Cordless pressure washers have made genuine strides in 2026. Battery technology improvements mean the latest models can deliver useful cleaning pressure without a mains cable trailing across a wet patio. For UK homeowners who want to clean decking, garden furniture, cars, or wheelie bins without wrestling with extension leads, the cordless category now offers real answers.
This guide covers four of the strongest cordless pressure washers available to UK buyers, from the accessible Karcher K2 to the more powerful EGO HPW2100. We include a comparison table, individual verdicts, pros and cons, a buying guide, and a FAQ.
Quick Comparison Table
| Model | Max Pressure | Flow Rate | Battery | Runtime | Price Range | Best For |
|---|---|---|---|---|---|---|
| Karcher K2 Cordless | 30 bar | 130 L/hr | 18V | 20–30 min | £120–£160 | Light cleaning, portability |
| Greenworks 40V | 60 bar | 130 L/hr | 40V | 25–35 min | £150–£200 | General garden use |
| EGO HPW2100 | 62 bar | 150 L/hr | 56V | 30–45 min | £250–£320 | Heavy-duty cleaning |
| Ryobi RY18PW22A | 50 bar | 120 L/hr | 18V ONE+ | 20–30 min | £100–£150 | Ryobi platform users |
A Note on Cordless Pressure Washer Expectations
Before diving into the models, it is worth setting expectations. Even the most powerful cordless pressure washer on this list produces around 60–62 bar of pressure. Mains-powered pressure washers in the same price bracket reach 100–140 bar. For stripping moss from a driveway or cleaning heavily soiled surfaces, a mains-powered unit still has a clear advantage.
Where cordless excels is convenience: grab it, fill the water tank or connect to a bucket, and work anywhere. For patios, garden furniture, bikes, and cars, 50–60 bar is sufficient and the freedom from cables is a genuine quality-of-life improvement.
1. EGO HPW2100 — Best Overall Cordless Pressure Washer
The EGO HPW2100 is the strongest cordless pressure washer in the UK market for 2026. Running on EGO’s 56V ARC lithium platform, it achieves 62 bar of pressure — the highest on this list — and a flow rate of 150 litres per hour.
The HPW2100 supports both bucket feed and standard garden hose connection, which gives it genuine flexibility for locations without a tap nearby. A 0.5-litre onboard detergent tank allows soap application without switching attachments. The rotating nozzle, 25° spray fan, and foam cannon attachment cover most cleaning tasks.
Build quality is excellent. The unit is upright with a fold-down handle and wheels, making it easy to move around. At 5.8 kg (without battery) it is manageable for most users.
Pros:
- Highest pressure (62 bar) and flow rate (150 L/hr) in this comparison
- Versatile — bucket feed or hose connection
- Onboard detergent tank
- Part of EGO’s 56V ecosystem (cross-compatible with CS1800E chainsaw, mowers, etc.)
- Strong build quality and ergonomic design
Cons:
- Premium price
- Battery sold separately in some bundles — verify what is included
- Heavier than smaller cordless models
- Still outperformed by mains-powered units for heavy moss or driveway cleaning
Verdict: The EGO HPW2100 is the definitive cordless pressure washer for UK buyers who want the most performance available without a mains cable.
[AFFILIATE LINK: EGO HPW2100] — Check latest UK price
2. Greenworks 40V Pressure Washer — Best Mid-Range Pick
The Greenworks 40V delivers 60 bar of pressure and sits comfortably between the Ryobi’s value positioning and EGO’s premium price. It uses the same 40V platform as Greenworks’ chainsaw and mower range, so if you already own a Greenworks tool, the battery is cross-compatible.
The unit connects to a standard garden hose as its primary water source, with an optional bucket adapter. It is lighter than the EGO at 4.4 kg and the upright format is easy to store.
Runtime of 25–35 minutes on a 2Ah battery handles most medium-sized cleaning sessions — a car and a garden furniture set, or a patio of around 20 square metres.
Pros:
- Good pressure (60 bar) at a reasonable price
- 40V platform cross-compatible with other Greenworks tools
- Lighter than EGO at 4.4 kg
- Inline water filter protects the pump
- Adjustable lance included
Cons:
- Hose connection only (no bucket adapter included as standard)
- Shorter runtime than EGO
- Less powerful motor than 56V alternatives
Verdict: Solid value for existing Greenworks users or buyers wanting capable cordless performance without the EGO price tag.
[AFFILIATE LINK: Greenworks 40V Pressure Washer] — Check latest UK price
3. Ryobi RY18PW22A — Best for Ryobi ONE+ Platform Users
The Ryobi RY18PW22A is part of Ryobi’s ONE+ 18V system — one of the most widely adopted battery platforms in UK DIY. If you own a Ryobi drill, circular saw, or any other ONE+ tool, your existing batteries work directly.
At 50 bar it is less powerful than the EGO or Greenworks, but for light cleaning tasks — car washing, patio furniture, bikes, and garden tools — it is entirely adequate. The compact format and relatively low price make it an accessible entry point.
The unit supports bucket feed, which is a genuine advantage over the Greenworks for off-grid use. A 1-litre detergent tank is built in.
Pros:
- Compatible with Ryobi ONE+ 18V batteries (the largest DIY battery ecosystem in the UK)
- Bucket feed supported — works anywhere
- Onboard detergent tank
- Compact and lightweight
- Good entry-level price
Cons:
- 50 bar limits it to lighter cleaning tasks
- 18V platform means less power than 40V or 56V alternatives
- Shorter runtime on smaller batteries
Verdict: The obvious choice for Ryobi ONE+ tool owners. For non-Ryobi buyers, the Greenworks or EGO offers better performance.
[AFFILIATE LINK: Ryobi RY18PW22A] — Check latest UK price
4. Karcher K2 Cordless — Best for Portability and Occasional Use
Karcher’s brand recognition in pressure washers is unmatched, and the K2 Cordless brings that reputation to the battery category. At 30 bar it is the least powerful model on this list, but its compact size, ease of use, and Karcher’s accessory ecosystem make it a worthy entry.
The K2 Cordless runs on Karcher’s 18V battery and draws water from a bucket — no hose connection required. This makes it the most portable option here, useful for cleaning away from garden taps or taking in a campervan or on a boat.
At £120–£160 it is accessible for buyers who want occasional light cleaning without committing to a premium system.
Pros:
- Very compact and lightweight
- Bucket feed — fully portable
- Karcher brand reliability and accessory range
- Simple, no-fuss operation
- Low price
Cons:
- 30 bar is limited — unsuitable for heavy duty tasks
- Karcher 18V battery platform is less widely adopted than Ryobi ONE+
- Shorter runtime
- Not suitable for driveway or heavy moss cleaning
Verdict: Best for occasional, light cleaning where portability is the priority. Not the right tool for regular heavy work.
[AFFILIATE LINK: Karcher K2 Cordless] — Check latest UK price
Buying Guide
Pressure (bar) — What Do You Actually Need?
- Light cleaning (car washing, garden furniture, bikes): 30–50 bar is sufficient
- General patio and decking cleaning: 50–60 bar is recommended
- Driveway, heavy moss, or concrete cleaning: Consider a mains-powered unit; cordless 60 bar is marginal for this
Battery Platform
Cross-compatibility with existing tools significantly improves value. Ryobi ONE+ is the broadest 18V platform in UK DIY. EGO 56V and Greenworks 40V cover the higher-voltage garden tool segment.
Water Source
Most cordless pressure washers support hose connection, bucket feed, or both. Bucket feed is essential if you plan to use the washer away from a garden tap. Verify before purchase.
Flow Rate
Flow rate (litres per hour) affects how quickly you can cover surface area. Higher flow rate finishes jobs faster but depletes the battery sooner. The EGO’s 150 L/hr is notably higher than competitors.
Weight
Cordless units range from 3.5 to 6 kg without battery. For prolonged overhead use or carrying distances, lighter is better.
FAQ
Can a cordless pressure washer clean a driveway? It depends on the condition of the driveway and the model. At 60 bar, the EGO and Greenworks can tackle light to moderate soiling on drives. For heavy moss, lichen, or embedded grime, a mains-powered pressure washer at 100+ bar is more effective.
How long does a cordless pressure washer battery last? Most models deliver 20–45 minutes of active use per charge depending on battery capacity and pressure setting. Using lower pressure settings extends runtime considerably.
Can I use a cordless pressure washer to clean my car safely? Yes. At 30–50 bar, cordless models are well-suited to car washing. Avoid directing the jet at seals, door edges, or electronic components at close range.
Do I need a hose or can I use a bucket? It depends on the model. The Ryobi and Karcher K2 both support bucket feed. The Greenworks requires a hose. Check the specification carefully.
Are cordless pressure washers suitable for year-round UK use? Most models specify a minimum operating temperature of 0°C. In practice, avoid using any pressure washer in freezing conditions, as water in the pump can damage internal components.
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