Karcher's new pressure washer is powerful, speedy and fuss-free – it made my grimy garden look shiny and new

Every spring, my garden appears to have morphed into something resembling Shrek’s swamp, thanks to a circle of overarching fir trees. They shed a fine green film over absolutely everything – patio, steps, fencing, even the car, if it’s been sitting still for more than five minutes.

So, armed with the Kärcher K5 Comfort Premium, RRP £379, available at Argos, I set about reclaiming my outdoor space over a solid two-week test period in Spring. I used it on my driveway, natural stone steps, timber fencing and, perhaps most satisfyingly, my very grubby car.

This model sits in that tempting middle ground: more powerful than entry-level machines but not quite in pro territory. I’ve reviewed several of the best pressure washers over the years, and the only one that beats the K5 Comfort Premium is Stihl’s RE 120 Plus.

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But while the Stihl may still have my heart, it’s fair to say I was very impressed by this washer overall. Setup is quick, the cleaning results are instantly gratifying, and it makes deeply unglamorous jobs feel weirdly enjoyable. That said, you do need to respect its 145 bar power, especially on painted or more delicate surfaces. Unless you fancy adding “touch-up work” to your weekend plans, as I now have.

From snapping it together in minutes to blasting through weeks of garden grime and giving the car a much-needed glow-up, I’ve properly put the K5 through its paces. At £379, it’s not wildly expensive, but there are cheaper options in the pressure washer market – find out if I think it justifies that little extra spend.

Specifications

• Model number: Kärcher K5 Comfort Premium
• Dimensions (cm): H66.8 x W34.6 x L41.7
• Voltage: 230 - 240
• Wattage: 2.1kw
• Weight: 13.8kg
• Cable length: 5m
• Hose length: 10m
• Pressure (max): 145 bar
• Flow rate (max): 550L
• Nozzles: 4-in-1 multi-jet spray
• Accessories: Detergent dispenser attachment

In a nutshell

The Kärcher K5 Comfort Premium is a powerful, mid-range pressure washer that makes light work of everyday outdoor grime. It’s particularly strong on versatility, thanks to the 4-in-1 multi-jet lance, which lets you switch between spray types without faffing around with attachments mid-clean. The detergent system is equally flexible, offering two ways to apply soap depending on your preference.

Performance is where it really excels. It delivers fast, visible results on everything from cars to stonework. However, that power needs a cautious hand, as it can strip paint or damage softer materials if you go in too aggressively. Obviously, you can switch to a gentler spray. I’m just warning you to tread carefully (not follow my lead at go at everything with the max power rotary spray mode!).

Add in decent onboard storage, a long hose and comfortable trigger mechanism, and it’s a highly capable all-rounder with just a couple of usability quirks. It comes with a 5-year guarantee.

Kärcher K5 Comfort Premium: Unboxing and delivery

Straight out of the box, this felt like a serious bit of kit. It’s fairly heavy, but that weight translates into a sturdy, well-built machine rather than anything flimsy or plasticky.

Assembly was impressively straightforward. I didn’t really need the instructions (always a personal benchmark), but I checked them anyway, and they’re clear and easy to follow if you prefer step-by-step guidance. Everything clicks or slots into place in a logical manner and without too much effort.

The telescopic handle is slightly clunky to extend, but once it’s up, it sits at a comfortable height – even for taller users (I’m 5’ 10). Moving it around the garden is manageable thanks to the wheels, though you’ll notice the weight if you have to lift it.

Storage is well thought out. There are dedicated slots for the lance and handle, the detergent bottle clips neatly onto the side, and both the hose and power cable wind onto the unit. In theory, this keeps everything tidy. In practice, the hose did my head in, but more on that later.

Who will the Kärcher K5 Comfort Premium suit?

If your outdoor space regularly takes a beating – think algae-coated patios, grubby cars, green-tinged fencing and garden furniture you forgot to store away over winter – the Kärcher K5 Comfort Premium will be just the ticket.

It’s ideal for busy households, pet owners, or anyone who’d rather blast dirt away than scrub it off by hand. I’d say it’s probably overkill for the occasional quick rinse-down or smaller spaces. You’ll get the most from it if you’ve got a decent amount to clean and the strength to handle something with a lot of power.

Using the Kärcher K5 Comfort Premium

This is very much a plug-and-go situation – no head-scratching construction or complicated accessories, just click, connect, and you’re off. There is a vague mention of downloading an App for cleaning tips, but I’m very much a “read-the-manual” refuser and preferred to crack on to the fun part.

The Comfort Hold trigger gun is designed to reduce the effort needed to keep it running, and while it does help (you’re not death-gripping it the whole time), I still found my hand and forearm aching after about an hour of non-stop washing. There’s definitely a vibration factor at play too, so pace yourself if you’re prone to aches.

It’s also pretty loud – I clocked around 80dB on my iPhone App – and while it wheels smoothly on flat ground, hauling it up steps is a workout. And the hose? It is long, which is brilliant, but it’s not remotely tangle-free. In fact, we may have fallen out on several occasions as it determinedly wound itself into tight knots.

How did the Kärcher K5 Comfort Premium perform?

Car cleaning

I started with Trisha, my faithful Qashqai, mainly using the rotary nozzle for maximum cleaning impact – she was pure filth! If you enjoy that instant “before and after” transformation, this delivers in spades, and Trisha looked showroom clean in an impressively short amount of time (less than 15 minutes).

I tested the detergent dispenser attached directly to the lance first. There’s a handy dial to control how much soap you use, and naturally, I went full throttle to create a thick, satisfying foam layer. It comes with a bottle of universal cleaner, which I left to sit for about five minutes before rinsing off.

The results were excellent. Dirt lifted quickly, and I barely needed my usual car chamois to finish the job. It felt efficient and smug-inducing – especially when thinking about how much our local car wash costs these days.

I also tried the integrated detergent system, where the bottle clips onto the machine and you switch the lance to soap mode. This dispenses less foam but makes the lance noticeably lighter, which is helpful if you’re doing a longer session.

I suffer from weak wrists and a little RSI from years at a keyboard, so anything that helps with grip and weight-bearing is hugely welcome.

One slight mishap…in my enthusiasm with the max power rotary spray, I managed to strip a bit of paint off a section of my car roof bar. It looked awful, so I kept spraying and wiped the entire section back to black. It’s still not ideal, but I’m just relieved I wasn’t washing my husband’s much newer/posher car!

Entirely my numpty error. In the instruction booklet, it clearly states, “ATTENTION Risk of damage due to too close a spray distance or inappropriate spray type”, but a good reminder that this machine is not messing about.

Garden steps

Next up were the front steps, which, by April, had reached peak neglect. Made from natural sandstone, the dirt was deeply ingrained (probably two years’ worth if I’m honest), and not exactly the best impression given they lead to our front door.

This is where the K5 Comfort Premium really came into its own. The transformation was immediate and deeply satisfying, revealing a much lighter, fresher surface underneath.

However, using the most powerful spray mode, the sprayback was intense. On a breezy day (I had the bright idea to tackle it in 22mph winds), you will get soaked.

While most of the grime disappeared quickly, in a satisfying sea of brown sludge cascading down the steps, there were still a fair few stubborn black mildew spots remaining. I cycled through all the nozzle settings, but they didn’t fully shift.

I decided it was a job more suited to a specialist cleaner, so slapped on some of my all-time fave Wet & Forget, £26.99 at Amazon and left it to work its magic. Even so, the overall improvement was dramatic, and the kind of result that makes you immediately start eyeing up the next filthy surface.

Garden fencing

Finally, I tackled the green film coating my garden fencing – that very ugly residue courtesy of the surrounding fir trees (algae, technically, but “green gunk” feels more appropriate).

Our fence is black-painted timber, and I knew from previous clean-ups that a lighter touch was essential. As I’d learned to Trisha’s peril, the K5 Comfort Premium is powerful enough to strip paint if you’re not careful. Even on the gentlest flat stream mode, standing well back, I lost a few small patches of the black paintwork along the way, but nothing too critical.

It took a couple of passes to make a real dent in the slime, but the improvement was obvious. The frustrating part is that everything looks pristine while wet, only for some of the green to reappear once dry. Not entirely the washer’s fault, but worth knowing.

With patience and a bit of distance control, though, it was very effective and much quicker than scrubbing each fence panel by hand. Just be prepared for the odd touch-up job afterwards if your fence finish is delicate.

What's the Kärcher K5 Comfort Premium like to clean and store?

Storage is one of this machine’s strengths. Everything has a designated place, from the lance to the detergent bottle, and once packed away, it feels surprisingly compact for something so capable.

Maintenance is refreshingly low-hassle. It’s recommended to flush the system with clean water after using detergent to prevent residue build-up, and to store the unit somewhere frost-free to protect internal components. Occasional checks of the filter and connections will keep things running smoothly. Overall, nothing onerous – just a bit of basic care to keep it performing at its best.

The only downside was the integrated hose reel, which is designed to aid neat storage and appears to be a great idea, but in practice, it really wound me up. The hose is billed as tangle-free, but mine had other ideas, twisting itself into tight, stubborn knots that tested my patience. Rewinding it onto the onboard reel was hard work – fiddly, resistant and frankly, the last thing I needed after a couple of hours of pressure washing.

How does it rate online?

Across the board, Kärcher’s K5 models (there are currently 9 to choose from) tend to score highly, and this Comfort Premium version is no exception. Users consistently praise the cleaning power and the convenience of the 4-in-1 lance, which removes the need for juggling nozzle attachments mid-task.

Common complaints mirror my experience: the hose can be prone to tangling, and the reel isn’t the slickest to use. For most reports, these were minor irritations rather than deal-breakers, and on the whole, it gets rave reviews. Durability and performance are where it really earns its reputation, with many reviewers highlighting how well it handles regular, heavy use around the home.

Should you buy the Kärcher K5 Comfort Premium pressure washer?

If you’ve got more than the odd patio chair to spruce up, then yes – the Kärcher K5 Comfort Premium is a worthwhile investment. It’s powerful, quick to set up and genuinely satisfying to use, making grubby, time-consuming jobs far more efficient (and dare I say, enjoyable). It coped brilliantly with everything I threw at it, from car cleaning to deeply ingrained patio dirt.

It's not without its quirks – it’s quite heavy to carry up steps, a tad loud in max power mode, and the hose situation drove me slightly insane at times. You also need to respect the power – this isn’t one for a casual, heavy-handed blast on painted surfaces.

But if you want reliable performance and real cleaning clout, it more than earns its keep.

It’s a fairly new model, so it wasn’t available at my local Kärcher centre when I checked, but I did find it for £379 at B&Q at the time of writing, and £350 at Argos, which seems like a pretty good deal to me.

How does the Kärcher K5 Comfort Premium compare to other pressure washers?

If you’re considering stepping up, the Kärcher K7 Smart Control offers more power and smart features, making it better suited to larger areas and tougher jobs – but it’s heavier and pricier. On the flip side, the Kärcher K4 Power Control is a more affordable, lighter option for occasional use, though it doesn’t deliver quite the same deep-clean performance.

It’s also worth looking at the Kärcher K5 WCM Flex Eco Booster Car & Home, which sits at a very similar price point to the K5 Comfort Premium but comes bundled with a frankly hefty pile of accessories. That might appeal if you like having a tool for every niche job, but having tested and/or owned at least 10 pressure washers over the years, I’ve found most of those extras end up cobweb-covered at the back of the shed. In reality, not much beats the raw effectiveness of a strong, well-directed jet of water.

For me, the K5 Comfort Premium gets the balance right: fewer gimmicks, more focus on core performance.

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Flat roof cleaning

About the review, and our reviewer

Linda Clayton

Linda Clayton lives in deepest Devon with her family and two smelly spaniels. Her garden wraps right around the house, and includes an L-shape patio, cobbled front garden path and stone driveway – i.e. plenty of fodder for pressure washing fun. She tested the K5 Comfort Premium over two weeks, tackling the tasks detailed above, then got a bit carried away with a few that weren’t really on her radar – like the embarrassingly mucky flat roof of her kitchen extension (her husband lifted it up the ladder, he's kind like that!).