Water tank

Large one-litre clean and dirty water tanks clip in and out with a reassuring click, reducing refill trips so users can tackle bigger or whole-house cleaning jobs more easily.

Class-leading tank capacity clearly wins in side-by-side tests, minimizing refills on whole-home or commercial-size jobs.

The 880 milliliter clean water tank is larger than many rivals, so owners report fewer interruptions to refill during routine cleaning.

Reviews consistently mention separate clean/dirty water tanks plus onboard water handling that keeps pads wet. Tank refills/empties are a routine task, but capacity and adjustable water use are generally seen as practical for whole-home runs.

Large clean and dirty water tanks in the dock (often described around 4–4.5L) enable long stretches of mopping with fewer refills and less daily attention. Removable tanks with handles are generally seen as convenient.

The dock typically uses large separate clean and dirty water tanks (about 4.5L clean and 4L dirty), enabling frequent mopping with infrequent refills. Reviewers still recommend emptying dirty water regularly to avoid odor and to keep the system running smoothly.

Large clean and dirty water tanks with clear max lines are easy to remove, refill and empty, use plenty of water to wet floors and feed the self-cleaning cycle, and reduce how often users must walk back to the sink.

Its dock-mounted clean and dirty water tanks feed an internal reservoir and recover waste water, and users can adjust wetness in the app while adding cleaning solution directly to the clean tank when desired.

Large solution and dirty-water tanks reduce refill and dump frequency for big spaces.

Large, easy-to-remove clean and dirty water tanks provide ample capacity and simple filling and emptying between sessions.

Large clean/dirty tanks (often 4L) enable hands‑off mopping; robot tank is small but auto-refilled; some docks can be plumbed.

The dock’s separate clean/dirty tanks are large, lift out easily, and have clear handles/indicators. Capacity is frequently described as enough for multi-day to multi-week mopping, depending on how often you run it.

The dock’s clean/dirty water tanks are repeatedly described as large and convenient, supporting longer hands‑off periods. Water usage can be high on aggressive mopping settings, and some reviewers point to a plumbing/water hookup kit to reduce refills.

Reviews highlight separate clean/dirty tanks and automatic refilling of the robot’s internal tank via the dock. Some note tank markings can be unclear, and an optional water hookup kit is mentioned but not universally tested.

The dual-tank layout is praised for separating clean and dirty water, and several reviewers call the tanks large for a spot cleaner. Specific markings include small/large fill lines (about 25 oz and 76 oz) and a dirty tank around 0.5 gal; very dirty automotive carpet can still burn through a lot of water.

The bottom-mounted magnetic clean-water tank design is widely praised for stability and easier steering, with cited capacities around 0.79 L clean and 0.67 L dirty; the tradeoff is that some users describe the dirty tank as small and needing emptying mid-clean, and one owner mentioned minor dripping when setting the unit down.

The clean/dirty water tank system is frequently described as convenient, with reviewers citing generous capacities (for example, 4 L clean and 3 L dirty in one review) and automatic refilling of the robot’s internal tank. Users still need to periodically refill and empty tanks, especially in heavy mopping households.

Large clean/dirty water tanks are a recurring plus for longer intervals between refills/emptying, though you still need to swap water on a regular schedule.

The clean/dirty water tank system is generally seen as easy to manage, with well-designed tanks and clear separation of dirty water. A common tradeoff is capacity: at least one review notes the dirty water tank can be smaller than average, requiring more frequent emptying.

Large dock tanks reduce refill frequency in some homes, but dirty-water emptying can be frequent if you mop often.

Clean/dirty water tanks are central to the hands-off mopping experience; they’re usually easy to remove and clean, but heavy mopping can drain/refill them frequently for some homes.

Clean and dirty water tanks handle mop supply and recovery automatically, so users rarely deal with dirty water directly, though the current opaque tanks rely on app notifications rather than a quick visual water level check.

Reviewers find the fresh-water tank lasts for many cleaning cycles in average-size homes, with owners needing to refill only occasionally even with frequent mopping schedules.

The two-tank setup (clean vs. dirty) is repeatedly discussed as practical and easy to remove; some comparisons suggest Kenmore’s tanks feel larger than Shark’s.

The P50 Pro Ultra’s water tank is automatically topped up from the dock between runs, enabling extended, multi-room mopping sessions where users usually only have to refill the clean tank and empty the dirty reservoir every few cycles.

The system uses separate clean/dirty tanks in the dock plus onboard water management to keep the roller rinsed during cleaning; tanks are removable for rinsing, and early dirty-tank leak issues were reportedly corrected with updated parts.

Reviews describe the solution tank as easy to fill using the marked water and concentrate lines, and it clicks securely into place yet removes quickly for refilling at the sink, with enough capacity for a good-sized kitchen but sometimes needing a refill on very large expanses of flooring.

Its generous dual-compartment water tank can cover a large area of hard flooring and keeps clean and dirty water separate, but because the WashG1 uses water aggressively for thorough washing, users still report having to stop frequently on deeper cleans to refill the clean tank and dump the dirty one.

Stretch S6’s tank capacities are comfortably sized for typical cleaning sessions and noticeably larger than Flexi Pro’s, so refills and emptying are needed less often.

Water tank capacity is enough for roughly 600–700 square feet of combined vacuuming and mopping before a refill is needed.

Built-in water tank (~340–350 ml) supports light-to-moderate mopping runs but must be refilled manually since the dock doesn’t top it up.

The D100’s water system is often described as a dual-compartment or “two-in-one” tank that keeps clean and dirty water separated. Capacity is cited anywhere from ~650 ml fresh/~700 ml dirty to about ~1 liter total. Tanks are generally easy to remove, but filling access and the tight lid/fit draw some complaints.

Uses a small internal water tank (often cited around 300 ml) suited to maintenance mopping; requires manual filling and pad prep, and can be limiting for larger homes or long mopping runs.

Tanks are easy to remove and refill/empty, and capacity is often seen as decent, but several reviews mention frequent dump/refill cycles on big cleanups. Design quirks show up: tall fill shape, small openings that are hard to scrub, and some models’ dirty-tank ‘full’ line limiting usable capacity.

The dual-tank setup (clean and dirty) is widely appreciated, but capacity varies by model: some corded units are called larger than competitors while HF3-style cordless tanks are described as small. Several reviewers also note the dirty/recovery tank can fill quickly.

The clean and dirty water tanks are simple to lift out and rinse at the sink, though some owners wish they held a bit more water before needing to be refilled or emptied.

The clean tank is easy to fill and handle and, despite its smaller three-quarter-gallon capacity, typically covers around 100 square feet per fill and can even edge out some one-gallon rivals in passes per tank, though in real-world use reviewers still report needing at least one refill to finish an 8-by-10-foot rug or other larger spaces, while the dirty tank’s usable capacity is limited by a full sensor so it still needs periodic emptying on large jobs.

The Omni station uses separate clean and dirty water reservoirs, enabling automated refilling and dirty-water handling for mopping. In larger homes or heavy mopping use, users report needing to refill clean water and empty dirty water more often than expected.

Clean and dirty tanks are frequently called small (commonly around ~0.5 L clean and ~0.36–0.38 L dirty). Some users finish a typical session on one fill, but larger homes may require refilling and multiple dirty-tank dumps.

The onboard water tank is repeatedly described as small and manually filled, sometimes requiring refills during larger cleans; when water runs out, the robot can continue vacuuming and alerts you to refill. Several reviews compare this unfavorably to newer docks that automatically refill tanks and wash/dry pads.

The clean and dirty water tanks are relatively small, making the Omni C20 best suited to smaller homes or more frequent refills, though they still support automatic mop pad washing between runs.

Water tank capacity is generally cited in the ~220–254ml range with adjustable water flow. Multiple reviewers note that the tank can run out during larger mopping jobs and that the app may not provide clear low-water alerts; refilling can interrupt or restart cleaning behavior.

Small tank keeps the unit compact and light but requires more frequent refills if you clean more than a room or two at a time.

Smaller clean and dirty water tanks mean more frequent refills and emptying when cleaning larger areas, which some owners find inconvenient.

Small 0.2L water tank is easy to access but requires frequent refills during routine mopping.

The water tank is repeatedly described as small (around 180 mL), limiting mopping coverage and often requiring refills for larger areas. Some reviewers also note limited or no water-flow adjustment through the app.

Smaller clean and dirty water tanks mean more frequent refills and emptying during large cleaning sessions, a common complaint among owners.

Fresh-water tank and separate dirty-water reservoir work well for modest areas, but capacity is relatively small and may require refills for larger rooms or heavy-duty mopping.