Start with your home, not the specification
Which? says cordless sticks suit smaller homes with less carpet, quick cleans and people who find heavier machines hard work, and that corded models are the better choice for whole-house cleaning and carpet-heavy homes. A flat with hard floors and a cupboard by the door is the easiest case for a cordless vacuum. A three-storey house with deep carpets is the hardest.
If you are unsure, time a typical clean at the power level you would use and compare it with the runtimes in the next section. A cordless vacuum that stops before the job is done is a nuisance whichever model it is, and our comparison of cordless and corded vacuums sets out how the two types differ.
How to read a runtime claim
A runtime on a box or a listing title is a maximum measured under a condition. Vax’s 45 minutes was measured in standard power mode on a hard floor with the floor brush switched off. The 60 minutes Shark gives for the Stratos IZ400UKT in our listing is in ECO power mode with a non-motorised tool, and Kärcher gives about 30 minutes in standard mode without an electric floor nozzle and up to 18 minutes at its highest power level. Bosch’s 40 minutes for the Unlimited 7 and Readyy’y, Beko’s 60 minutes and Numatic’s 70 minutes for the Henry Quick come with no conditions on the pages we read.
Which? says minimum-power runtime should be at least 30 minutes and more likely around an hour, that around 15 to 16 minutes on maximum power is decent, and that it has found models that overstate battery life by as much as a third. When a maker prints no condition, neither we nor you can tell which mode the figure describes, so treat it as a ceiling.
Motorised heads and tools draw on the battery too. Vax’s footnote says the floor brush is off, and Shark’s says the tool is non-motorised, which is a reminder that a motorised head uses the battery and that neither maker gives a runtime for it. The Gtech AirRAM 2 K9 has one power setting, so its 40 minutes is easier to read, though Gtech adds that runtimes may vary with the floor surfaces cleaned.
Removable batteries, charging and replacement
A removable battery can be charged off the machine and, in principle, replaced when it wears out. The Vax, Gtech, Henry Quick and Shark pages in our listing say the battery is removable, Bosch calls the Unlimited 7 pack exchangeable, and Numatic’s data sheet for the HVB160 lists a quick and easy battery change. The Bosch Readyy’y and Flexxo pages, Beko’s and Kärcher’s do not say. Which? says swappable batteries usually cost extra, so ask whether a spare is sold before you count on one to double the runtime.
Charge times quoted by the makers run from 150 minutes for the Henry Quick to 345 minutes for the Kärcher, and the five examples here take 3 to 5 hours. A long charge is not a fault, but it matters if you clean in short bursts through the week and the battery is flat when you want it.
Bin size, weight and emptying
Which? puts the average cordless dust capacity at about 0.7 litres, against about 2.3 litres for a corded vacuum. In the five examples the bins are 0.3 l, 0.4 l, 0.6 L and 0.8 L, and Numatic’s bagged HVB160 holds 6 L. A small bin means more trips to the outdoor bin. The Henry Quick takes a different route and empties into disposable pods that Numatic says keep emptying dust-free.
Weight shows up at the top of the stairs. The makers’ figures run from 2.4 kg for the Bosch Readyy’y to 3.3 kg for the Gtech among the sticks and uprights here, against 6.88 kg for the HVB160, and Which? puts the average cordless at about 3 kg. The figures are not measured the same way: Bosch’s are measured ready for operation, Kärcher’s are without accessories and Gtech gives a headline weight, so use them as a guide and not to the gram.
Attachments, floor heads and handheld mode
Check the tool list against the jobs you have. The Bosch Unlimited 7 lists a flexible extension hose, a long crevice nozzle, a mini power brush and a furniture brush with upholstery nozzle. The Vax Blade 4 Pet lists a Mini Motorised Pet Tool, crevice tool and dusting brush. The Gtech box list has a Hair Removal Tool but no crevice or upholstery tool, and Numatic’s HVB160 page lists no tools, though its data sheet names a kit.
Handheld mode matters for stairs, sofas and the car. Which? says many cordless vacuums have one but some, including some Gtech models, do not. Bosch describes the Readyy’y as a 2in1 that works as a handheld and a handstick, and the Gtech page for the K9 mentions no handheld mode.
Carpet, hard floors and pet hair
Which? found that, on average, the cordless vacuums it tested picked up 41% of carpet dust and the corded ones 70%, with the best cordless scoring 83% and the best corded 86%. Averages hide wide differences between models, and we have not tested these, so nothing here says a cordless vacuum cleans carpet well. What the makers do document is the floor head. Bosch describes the Unlimited 7’s brush as tackling deep, fluffy carpets, and Gtech lists carpets, hard floor and homes with pets for the K9.
For pet hair, look for a pet tool and a way to deal with hair on the brush. The Vax Blade 4 Pet lists a Mini Motorised Pet Tool and Gtech a Hair Removal Tool. What those do to real pet hair is something only testing can show, and this guide makes no claim about it.
Where it lives and where it charges
A cordless vacuum needs a plug point wherever it charges and a place to stand. Bosch lists a docking station with the Unlimited 7, Vax a wall mount with the Blade 4 Pet and the Bosch Readyy’y stands up by itself. The Gtech upright is full height and the HVB160 is a cylinder, so both need floor space. Measure the spot before you choose, and check that the dock does not block the way you walk.
Filters and the word HEPA
None of the five examples is described as HEPA by its maker’s page. Bosch’s pages name no filter type for the Unlimited 7 or Readyy’y, Vax and Gtech call theirs washable, and Numatic lists a Tritex filter with HepaFlo bags, where HepaFlo is the name of the bag. A washable filter is not the same as a HEPA filter.
Allergy UK recommends a vacuum cleaner with a HEPA filter that does not blow out dust, and says that measures against house dust mite lower but do not remove the allergens. We make no claim that any of these vacuums removes allergens, bacteria or viruses.
Charging safely and disposing of the battery
Electrical Safety First says that many modern floor cleaners use lithium-ion batteries, so take care when charging, use only the original charger or one sourced from or approved by the manufacturer, and unplug when the cleaner is not in use or being charged. Charge it where you would be comfortable to leave a charging device, not on a pile of soft furnishings.
When a battery wears out, do not put it in the household bin. Electrical Safety First says rechargeable batteries, and cordless appliances with them, should go to a local recycling centre, or you can check your local council’s website.
Common buying mistakes
The first mistake is buying on the headline minutes. The second is assuming the battery can be replaced without asking the maker. The third is forgetting the bin: a 0.3 l container suits a quick tidy and is tiresome for a whole house. A fourth is trusting the title. The Amazon.co.uk title for the Henry Quick says up to 60 minutes, where Numatic’s own table gives 70 minutes on low and 14 minutes on high.
The last is treating a manufacturer’s feature as a result. Anti-hair-wrap, ‘powerful’ and ‘up to 3x the power’ are claims, and none of the pages we read backs them with a measurement we can use.