a new tab)
One more distinction: nominal cleaning width, fully assembled dimensions, and shipping-box dimensions are three different numbers. A "24-inch" cleaner's deck and handle take up more than 24 inches, and the box is bigger still. Measure your storage space against the assembled unit, not the model name.
GPM, pressure, temperature, and nozzles: "it runs" vs. "it cleans efficiently"
Flow (GPM) does the heavy lifting
Flow is what moves dirt and what feeds a wide deck. A common contractor rule of thumb is roughly four inches of cleaning width per GPM — about 24 inches on a 6 GPM machine, about 32 inches at 8 GPM. That's a shop-talk sizing guide, not a manufacturer limit and not a performance guarantee. Surface, soil, water temperature, nozzle setup, and walking pace all move the answer.
Keep manufacturer operating ranges separate from editorial recommendations. When Whisper Wash lists the Maxima 36 at 6–12 GPM, that's the range the cleaner is designed to operate within. It doesn't establish that 6 GPM will give you an ideal cleaning pace on a 36-inch deck. Meeting a minimum flow rating means the cleaner can run; it doesn't guarantee it cleans efficiently.
Pressure: rated maximum isn't the right setting for every surface
The 4,000 PSI figure on a Whisper Wash spec sheet is an upper operating limit, not a recommended setting. Different concrete, pavers, and coatings call for different approaches, and there's no universal "concrete pressure" we can hand you. Follow the surface and coating manufacturer's guidance and test in an inconspicuous area.
Nozzles divide flow, not pressure
This is one of the most repeated mistakes in the trade: "four nozzles means 4,000 PSI becomes 1,000 PSI per nozzle." That's not how it works. Multiple nozzles divide the available flow among the outlets; they don't divide the pressure. The system pressure is set by how much flow is being pushed through the combined orifice area. Pump manufacturer Cat Pumps covers the relationship between nozzles, flow, and pressure in its FAQ. Cat Pumps FAQ (opens in a new tab)
That's why nozzle sizing has to match your actual flow, your target pressure, the spray-bar configuration (two-tip vs. four-tip), and the cleaner manufacturer's guidance. We're deliberately not printing universal nozzle sizes here — the right tips depend on your machine. Whisper Wash publishes nozzle and setup material on its resources page. Whisper Wash resources (opens in a new tab)
Temperature and the weakest link
A surface cleaner's temperature rating is only one piece of the system. Your hose, swivels, quick-connects, gun, and reel each have their own pressure and temperature ratings. Observe the lowest applicable temperature and pressure limit anywhere in the complete system.
An illustrative calculation (not a tested production rate)
The point: more width only pays when you keep the pace. If the wider deck needs you to slow down or make repeat passes, its advantage disappears.
The seven cleaners, one by one
Each section links to our full product page. Add anything you're considering to your quote list and we'll get back to you with pricing and availability.
Whisper Wash Ground Force 24
- Width: 24-inch cover
- Flow: 5–12 GPM
- Pressure: 2,000–4,000 PSI
- Water: Hot or cold, max 212°F
- Operating weight: 23 lb (published)
- Wheels: Four 3-inch pivoting casters
- Handle: Flip-N-Fold
The Ground Force 24 is the balance point of the lineup. At 24 inches it's wide enough for real driveway production on a mid-size machine, yet it's the lightest Whisper Wash here at a published 23 lb operating weight. Four pivoting casters let it roll in any direction, which helps around posts, parked cars, and tight walkways.
The Flip-N-Fold handle is a storage win — but remember that folding the handle doesn't shrink the deck. You still need room for a 24-inch cover. For vans, small trailers, and crowded rigs, that combination of weight and a folding handle is a big part of the appeal.
Bill Eary, a working pressure-cleaning contractor, considers the Ground Force 24 one of the best all-around surface cleaners available.
Whisper Wash Big Guy 28
- Width: 28-inch cleaning width
- Flow: 5–12 GPM
- Pressure: 2,000–4,000 PSI
- Water: Hot or cold, max 212°F
- Operating weight: 38 lb (published)
- Wheels: One 4-in front caster, two fixed 8-in no-flat rear wheels
- Handle: Fixed
The Big Guy 28 steps up four inches and changes how the cleaner moves. Instead of four pivoting casters, it has one 4-inch front caster and two fixed 8-inch no-flat rear wheels. That layout steers more like a push mower: it tracks straight on long runs and the big rear wheels roll over expansion joints and rough spots easily, but you pivot it rather than slide it sideways.
It's heavier (38 lb published) and has a fixed handle, so plan storage around its full assembled size. Some contractors find the extra weight settles the deck and the big wheels make it easier to move between spots; others prefer the lighter Ground Force for lifting and loading. Lighter to lift isn't automatically easier to steer — and vice versa.
Bill Eary counts the Big Guy 28 as another personal favorite.
Note: some Whisper Wash introductory copy for this model contains an inconsistent 24-inch reference. The model designation, features, and coverage specifications identify it as a 28-inch cleaner.
Whisper Wash Mini Mondo 31
- Path: 31 in (31 × 16 in cover)
- Flow: 6–12 GPM standard
- Pressure: 2,000–4,000 PSI
- Water: Max 212°F
- Operating weight: 33 lb (published)
- Wheels: Four 3-inch pivoting casters
- Design: Dual swivels, dual spray bars
- Handle: Break-apart
The Mini Mondo isn't round. Its 31 × 16-inch cover uses two swivels and two spray bars side by side, cleaning a 31-inch path with a much shorter front-to-back depth than a round 31-inch deck would have. That shape can make it easier to get along walls and into rectangular spaces while still covering serious width.
Two spray bars means more nozzles to set up correctly, which matters: streaking on dual-bar cleaners is often a setup question before it's a design question. The standard range is 6–12 GPM. Whisper Wash also mentions modified configurations up to 20 GPM — that's a special configuration, not the standard unit, and we don't recommend do-it-yourself modifications.
Whisper Wash Maxima 36
- Width: 36-inch circular cover
- Flow: 6–12 GPM
- Pressure: 2,000–4,000 PSI
- Water: Max 212°F
- Operating weight: 37 lb (published)
- Wheels: Four 3-inch pivoting casters
- Handle: Break-apart
The Maxima 36 is the widest round deck here. On a high-flow machine and wide-open concrete, 36 inches covers a lot of ground per pass. Its published operating weight (37 lb) is close to the Big Guy's, and the break-apart handle helps with transport.
The key caution: the published 6 GPM minimum tells you the Maxima will run at 6 GPM. It does not establish that 6 GPM gives an ideal cleaning pace across a 36-inch path. By the four-inches-per-GPM rule of thumb, a 36-inch deck points toward roughly 9 GPM. If you're on a lower-flow machine, expect to test pace carefully before assuming the wider deck is faster.
Whisper Wash Mondo Force 49
- Path: 49 in (49 × 25 in cover)
- Flow: 8–12 GPM standard
- Pressure: 2,000–4,000 PSI
- Water: Max 212°F
- Operating weight: 52 lb (published)
- Wheels: Four 3-inch pivoting casters
- Design: Dual swivels, dual spray bars
- Handle: Break-apart
The Mondo Force 49 is built for extensive open areas: parking lots, big commercial pads, and long runs where you can keep walking straight. Its 49 × 25-inch dual-bar cover gives the widest path in this lineup, and its 8 GPM standard minimum is the highest here.
The tradeoffs are real. At 52 lb published operating weight it's a two-hands (or two-person) lift into a truck. It needs room to turn, it's less at home on small patios and narrow walkways, and it takes up more storage. Like the Mini Mondo, the manufacturer mentions modified configurations up to 20 GPM; that isn't the standard configuration.
BE Whirl-A-Way 20-inch Floater (No Casters)
- Width: 20 inches
- Flow: 4–8 GPM
- Pressure: Confirm with Republic (see note above)
- Max temp: 180°F
- Unit weight: 24 lb (linked spec sheet)
- Housing: ABS polymer
- Movement: Hovering action, no casters
The BE Floater uses hovering action instead of casters, so it glides with no wheels to catch on cracks or leave marks. Its 4–8 GPM published range is the lowest starting point in this guide, which makes it one of the few options here that fits a smaller pressure washer.
With an ABS polymer housing and 180°F maximum temperature, it's lower-rated for heat than the Whisper Wash models. If you run hot water, check your burner output against that limit.
BE Whirl-A-Way 20-inch with Casters
- Width: 20 inches
- Flow: 4–8 GPM
- Pressure: Confirm with Republic (see note above)
- Max temp: 180°F
- Unit weight: 28 lb (linked spec sheet)
- Housing: ABS polymer
- Movement: Four swivel casters
Same 20-inch width, 4–8 GPM range, 180°F limit, and ABS housing as the Floater, but riding on four swivel casters. Casters give you a fixed deck height and rolling control, which some operators prefer for consistent distance from the surface and for moving the cleaner when not spraying.
Head-to-head comparisons
Ground Force 24 vs. Big Guy 28
Same published 5–12 GPM range, same pressure range, same 212°F maximum. The differences are width (24 vs. 28 inches), weight (23 vs. 38 lb), and handling. The Ground Force's four pivoting casters let it move freely in any direction; the Big Guy's front caster and fixed rear wheels track straighter and roll over rough ground. The Ground Force folds its handle; the Big Guy's is fixed. If your work is mostly residential with tight access and you haul in a van, the Ground Force usually fits better. If you do more long driveways and commercial runs, the Big Guy's extra width and straight tracking can pay off — as long as your flow keeps the pace up.
Big Guy 28 vs. Mini Mondo 31
Three more inches of path, but a completely different design. The Big Guy is a single round deck on big wheels; the Mini Mondo is a rectangular dual-bar deck on four pivoting casters with a break-apart handle. The Mini Mondo's 6 GPM standard minimum is a bit higher, and its dual bars add nozzle setup to get right. Its published operating weight (33 lb) is lighter than the Big Guy's 38 lb.
Mini Mondo 31 vs. Maxima 36
Both list 6–12 GPM. The Maxima gives you five more inches of width in a round deck; the Mini Mondo is shallower front to back with dual bars. On a 6–8 GPM machine, the Mini Mondo's narrower path is closer to the four-inches-per-GPM rule of thumb. On 10–12 GPM, the Maxima's width becomes easier to feed.
Maxima 36 vs. Mondo Force 49
These are the open-area machines. The Mondo Force adds 13 inches of path, needs at least 8 GPM as standard, and weighs 52 lb versus 37 lb. For huge parking lots on a high-flow rig, the Mondo Force covers the most ground per pass. For mixed jobs where you're also doing sidewalks, drive-thrus, and tighter pads, the Maxima is easier to lift, load, and turn.
BE 20-inch Floater vs. BE 20-inch with Casters
It comes down to feel. The Floater hovers with no casters; the Caster model rolls on four swivel casters and is a little heavier on the linked spec sheets (28 lb vs. 24 lb unit weight). Everything else published — width, flow, temperature, housing — matches. Confirm the pressure rating of either unit with us before buying.
What contractors report
These are brief paraphrases of self-reported experiences in public forums. They're individual opinions — not independently verified tests, not Republic customer reviews, and not a consensus.
- Ground Force (November 2019): A user posting as "Coolunderpressure" said they preferred the Ground Force after trying a larger cleaner, mentioning storage and how easily it rolled when not spraying. Forum thread (opens in a new tab)
- Big Guy on 6 GPM (July 2024): In a Reddit thread about 6 GPM machines, one commenter recommended the Big Guy. Another said their four-nozzle Big Guy ran too slowly at 6 GPM and performed much better at 8 GPM. Another questioned the nozzle sizing. That disagreement is the whole point of this guide: the same cleaner can feel very different depending on flow and setup. Reddit thread (opens in a new tab)
- BE 20-inch (November 2021): A commenter reported more than 200 hours on a 20-inch BE Whirl-A-Way running on a 5.5 GPM machine, including a bearing replacement and damage after hitting a rock. They didn't specify whether it was the floater or caster version. Reddit thread (opens in a new tab)
- Mini Mondo (2020–2021): A user posting as "FatFIRE" reported a center streak after changing tips, and later reported improvement after another tip change. Before judging a whole cleaner, investigate nozzle setup. Thread, page 1 (opens in a new tab) Page 2 (opens in a new tab)
- Maxima and Mondo (February 2019): "Coolunderpressure" reported needing a slower pace or repeat passes with two-nozzle Maxima units. "Racer" discussed the full-size Mondo's carrying and small-area limitations. Forum thread (opens in a new tab)
Hot-water compatibility
All five Whisper Wash cleaners in this guide list hot or cold water with a 212°F maximum. Both BE 20-inch models list a 180°F maximum. If you run a hot-water machine, that difference matters — and so does everything else between the burner and the deck. Hose, swivels, couplers, gun, and reel all carry their own ratings. The lowest temperature and pressure rating anywhere in the system is your real limit.
Heat changes how fast soils release, so a hot-water setup can shift the pace you're comfortable walking. Re-check your finish when you change temperature, not just when you change cleaners. Browse our hot-water pressure washers if you're pairing a cleaner with a new machine.
Handling, lifting, storage, slopes, edges, gates, and transport
- Lifting vs. steering. Published weights range from 23 lb (Ground Force) to 52 lb (Mondo Force). A lighter cleaner is easier to lift into a truck, but that doesn't automatically make it easier to steer on the job.
- Caster layout. Four pivoting casters (Ground Force, Mini Mondo, Maxima, Mondo Force) move freely in any direction. The Big Guy's front caster and fixed rear wheels track straighter. The BE Floater hovers with no casters.
- Slopes. On sloped driveways, heavier decks and free-pivoting casters can drift. Test how each cleaner holds a line on the grades you actually work.
- Edges and corners. Round decks leave corner areas to detail. The dual-bar Mini Mondo and Mondo Force use rectangular covers, which change how they meet walls.
- Gates and tight access. Measure the assembled width of the cleaner, not just its cleaning path, against the narrowest gate you regularly pass through.
- Storage. Flip-N-Fold and break-apart handles save space, but the deck stays the same size. Measure your trailer or van against the cover dimensions.
- Transport. Consider who's loading it. A 52 lb deck handled several times a day adds up.
Checklist: comparing cleaners on an actual job
If you get the chance to try more than one cleaner, compare them fairly:
- Confirm your pressure washer's real flow, pressure, and whether you're running hot or cold.
- Confirm each cleaner's nozzles are sized for that flow and target pressure per manufacturer guidance.
- Use the same surface, soil level, chemistry, and water temperature for each cleaner.
- Walk the pace that gives a clean, even finish with no streaks or swirl marks — then note that pace.
- Count repeat passes and touch-ups.
- Time the whole area including turns, edges, and moving obstacles — not just straight runs.
- Note lifting, loading, and how the handle breaks down for your rig.
- Check the finished result in daylight after it dries.
Frequently asked questions
What size surface cleaner should I buy for a 4 GPM pressure washer?
Of these seven, only the BE 20-inch models list a range that starts at 4 GPM (4–8 GPM). Every Whisper Wash model here starts at 5 GPM or higher. Confirm the exact rating of the unit supplied and your machine's real output before buying.
Is a bigger surface cleaner always faster?
No. Wider coverage only helps if you can keep a similar walking pace, clean in one pass, and turn and edge efficiently. If a wider deck forces you to slow down or repeat passes, a smaller cleaner can finish first.
Does a four-nozzle spray bar split 4,000 PSI into 1,000 PSI per nozzle?
No. Multiple nozzles divide the available flow among outlets. Pressure depends on the flow and the combined orifice size. Nozzles should be sized to your flow, your target pressure, the spray-bar configuration, and manufacturer guidance.
Can I run these surface cleaners with hot water?
The five Whisper Wash models list a 212°F maximum. The BE 20-inch models list 180°F. Your whole system — hose, swivel, fittings, gun, and any reel — must be rated for the temperature and pressure you run, and the lowest rating in the system is your limit.
What's the difference between the BE 20-inch Floater and the Caster version?
Both are 20-inch, 4–8 GPM, 180°F units with ABS polymer housings. The Floater (85.403.007) rides on its hovering action with no casters; the Caster version (85.403.011) rolls on four swivel casters.
Does Republic have these in stock in San Antonio?
Contact us for availability. Call 210-437-0111 or add models to your quote list and send a request, and we'll confirm availability and pricing for the exact unit.
Want to see all of them side by side? Browse our full flat surface cleaners lineup.
Get pricing and availability in San Antonio
Compare the models above, add the ones you're considering to your quote list, and send us a request. Tell us your pressure washer model, GPM, PSI, hot or cold setup, and the jobs you normally do — we'll help you match the right cleaner. Contact for availability.