Below it sits a slider switch, which lets you change the cleaner’s mode: Hard Floor, Carpet and Deep Pile. This slider adjusts an air valve to reduce power as you move from hard floor up to deep-pile carpet. Next, I moved to the harder carpet tile edge test, with the Shark NZ850UKT charged with removing all flour right up to the skirting board. This it did easily, and I didn’t have to reach for the crevice tool to finish off the job.

Pet hair performance was excellent, too, with the Shark PZ1000UKT able to easily remove all of the hair in a single pass.With the bin removed, you can see one of the washable filters, with a second HEPA filter located at the front of the vacuum. This, too, is easy to remove and clean. I tested the Shark NZ850UKT with my standard tools to measure performance in airwatts (AW), an industry standard that combines both suction and airflow. On the had floor more I measured the cleaner at 260.02AW, which is about as powerful as you’ll get from a regular cleaner given that vacuum’s have a maximum power limit. Switching to carpet mode, power drops slightly to 233.96AW, and down to 130.19AW on deep pile mode. The latter might sound a bit low, but this power level stops the vacuum cleaner from clogging up. The other recent innovation that Shark has brought to this model is the screen and control panel on the top of the handle, which debuted on the Shark IZ300UKT. This is mostly to display how much battery capacity you have left, shown as a percentage that decreases in increments of 10%. It isn’t as accurate as the battery gauge on the Dyson V15 Detect or V11 Outsize, but you get more information than on most cordless models.

It’s an improved controller over the previous model, which had a manual air vent and just a slider for hard floor and carpet modes. Here, on the Shark NZ850UKT, the power selector lights up your choice with an LED but only when the wand is plugged in fully; remove the wand or handle and you can’t see which mode you’re on. That’s not such a problem, as with handheld tools, you probably just want the maximum power by sliding the selector fully forward. Shark provides a crevice tool, brush and a mini pet tool in the box, which is excellent for stairs and for getting hair off sofas. Once you’ve released the bin, though, emptying is simple. There’s a handle on the top and a button on the front to release a trap door in the bottom, which allows the dirt to fall out with minimal further encouragement. Shark’s anti-tangle floor head works wonders at keeping the rollers free of hair, too.

With the bin removed, you can reach the main filter; there’s a second post-motor HEPA filter at the bottom. Clean both regularly to keep the vacuum cleaner operating at peak performance. Performance While raw suction performance is a good measure of performance, real-life results show how good a vacuum cleaner really is. To this end, I put the cleaner through my regular set of tests. First, I started with my carpet test, sprinkling a teaspoon of flour onto my test carpet. That’s where Lift-Away mode comes in. Press the button on top and the main vacuum and bin lift off the cleaner. This gives you a handy cylinder cleaner that you can move where you want it. It didn’t carry its perfect performance over to the flour test, but it still did a decent job. On hard floor, I measured 44g of a 50g spill making it into the collection bin. However, apart from a small residue near the start of our pass, it certainly didn’t leave 6g of flour behind. I suspect most of the missing flour was lining the tubes or caught in the floor head and would work its way into the bin eventually as I performed other cleaning tasks. The only time you’re likely to hit an issue is when you want to get under a dining chair, for example, since the large bin gets in the way. That’s where Lift-Away mode comes in: you can remove the entire cylinder and bin and hold it in your hand while cleaning. This lets you use the floor head and get it right under furniture.