Pressure washers are one of those tools UK adults overspend on. The £400 contractor-grade Karcher gets used three times a year, then sits in the shed. A £120 K3 cleans the same patio in roughly the same time and lasts ten years if you actually rinse it out after use.
I've used a basic Karcher K2 for eight years on a small terrace garden. Replaced one trigger gun and a hose. That's it.
Pick by what you actually wash
| Use | Pick |
|---|---|
| Small patio, occasional car wash | Karcher K2 (£90-£120) |
| Average semi-detached patio + driveway | Karcher K4 (£170-£220) |
| Large drive, decking, regular use | Karcher K5 / Nilfisk Premium 180 (£280-£350) |
| Car only, rented flat | Nilfisk C-PG 130 (£100-£140) |
| Tight budget | Bosch UniversalAquatak 135 (£100-£140) |
For a typical semi-detached with a small drive: Karcher K4 at £180 is the right answer. It does everything most people need and is widely stocked at B&Q, Argos, and Wickes.
Karcher dominates the UK market
Karcher has roughly 50% UK market share in pressure washers. They're not the only good brand, Nilfisk is genuinely competitive, Bosch is solid budget, but Karcher's accessory range and replacement parts make them practical for the long term.
Karcher K2 (£80-£120): Entry tier. Good for cars, bikes, garden furniture. Underpowered for moss-covered patios.
Karcher K3 (£120-£170): The sweet spot for small gardens. Patio cleaner attachment included on most variants.
Karcher K4 (£170-£220): Where most households should land. Induction motor (longer life than universal), water-cooled, decent flow rate.
Karcher K5/K7 (£280-£500): Diminishing returns for domestic use. K5 worth it if you have a long drive and use it monthly. K7 is genuine overkill unless you're cleaning a patio business.
Nilfisk if you don't want Karcher
Nilfisk Premium series machines compete directly with Karcher K4-K5 at slightly lower prices. Quality is comparable. The downside: harder to find replacement parts in shops, mostly online.
For UK adults who'd rather not buy what everyone else buys: Nilfisk Premium 180 at £270-£320 is the Karcher K5 alternative.
What attachments actually matter
Most pressure washer kits ship with three or four attachments. In practice, two get used:
- Patio cleaner attachment (round disc with rotating jets). Genuinely transformative for patios, turns a 2-hour job into 20 minutes. Worth the extra £30 if not included.
- Variable spray lance. Replaces the rotary nozzle most kits ship with. Easier to control flow.
Skip:
- Foam cannon (use a spray bottle for car wash; foam cannon is novelty)
- Brush attachment (slower than just using a sponge)
- Telescopic lance (rarely needed for domestic use)
The Karcher mistake people make
If your pressure washer hisses, leaks at the trigger, or won't start after winter, it's almost always one of two things: the inlet filter is blocked with grit (rinse it), or you stored it with water in the pump and it froze (refill, run for 30 seconds, see if pump primes).
Don't take it to be repaired before checking those. Pressure washer "repairs" are typically £80-£150; the actual fix is usually free.
Storage matters more than people think
Pressure washers fail because of three things, in order:
- Frost damage (water left in pump over winter)
- Pump seal degradation (UV, age)
- Trigger gun internal seals failing
Keep it in a frost-free shed or garage. Drain it before October. That's most of long-term reliability.
When you actually need a contractor machine
For the few UK adults who genuinely need more than a K5: petrol pressure washers (£500-£1,500) for off-grid use, or hot-water pressure washers (£600-£2,500) for oil/grease cleaning. Both are commercial kit. Most domestic use doesn't justify either.
Hire vs buy
If you'll use a pressure washer once a year for a spring patio clean: HSS Hire or local tool hire shops rent pressure washers at £25-£40/day. For a single weekend, that's cheaper than buying. For two weekends a year over five years, buying wins.
Buying becomes the right answer at three+ uses per year.
Related kit
A pressure washer pairs with a few things that make life easier:
- Outdoor tap with hose connector (£30-£60 if you don't have one already)
- Long enough hose to reach the furthest corner (extension hoses £20-£40)
- Patio cleaner if not included with the unit
You don't need a generator, drainage mat, or special detergent for normal domestic use.
Affiliate disclosure: Morningfold has affiliate partnerships with Karcher, Nilfisk, Bosch, and major UK tool retailers. See editorial standards.