Buying a pressure washer should be simple. In practice, most people walk into Screwfix or scroll Amazon, see a wall of numbers they don’t recognise and end up either overspending on power they’ll never use, or buying the cheapest option and wondering why it can’t shift two winters of green algae off the patio.
This guide cuts through the marketing. We’ll explain what the headline numbers actually mean, help you match a machine to the jobs you really do, and flag the handful of features that are worth paying for. By the end, you’ll know exactly what to buy — and what to ignore.
Start with the Jobs, Not the Numbers
Before you look at a single model, write down what you want to clean. Pressure washer shopping tends to go wrong because people pick the machine first and then try to justify it. Flip it around.
Most UK gardens involve some mix of these:
- A car, perhaps a van or a caravan
- Patio slabs, paving, decking or a path
- A driveway (block, tarmac or concrete)
- Fences, garden walls and a shed
- Garden furniture, bins, kids’ toys and sports kit
A small paved yard with a car is a very different challenge from a 60-metre block driveway with three outbuildings. Write your list first. Then read on.
Understanding the Key Specifications
Pressure washers are sold on three numbers: bar, flow rate and motor power. Get a handle on these and the spec sheets become readable.
Bar (Pressure)
Bar is the pressure at which water leaves the nozzle. Higher bar means more cleaning punch on stubborn dirt like ingrained moss and tyre grime. For UK domestic use:
- Under 100 bar: suitable for cars and light furniture only
- 110–130 bar: the workhorse range for most homes
- 140–160 bar: handles driveways and heavy patio cleaning
- 180 bar and above: semi-professional territory, usually petrol
It’s tempting to buy the biggest number you can afford, but more bar on a delicate surface can shred paintwork, strip pointing from between slabs and lift timber fibres on decking. Matching the washer to the job beats raw power every time.
Flow Rate (Litres per Hour)
Bar gets the attention, but flow rate often matters more in real life. Flow rate is how much water the machine pushes out every hour, usually given in litres per hour (l/hr) or sometimes litres per minute (l/min). Higher flow rinses dirt away faster and means less time standing in the drizzle.
For context, 400 l/hr is fine for cars and furniture, around 450–480 l/hr handles most patios comfortably, and anything over 500 l/hr starts to feel like a big step up in productivity on larger jobs.
Motor Power (Watts)
Wattage roughly tells you how much work the motor can do, but it’s not a direct proxy for cleaning power. A well-designed 1,700W machine can outperform a poorly engineered 2,000W unit. Use wattage as a sanity check rather than a headline figure — if two washers have similar bar and flow but one has noticeably lower wattage, it may struggle under sustained load.
Electric or Petrol?
Most UK households should buy electric. Petrol has its place, but it’s a specialist choice.
Go Electric If…
- You have a mains socket within reasonable reach of where you want to clean
- Total cleaning time is under an hour at a go
- You live in a terrace, semi or standard detached property
- You’d rather not deal with fuel, oil changes and servicing
Consider Petrol If…
- You’re working away from mains power regularly
- You have a large driveway, smallholding or agricultural needs
- You already maintain other petrol garden tools and don’t mind the upkeep
- You’re using it semi-commercially (valeting, window cleaning, gutters)
Petrol units are noisier, heavier and pricier to run, but they are genuinely more powerful and completely portable. For the average UK back garden, they’re overkill.
Matching the Machine to Your Garden
Here’s a simple way to bucket machines by typical UK use. Don’t treat the numbers as absolute — different brands tune their units differently — but this gets you in the right ballpark.
| Usage Level | Typical Jobs | What to Look For |
| Light | Cars, bikes, patio furniture, bins | 100–120 bar, 350–400 l/hr, 1,400–1,700W |
| Medium | Patios, decking, fences, small driveways | 120–135 bar, 420–480 l/hr, 1,800–2,000W |
| Heavy | Block driveways, larger paving, outbuildings | 140–160 bar, 470–550 l/hr, 2,100–2,500W |
| Pro / Petrol | Smallholdings, large driveways, commercial | 180 bar plus, 600+ l/hr, petrol engine |
Features Worth Paying Extra For
Most pressure washer marketing revolves around features. Some genuinely improve your life. Others are there to fill a bullet list on the box. Here’s how we rate the most common ones.
Adjustable Pressure Control
A dial or switch on the gun or unit that lets you dial pressure up or down. Essential if you’ll be switching between a car (low pressure) and a driveway (high pressure) without swapping nozzles. Kärcher’s K Power Control models do this well, and most mid-range Nilfisks offer something similar. Worth the upgrade in our view.
Brass Pump Head / Aluminium Pump
Cheaper washers use plastic pump housings, which are fine for occasional use but can crack over time, especially if water is left inside during a frosty winter. Brass or aluminium pumps last far longer and usually signal a better-built machine overall. If you plan to keep it for ten-plus years, it’s money well spent.
Auto-Stop (Total Stop System)
This shuts the motor off the moment you release the trigger. Standard on almost every decent machine now, so you shouldn’t have to hunt for it. It saves electricity, reduces pump wear and makes the unit much quieter between jobs.
Hose Length and Quality
An 8-metre hose is a genuine upgrade over a 5-metre one. It means fewer repositions of the unit, less dragging across gravel and less risk of pulling the washer over. Some hoses are anti-kink, which sounds like marketing fluff but actually matters on a cold morning when a standard hose turns into a stubborn coil.
Integrated Detergent Tank
Handy if you clean cars often. The alternative is a detergent bottle that attaches to the lance, which works fine but is slower to swap out. Worth having, not a dealbreaker if missing.
On-board Storage
Lance holders, hose reels and accessory clips sound minor until the first time you trip over a coiled hose in the garage. Hose reels in particular save time and extend hose life.
Features You Can Skip
App connectivity, smart displays and Bluetooth are almost never worth paying for. You’re blasting muck off paving, not managing a smart home.
Top UK Pressure Washer Brands
UK gardeners have a fairly settled set of brands to pick from. Here’s what each one is known for.
| Brand | Sweet Spot | Good to Know |
| Kärcher | K2 to K7 domestic range | Widest UK availability, huge accessory range, easy spares, colour-coded K-series makes sizing simple |
| Nilfisk | Core and Premium ranges | Often edges Kärcher on raw bar/flow at similar price, strong build quality, slightly smaller accessory ecosystem |
| Bosch | EasyAquatak and UniversalAquatak | Great value, quiet operation, compact storage, Bosch Home & Garden accessories widely stocked at Screwfix and B&Q |
| STIHL | RE series | Premium-priced but built to last, strong at dealer network support, popular with smallholders |
| Makita | HW series | Good for tradespeople already in the Makita ecosystem, robust motors, less high-street presence |
| Own-brand (Titan, Wickes, etc.) | Entry level | Often a rebadged motor inside, cheap to buy but accessories and spares can be harder to source long-term |
Accessories That Actually Matter
A bare pressure washer comes with a standard lance, a couple of nozzles and a detergent bottle. That’s enough for basic car and patio cleaning, but a few accessories pay for themselves within the first weekend.
Patio Cleaner (T-Racer / Rotary Surface Cleaner)
If you have any amount of paving, buy one of these. It’s a flat disc with spinning jets that cleans evenly without stripping, leaving no tiger-stripe marks. Kärcher’s T-series and Nilfisk’s equivalents are both excellent. This single accessory transforms patio cleaning from a four-hour chore into a one-hour job.
Turbo (Rotary) Nozzle
Concentrates the jet into a spinning cone, roughly doubling effective cleaning power. Excellent for driveways and stubborn algae. Use with care — it can damage softwood, mortar and paintwork.
Long Lance Extension
Adds around one to two metres of reach, which is invaluable for gutters, conservatory roofs, bargeboards and tall walls. Pairs well with a gutter-cleaning attachment.
Variable Spray / 3-in-1 Nozzle
A convenient single nozzle that switches between detergent, low-pressure and high-pressure modes. Great for car wash days when you’re constantly flipping between functions.
Skip These (Usually)
- Drain-cleaning hose kits — useful but rarely used; buy only if you need one
- Brushes that clip onto the lance — often no better than a cheap detailing brush
- Generic third-party nozzles — stick with brand-matched parts for longevity
Pressure Washer Budget Guide
There’s a pressure washer for every budget, but the value really tops out around the £150–£250 mark. Below that, you compromise on hoses, connectors and longevity. Above that, you’re paying for power most UK homes won’t use.
| Budget | What You Get | Typical Models |
| Under £100 | Entry-level electrics, 100–120 bar, short hoses | Kärcher K2, Bosch EasyAquatak 120, Nilfisk C 110 |
| £100–£200 | Sweet spot for most UK homes, 130–140 bar | Bosch UniversalAquatak 135, Kärcher K4, Nilfisk Core 140 |
| £200–£400 | Premium domestic, water-cooled motors, longer hoses | Kärcher K5 and K7, Nilfisk Premium, Bosch AdvancedAquatak |
| £400+ / Petrol | Heavy-duty and petrol, 180 bar plus | STIHL RE series, Kärcher HD, Hyundai petrol units |
Common Mistakes to Avoid
- Buying the biggest machine you can afford: more bar on a patio that only needs 120 means damaged pointing and stripped paint.
- Ignoring hose length: a powerful unit with a 5-metre hose is exhausting to use on anything but a tiny patio.
- Forgetting water supply: most washers need a steady mains feed of around 450 l/hr at the tap. A slow outdoor tap will starve a big unit. Check before you buy.
- Cheap out on accessories: the machine matters less than the T-Racer. A £99 Kärcher K2 with a patio cleaner outperforms a £250 washer with a bare lance.
- Storing badly over winter: water left in a plastic pump can freeze and crack. Drain the unit, run it empty for a few seconds and store indoors from November to March.
Care and Maintenance
A pressure washer that’s been looked after will outlast one that’s been thrashed. There isn’t much to it, but there are three habits worth forming.
Clean the inlet filter after every major job. It’s usually a small mesh sieve where the garden hose connects to the unit. A minute with a soft brush stops grit from reaching the pump.
Drain the unit and run it dry for a few seconds before storing. Any water left inside can stagnate, harbour limescale or freeze in winter.
Descale every couple of years if you’re in a hard-water area (most of southern and eastern England). Purpose-made pressure washer descalers are cheap and take 20 minutes.
Final Verdict: How to Pick
If you only remember three things from this guide, make them these:
- Match the machine to the jobs. Write your cleaning list first, then buy.
- Flow rate matters as much as bar. Don’t chase the biggest number on the box.
- Budget for accessories. A mid-range washer with a patio cleaner beats a premium bare unit every time.
For most UK homes, a £150–£220 electric washer from Kärcher, Nilfisk or Bosch, paired with a T-Racer and an 8-metre hose, will handle everything you throw at it for a decade. Only step up to petrol or semi-pro kit if you have genuinely heavy-duty needs, and only step down to sub-£100 units if your list really is just the car and a few bins.
Whichever way you lean, choose a brand with a proper UK accessory range — because the machine you’ll still be using in 2035 is the one you can still buy spare nozzles and hoses for.
Related reading: our Best Pressure Washer UK 2026 round-up, the Best Budget Pressure Washer Under £150 UK guide, and our Kärcher vs Nilfisk head-to-head compare the top models across every budget band.