We could remove most dirt in the weaker mode. When it got really dirty, we made use of the turbo mode. The attachments’ contribution to the cleaning process Bosch Unlimited 8’s noise level is measured between 67 and 71 dB, which is tolerable, and I could still have a conversation with my wife while vacuuming without raising my voice. This volume is quieter than many of its premium cordless competitors, including the Dyson V15, which produces 71 to 76 dB of noise. Display Screen This is less powerful than the low power modes on all its key rivals. The Dyson V8 and V7 are far more powerful, as are the Xiaomi Roidmi F8 and X20 and the Shark DuoClean Wireless. Even the budget Beldray Airgility Max produces more suction than the Bosch at low power. The brush has its own drive and rotates automatically. This way, it transports the dirt better into the suction tube. Another unique feature of the design is the exchangeable battery of the Bosch Unlimited Pro Power. You can remove the battery at the push of a button and insert a new one. Bosch was one of the first manufacturers in the UK to implement this, and many have followed suit.

The Turbo mode is a very, very different story, albeit one you must manually engage every time you switch on. Punch that button on top and the BCS122GB does a Tesla and goes ‘Insane’. Suction and airflow are multiples of the normal power mode, delivering great cleaning ability. Jekyll and Hyde? You bet.On carpet, a little more was left behind. I measured 96% of the spill collected, though a visible dusting remained after the first pass. I found it was best to employ the upholstery brush, as the velvety bristles had just enough agitation to gather the remnants from our short pile carpet. Clip-on tools include a 2-in-1 furniture nozzle with pull-down dusting brush and a bonkers long and very flexible crevice tool. That is ideal for getting down behind radiators, but takes some wielding to accurately pinpoint spots of dust. A good-length metal tube optionally extends reach for all tools. Clips and fittings between tools and tubes are top-notch. There’s a small LED light on the top that lights up when charging or when vacuuming. Then you can see what the battery status is.

Joe, our wireless vacuum expert on the Smart Home Fox team, has spent over half a decade meticulously testing every model that has landed with us. The filter is durable, and you don't have to wash it, just tap it out. That works well, and we liked it. Cleaning the brush Nearly an hour and a half is the longest battery life I’ve seen so far. The Bosch Unlimited 8 comes with two interchangeable batteries, meaning you have almost three hours in total to vacuum! The Dyson V15’s battery is also removable and replaceable, so you can double its run time by purchasing extra batteries.At 65dB, the BCS122GB competes with some of the market’s best low-noise and ‘silence’ mains cleaners. You won’t disturb the neighbours even during midnight cleaning sorties.

Things change when Turbo is engaged but the Bosch still isn’t great. It’s more powerful this time than the Beldray but lags behind the Dyson, Xiaomi and Shark vacuums. The cleaning performance on hard floors was outstanding. It just took a little longer with the lentils and the oat flakes because it pushed a few lentils in front of the brush at first. Unusually, the BCS122GB has a single filter unit, rather than the multifarious foam, paper, mesh and pleated filters of its rivals. But thanks to Bosch’s very sleek filter design that doesn’t diminish the filtration, and the company claims that a hygienic 99.9% of particles will be captured. Even using normal power mode with the motorised floorhead we got around an hour’s worth of cleaning. That is truly outstanding run time. Turbo mode with the non-motorised tools delivered around 14 minutes.There are no unnecessary additions, buttons or edges. The device’s design contains everything it needs for its actual task - no more, no less.

This combination allows Bosch to claim ‘unlimited’ runtime for this cleaner. On standard power setting, it will go for an hour, and the charger can power up a battery in 55minutes. With the two batteries, theoretically, you simply won’t run out of power. The head’s superb articulation allows it to turn into all but the tightest of turning steps, although it remains too large to flip up and do the verticals. For those, we used the triangular upholstery tool, which was effective if not swift. The Bosch Unlimited 8 has no screen. Instead, it has a small LED light on the top that will light up when vacuuming or charging. That is great, but adding a display would make it better. Attachments Bosch Unlimited 8 On top of the body is the Turbo switch. That might not be as corny as Tesla’s ‘Insane’ power mode, but it seriously ramps up the BCS122GB’s suction. Runtime takes a nosedive accordingly. On normal power mode with no tools, this cleaner barely registered 65dB of noise output. That is much quieter than most of its premium cordless competitors and the sound is an inoffensive drone – as opposed to the dentist-drill sound of some.The device sits nicely in the hand when vacuuming. The weight is well-distributed, so it’s not exhausting even if you clean for more extended periods. Bosch claims that this filter system that the air is 99.9% clean when it gets out of the device. And indeed, when you pull out the filter, you can see that it catches a lot of dirt and small particles. The bin itself takes a little getting used to as it releases from the cleaner by tipping forward and away. Emptying is as simple as pulling out the filter unit and tipping out the contents. We first saw this tech on some of Bosch’s mains-powered cleaners and it worked well for both filtration and reducing the filter cleaning chore. It’s not washable though, so we do wonder how its performance will fair over time when particles get permanently lodged in its fibres.