Mains pressure washers
If you’ve got an outside tap and a 13A socket, an electric pressure washer is the right tool for the job. It’s lighter than petrol, far quieter, cheaper to run, and it starts every single time. The five machines below are ranked on working pressure, flow rate and hose length, because those are the numbers that decide how quickly a patio actually gets clean.
Every machine here gets a WashRank score out of 100, built from rated bar, litres per hour, hose length and how much control the gun gives you. It isn’t a lab result and we don’t pretend otherwise. It’s a consistent way to compare a £115 Bosch against a £340 Kärcher without the marketing figures getting in the way. Here’s how we review.
- Kärcher K4 Flex
- Kärcher K5 Flex
- Bosch UniversalAquatak 135
- Nilfisk Core 140-8
- Kärcher K2 Home
- Full comparison
- FAQs
Best electric pressure washers at a glance
Kärcher K4 Power Control Flex
130 bar, 420 L/h and an 8 m PremiumFlex hose. Enough machine for cars, garden furniture and a normal UK patio.
Kärcher K5 Power Control Flex
145 bar and 500 L/h, with 10 m of hose. The flow rate is what gets a 30 to 40 m² drive done in one session.
Bosch UniversalAquatak 135
135 bar for under £120, at 7.9 kg. The one to buy if it has to live in a cupboard and come down a flight of stairs.
Nilfisk Core 140-8 PowerControl
140 bar, a metal pump head and 8 m of UltraFlex hose that winds back into the body instead of onto the floor.
Kärcher K2 Home
110 bar, 360 L/h and 4 m of hose. Fine for one car and a bit of furniture, out of its depth on anything bigger.
Electric pressure washers compared
Flow rate is the column people skip and then regret. Pressure lifts the dirt, litres per hour carry it away, and on a driveway that difference is the difference between an afternoon and a whole weekend.
| Model | Best for | Pressure | Flow | Hose | WashRank | Price |
|---|---|---|---|---|---|---|
| Kärcher K4 Power Control Flex | Cars, furniture, a normal patio | 20–130 bar | 420 L/h | 8 m PremiumFlex | 89 | £169 |
| Kärcher K5 Power Control Flex | Cars plus a 30–40 m² drive | 20–145 bar | 500 L/h | 10 m PremiumFlex | 86 | £339.99 |
| Bosch UniversalAquatak 135 | Flats and smaller cars | 135 bar max | 7.5 L/min max | 7 m PVC | 82 | £114.98 |
| Nilfisk Core 140-8 PowerControl | Anyone who wants a hose reel | 140 bar max | 465 L/h max | 8 m UltraFlex, reeled | 85 | £189.99 |
| Kärcher K2 Home | One small or medium car | 20–110 bar | 360 L/h | 4 m | 71 | £147.98 |
| Kärcher K2 Horizontal | Tiny tap-fed jobs | Cheapest way into the Kärcher range, from £59.99 | – | £59.99 | ||
1. Kärcher K4 Power Control Flex: best electric pressure washer overall
The K4 sits at the point where a pressure washer stops being a toy and starts being a tool, and it does it for £169. You get 130 bar, 420 L/h and an 8 m PremiumFlex hose that stays soft in the cold instead of coiling itself back into a spring every time you put it down. The Vario control on the gun is the part that matters day to day: you dial the pressure down at the trigger for a car or a painted bench, then wind it back up for the patio, without walking back to the machine or swapping lances.
There’s also a K4 Home kit at £229 if you want the patio cleaner and detergent bundled in. It’s the same machine underneath, so treat it as a kit choice rather than a different pick. Our full Kärcher K4 review goes into more detail.
Buy it for
- Cars and garden furniture
- A normal UK patio
- Any house with an outside tap and a 13A socket
Skip it if
- You’ve got a long green driveway, where the K5 flow rate earns its money
- You only ever wash one small car, where the K2 will do
- You want the hose reeled into the body, which is the Nilfisk
2. Kärcher K5 Power Control Flex: best for driveways
The step up from K4 to K5 is only 15 bar, which is why the pressure figure isn’t the reason to buy one. The reason is 500 L/h against 420, plus 10 m of hose instead of 8. On a 30 to 40 m² drive that extra flow shifts noticeably more green off the slabs per pass, and the longer hose means you’re not dragging the machine to a new spot every ten minutes. The gun is the same Vario setup, so nothing changes about how it feels to use.
It’s twice the price of the K4, though, and that only makes sense if there’s actually a driveway involved. If you’re weighing the two up, our K4 vs K5 comparison lays it out properly, and the driveway guide covers the surface cleaner side of it.
Buy it for
- Cars plus a 30 to 40 m² drive
- Bigger jobs where flow rate saves real time
- The extra 2 m of hose
Skip it if
- It’s cars and garden furniture only, in which case keep the K4 and the £170
3. Bosch UniversalAquatak 135: best value electric pressure washer
135 bar for under £120 is the best pound-for-bar deal on this page, and the 7.9 kg body is the reason to pick it over anything else if storage is the problem. It comes up a flight of stairs in one hand. The 3-in-1 nozzle covers the usual jobs without a bag of attachments, and the detergent bottle clips straight onto the lance rather than sitting in the machine, which is one less thing to trip over.
The compromises are the 7 m PVC hose, which is stiffer in cold weather than the Kärcher PremiumFlex, and a gun that doesn’t show you which pressure step you’re on. Neither matters much on a balcony or a small car. There’s more in our Bosch UniversalAquatak 135 review.
Buy it for
- Flats and small outdoor spaces
- Smaller cars
- Carrying up and down steps
Skip it if
- You want 8 to 10 m of hose
- You want a gun that shows the pressure step you’ve selected
4. Nilfisk Core 140-8 PowerControl: best hose reel
Anyone who has spent ten minutes untangling 8 m of hose off a garage floor understands why the reel is worth £190. It winds back into the body, so the machine goes away as one object. The metal pump head is the other reason this one is here: aluminium sheds heat better than plastic and takes long sessions rather better for it, which matters if you clean in one big annual push instead of little and often.
PowerControl gives you three steps at 100, 80 and 60%, which is a coarser adjustment than the Kärcher Vario but covers the jobs you’d actually use it for. Registering the machine takes the warranty from 2 years to 5. Our Nilfisk guide covers the rest of the range.
Buy it for
- A hose reel built into the machine
- A metal pump head at this price
- Staying out of the Kärcher ecosystem
Skip it if
- You’ve already got Kärcher bottles and lances in the shed
- You just want the cheapest capable machine, which is the Bosch
5. Kärcher K2 Home: for small jobs only
Be clear about what the K2 is. At 110 bar and 360 L/h with a 4 m hose, it’s a machine for one car and a bit of garden furniture, and the air-cooled motor is built for short sessions rather than an afternoon of patio work. The Home box includes the small T 1 patio cleaner rather than the T 5, which tells you what Kärcher expects you to do with it.
At £147.98 it’s also worth noticing that the Bosch costs less and does more. The K2 makes sense if you specifically want the Kärcher accessory system on a small machine. If there’s any chance you’ll take on the patio, buy the K4 now rather than replacing this in a year. Our K2 vs K4 comparison and K2 review cover it. There’s a cheaper way in still, the K2 Horizontal at £59.99, which suits tiny tap-fed jobs and nothing more.
Buy it for
- One small or medium car
- Light garden furniture
Skip it if
- You’ve got two cars to keep on top of
- The drive is mossy
- You already know the patio gets done twice a year, in which case buy the K4
When mains is the wrong tool
An electric pressure washer needs two things: a tap it can draw from and a 13A socket it can reach. If either one is missing, the answer isn’t a bigger machine, it’s a different kind of machine.
No socket, or no tap? A cordless pressure washer runs off a battery and feeds from a bucket or a water butt. You give up pressure and runtime, but it goes where a mains machine can’t. Buying a K5 does not solve an extension lead problem.
Plot measured in acres? That’s the only case where petrol makes sense. For a normal garden and driveway it’s more noise, more weight and more maintenance than the job needs.
For most UK homes neither applies, and mains is simply the answer. If you want to narrow it down by the job rather than the machine, we’ve got guides to the best pressure washer for cars, driveways and patios.
Electric pressure washer FAQs
What’s the best electric pressure washer for most people?
The Kärcher K4 Power Control Flex at £169. It has 130 bar, 420 L/h and an 8 m PremiumFlex hose, which covers cars, garden furniture and a normal UK patio without pushing you into K5 money. If the budget is tighter, the Bosch UniversalAquatak 135 does most of the same jobs for £114.98.
How much pressure do I need to wash a car?
Less than you’d think, and the useful part is being able to turn it down. The Vario control on the K4 and K5 guns lets you drop the pressure at the trigger for paintwork and wind it back up for the patio, without changing lances. Both Kärcher machines start at 20 bar, which is gentle enough for bodywork and trim.
K4 or K5: which should I buy?
Buy the K4 unless there’s a driveway. The pressure difference is only 15 bar, so the real gap is 500 L/h against 420 and 10 m of hose against 8. That flow rate is what makes a 30 to 40 m² drive a single-session job. For cars and furniture alone, the K4 does the same work for roughly half the price.
Is 135 bar enough for a patio?
For a small patio, yes. The Bosch UniversalAquatak 135 tops out at 135 bar, which is in the same territory as the K4. What you give up is flow rate and hose length, so bigger areas take longer and you move the machine more often. On a large or heavily mossed patio, the K5 finishes noticeably sooner.
Do I need a hose reel?
Not strictly, but it changes how often you use the thing. The Nilfisk Core 140-8 winds its 8 m UltraFlex hose back into the body, so putting it away is one action rather than five minutes of coiling. If your machine lives in a tight garage or you clean in short bursts, it’s the feature you’ll notice most.
How long should the hose be?
Longer than you expect, because the hose does the walking. The K2 Home ships with 4 m, the Bosch 7 m, the K4 and Nilfisk 8 m and the K5 10 m. Anything under about 7 m means repositioning the machine constantly on a driveway, which is the main reason cheap machines feel slow.
Is the K2 Home enough for a driveway?
No. At 110 bar, 360 L/h and 4 m of hose it’s built for one small or medium car and light garden furniture, and the box includes the small T 1 patio cleaner rather than the T 5. If there’s a mossy drive or a patio in your plans, the K4 is the machine to buy instead.
What if I haven’t got an outside tap or socket?
Then a mains machine is the wrong choice, whatever the spec. A cordless pressure washer runs on a battery and draws from a bucket or water butt, which is the fix for a missing tap or socket. Petrol is only worth the noise and weight if the plot is genuinely large.
More pressure washer guides
We may earn a commission if you buy through links on this page, at no extra cost to you. WashRank scores come from published specifications, not laboratory testing. Prices were correct at the time of writing and change with sales.