Kärcher WV 6 Plus Review: Brilliant on Condensation, Less So on Dirty Glass
Kärcher’s top battery window vac runs for 100 minutes and holds 150ml of dirty water, and every source we found loves what it does to a steamed-up bedroom window on a January morning. Whether it cleans a grubby outside window without streaks is where the reviews split — and the version on the shelf now has a second, narrow nozzle that older listings do not.
Where the reviews line up
Our evidence comes from two home tests — Ideal Home and the home editor at Mumsnet — a 72-reply owners’ thread on Mumsnet Talk, and 124 buyer reviews at Argos averaging 4.4/5. On the main job most people buy it for, they agree completely.
Condensation is what it does best. Mumsnet’s editor scored it 5/5 for clearing condensation after daily use through a February, and Ideal Home’s tester made it part of her morning routine in a 1930s terrace. Owners on the forum use theirs the same way, plus on shower screens and mirrors after every shower. The battery is the other point of agreement: Kärcher claims 100 minutes, and a third tester, Gareth Butterfield for the Yorkshire Post, still had close to an hour left after a conservatory and a week in a motorhome. The minute-by-minute countdown display gets singled out by both editorial testers.
Streaks are where they part company. Ideal Home calls the finish streak-free on mirrors and shower glass. Mumsnet’s editor gave it 2/5 for window cleaning, saying the blades drag and streak and she had to follow up with a cloth. Butterfield says dirt builds up in the rubber on very dirty exterior glass and needs wiping between passes. Read together, it is a superb water remover and a decent finisher on glass that is already fairly clean — not a substitute for a proper wash on a grimy outside window.
Buy the current “Plus N” version (order number 1.633-751.0), which adds a 170mm narrow nozzle for small panes and door glass. At around £70 to £120 depending on where and when, it is a lot of money for a squeegee — but if condensation is a daily fight, it is the tool every source would keep.
The three reviews this summary is built from
- Ideal Home and MumsnetTwo home tests of the WV 6 Plus N on condensation, windows, mirrors and shower screens. One glowing, one critical on streaks.
- Mumsnet Talk72 replies across three pages, January 2023. Owners on long-term use — mostly of the cheaper WV 1, so read with care.
- Argos4.4/5 from 124 customer reviews, as reported by a Latest Deals listing. We could not open the Argos page itself.
Before the review: WV 6 Plus or WV 6 Plus N?
You will see two versions on sale. The WV 6 Plus N (order number 1.633-751.0) is the one Kärcher UK lists now: same 280mm main nozzle, 100-minute battery and 150ml tank, plus a 170mm narrow nozzle in the box. The older WV 6 Plus (1.633-510.0) has only the wide nozzle, according to Mumsnet’s review. Kärcher’s own UK page simply calls the current model “WV 6 Plus”, so check the order number on the listing, not the name. The cheaper WV 2 Plus N is a different machine: 25 minutes per charge, a 100ml tank and a battery that does not come out, on Kärcher’s comparison sheet.
Specification at a glance
| Spec | Figure | Confidence |
|---|---|---|
| Run time | 100 minutes per charge, with minute-by-minute LED countdown | Kärcher UK product page; repeated by Mumsnet and Ideal Home |
| Area per charge | Approx. 300 m² of glass | Kärcher’s figure. Kärcher does not convert it into a number of windows, and neither will we |
| Charge time | 170 minutes | Kärcher UK and Kärcher comparison sheet |
| Battery | Lithium-ion, 3.65 V, removable | Kärcher comparison sheet |
| Nozzle widths | 280 mm main; 170 mm narrow (Plus N only) | Kärcher UK page for 1.633-751.0; Town Tools listing |
| Dirty water tank | 150 ml | Kärcher UK; Mumsnet |
| Weight | 0.8 kg with battery (Kärcher) · 1.17 kg (Argos listing, as quoted by Latest Deals) | Sources disagree. The higher figure probably includes accessories or packaging, but the listing does not say |
| Dimensions | 126 × 280 × 310 mm (L × W × H) | Kärcher UK |
| In the box (Plus N) | Window vac, 280 mm and 170 mm nozzles, quick charger, premium spray bottle with microfibre cloth, 20 ml window-cleaner concentrate | Town Tools listing; Ideal Home adds a dirt scraper on the spray bottle |
| Guarantee | 2 years standard; 3 years if bought from Kärcher UK direct. No registration needed for window vacs | Kärcher UK guarantee page. The “up to 6 years” banner applies to pressure washers and pumps, not this |
| Typical UK price | £65–£120; RRP quoted at £109.99 | Five price points, December 2025 to October 2026 — see below |
Ideal Home and Mumsnet
Both testers used the current Plus N model in real homes rather than a lab, and both bought into it for condensation. Ideal Home’s tester used it daily in a 1930s terraced house and calls it a gamechanger: water gone in seconds, a tank that is easy to empty into the sink, and a streak-free finish on mirrors and shower screens. She lists the full kit — two suction heads and Kärcher’s premium spray bottle with microfibre head, dirt scraper and concentrate — and mentions no weaknesses at all, which is itself worth noting.
Mumsnet’s editor is the more useful read because she scores each job separately. Condensation 5/5, battery 5/5, weight 5/5, value 4/5 — and window cleaning 2/5. Her complaint is specific: the rubber blades that catch condensation so well drag on the glass and leave streaks, so she finished with a cloth. She also notes the enclosed tank stops water pooling on the sill, and that the plain WV 6 Plus is cheaper but lacks the narrow nozzle. A third tester, Gareth Butterfield for the Yorkshire Post (February 2026), sits between the two: streaks only on very dirty exterior glass, where grime builds up on the squeegee edge, and a spray-bottle cap that leaked when tilted until he tightened it.
Watch: Karcher WV6 Plus N vs Titan Window Vac: Unboxing, Review & Comparison
An unboxing of the current Plus N against a cheaper rival — the clearest way to see the two nozzles and the spray kit the editorial testers describe.
Watch on YouTube ↗Mumsnet Talk
An important health warning first: most posters in this thread own the older, cheaper WV 1, not the WV 6. We include it because it is the best long-term evidence we found on Kärcher window vacs as a family — the blade principle, tank design and failure points are shared — and because no WV 6-specific owners’ thread of any size turned up. More than 25 posters recommend theirs and on the first page we found no one telling the original poster not to buy.
The uses match the editorial tests: water off big sash windows every morning, then mirrors and shower doors, with one owner crediting it for not having a spot of black mould on her shower. The criticism is about the cheaper model’s battery — “needs charging fairly frequently” — which is exactly what the WV 6’s 100 minutes is meant to fix. Two other notes carry over to any model: water can dribble out when you work small panes, and on dirty glass you will get “a few streaks but not too bad if the windows are reasonably clean”. Several owners report five to ten years of use, which is reassuring for a battery product with a two-year guarantee.
Watch: Karcher WV6, window vac, Is it worth it?
The worth-it question the forum keeps asking, put to the WV6 specifically rather than the cheaper models most posters own.
Watch on YouTube ↗Argos
We could not open the Argos product page directly — it returned navigation only — so the 4.4 from 124 is second-hand, quoted by a deals site that lists the product at £68. The listing does not say when the rating was captured, and it does not break the reviews down, so treat it as a sense of owner satisfaction rather than a measured result.
The same listing is useful for one reason: it is where the 1.17 kg weight comes from, against Kärcher’s own 0.8 kg with battery. We have printed both. It also repeats the 2-year manufacturer guarantee, the 0.15-litre tank and the spray bottle, microfibre cloth and concentrate in the box. A 4.4 average across more than a hundred buyers fits the editorial picture: most people are pleased, and the minority who are not are usually the ones expecting a streak-free result on dirty outside glass.
Watch: Karcher WV 6 Plus Window Vacuum Squeegee Review - Is It Any Good?!
A buyer-style verdict on the WV 6 Plus — the kind of hands-on view that sits behind a retailer star rating.
Watch on YouTube ↗Strengths and weak points
What holds up
- Clears condensation in one slow pass with no drips on the sill — every source agrees.
- 100-minute battery with a minute-by-minute countdown, not three vague lights.
- 150ml tank, half as big again as the WV 2 Plus N’s 100ml, so fewer trips to the sink.
- Removable battery, unlike the cheaper WV 2 Plus N.
- Plus N version adds a 170mm nozzle for small panes and door glass.
- Light at 0.8 kg by Kärcher’s figure; Mumsnet’s editor scored weight 5/5.
- Works on shower screens, tiles and mirrors as well as windows.
What people complain about
- Streaks on dirty glass: Mumsnet’s editor scored window cleaning 2/5.
- Grime builds up in the rubber blade and needs wiping between passes.
- The spray-bottle cap can leak when tilted until tightened.
- Water can dribble out when working small panes.
- Long 170-minute charge.
- Only a 2-year guarantee unless you buy direct from Kärcher (3 years).
- Two versions on sale under similar names — check the order number.
Price check
The quoted RRP is £109.99 (Yorkshire Post, December 2025; Kärcher’s UK page showed us no price). On 5 October 2026 Town Tools listed the Plus N at £119.99 and Costco at £99.99 (members only). Deals regularly take it far lower: £65 at Amazon in December 2025, £70.33 in February 2026, and £68 at Argos on an undated Latest Deals listing. Mumsnet’s review gives £82. Our advice: it drops to around £70 often enough that paying over £100 is rarely necessary.
Who it actually suits
Buy it if you wake up to running windows every winter, have a glass shower screen you want dry after every use, or have a conservatory or motorhome full of glass. If you are fighting damp, it pairs naturally with a dehumidifier: one removes the water you can see, the other the moisture in the air.
Look elsewhere if your main aim is sparkling outside windows — a proper wash and a cloth finish, or a window cleaner, still wins on dirty glass. If you only have a few small windows, the WV 2 Plus N costs less, though its 25-minute battery and fixed cell are real downgrades.
What we could not check
- The videos. We confirmed each video by its exact address and title appearing in two differently worded search listings, not by opening it on YouTube, and no listing named the channel.
- Argos rating, first hand. The 4.4/5 from 124 reviews comes from a Latest Deals listing; we could not load the Argos page or see the date the rating was taken.
- Weight. Kärcher says 0.8 kg with battery; the Argos listing says 1.17 kg. We could not find out what the higher figure includes.
- Windows per charge. Kärcher publishes about 300 m² per charge, not a window count. Your result depends on pane size and how dirty the glass is.
- Independent lab testing. We found no Which? result, and no UK test that measured run time or streaking. The editorial sources are home tests.
- The year of Mumsnet’s test. The review says the editor used it through February but we could not confirm which year.
- Battery replacement cost and life. The battery is removable, but we found no UK price for a spare or any figure on how many charges it lasts.
- The forum is mostly about the WV 1. No WV 6-specific owners’ thread of any size turned up.
- Kärcher’s own UK price. Its product page showed no price when we checked.
Sources last checked 5 October 2026. Prices change often on this product — check the order number and the price against the listing in front of you before buying.