Vacuum, Floor Washer or Carpet Cleaner: Which Machine Do You Need?

Who it's for: every home, on every floor. Dry vacuuming is the everyday routine, and it's the safe one on unsealed or water-sensitive wood, where makers of wet machines rule their products out.

Typical messes: dust, crumbs, pet hair, sand and grit tracked in from outside, dust bunnies under the bed and the sofa.

Machine types:

• Cordless stick vacuums for quick daily pickups, stairs and the car; many convert to a handheld.
• Robot vacuums that run on a schedule; with a self-emptying dock, you empty the dustbin far less often. Measure the clearance under your furniture first (question 3 below).

Who it's for: homes with sealed hard floors such as tile, vinyl, laminate and sealed hardwood, especially kitchens, entryways and homes with kids or pets. Not for carpet, and not for unsealed or water-sensitive wood.

Typical messes: sticky juice and soda spills, dried-on food under the table, muddy paw prints, grime that a vacuum can't lift.

Machine types:

• Wet-dry vacuums (floor washers) that vacuum and wash in one pass, with a clean-water tank and a separate dirty-water tank.
• Robot vacuum and mop combos that keep sealed floors fresh between deeper cleans.
• Steam mops that clean sealed floors with steam; Shark, for one, rules them out on unsealed wood and unglazed ceramic floors.

Who it's for: homes with wall-to-wall carpet, area rugs, carpeted stairs or a fabric couch, and anyone with pets or small kids. It's also the path for car seats and floor mats.

Typical messes: pet accidents (urine, vomit), spills that soaked into the fibers, lingering odors, dingy traffic lanes on carpet.

Machine types:

• Portable carpet and upholstery cleaners (spot cleaners) with a hose and a hand tool for the couch, stairs, rugs, pet beds and car interiors.
• Full-size carpet cleaners (upright deep cleaners) for whole rooms and high-traffic areas.

Both spray water and formula into the fibers, then pull the dirty water back into a separate tank. Check the care instructions for your carpet or fabric first: some carpet cleaners are not suitable for wool.

Slide a tape measure under the furniture and note the gap from the floor to the lowest point of the frame, in inches. Measure in a few spots, since a center rail or crossbar can sit lower than the front edge.

Then compare that gap with the robot's full height, laser turret included. On the current US spec sheets we checked, robots with a fixed laser turret on top stand 3.94 to 4.09 in (100 to 104 mm) tall, and slim models with the laser sensor built into the body 3.14 to 3.23 in (79.8 to 82 mm). Some models lower a retractable turret to slip under furniture: Roborock lists the Saros 10 at 3.14 in (79.8 mm) with it lowered and 3.68 in (93.5 mm) with it raised.

In our robot guides, each height stays exactly as the manufacturer lists it, in millimeters, so every model is compared on the same figure. You can enter your clearance in inches: we convert it to millimeters before comparing.

They look alike, with two tanks, a brush and a trigger, but they do different jobs.

• Different surfaces. A carpet cleaner is built for fibers: carpet, rugs and upholstery. A hard-floor washer is built for sealed surfaces; Tineco, for example, says its Floor One washers are for non-carpeted floors such as vinyl, tile and sealed wood.
• Different depth. A carpet cleaner pushes water and formula deep into the fibers and pulls it back out. A floor washer spreads a thin layer of water and solution with a spinning brush roll and picks the dirty water straight back up from the surface.
• Different specs that matter. For a carpet cleaner: suction through the hose, the hand tools, tank size and how wet the fibers stay. For a floor washer: the brush roll, the self-cleaning cycle, edge cleaning, weight and battery runtime.
• Little real overlap. BISSELL rates its CrossWave for area rugs too, but the word its user guide uses for rugs is “refresh,” not deep clean.

So each machine is ranked only against its own kind, in its own guide. A single score across both would reward the wrong strengths.