Buy Giraffe Tools Grandfalls Essential if the job is always next to a sound wall and you want 30 m of hose that retracts on its own. It is a 125 bar rated wall box at £261. Buy a trolley K4 instead if you wash two sides of the house, you rent, or you already own yellow lances. A K4 on a shelf is storage. It is not a wall mounted jet wash.
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UK shops sell four useful versions of this phrase. A consumer retractable box (Grandfalls). A boxed washer on a bracket (SIP Tempest PW420/150). A detailing washer plus a steel mount (bigboi WashR). A trade stationary pump (Kärcher HD ST, Kränzle WS). Those last ones are workshop kit, not a home default. Reel-only shopping sits on the hose-reel page.
Quick picks
Best overall
Giraffe Tools Grandfalls Essential
£261
165 bar peak, 30 m auto-retract hose, all-in-one wall box. The hose-ready home unit most drives should start with.
Best compact
Giraffe Tools Grandfalls G20
From £207
150 bar, 20 m hose, 180° swivel bracket. Smaller box for a single car and a short side return.
Best boxed washer
SIP Tempest PW420/150
From £334
150 bar, 1.6 kW induction motor, hangs on a bracket or stands on the floor. The 6 m hose is the catch.
Best detailing bay
bigboi WashR PRO MKII
From £712 + £269 mount
130 bar peak, 13 m hose, quiet induction pump. A detailing washer you then bolt to the wall, not a retractable box.
Four meanings of the same search
| Model | Type | Pressure | Flow | Hose | Supply | Weight | UK price (Aug 2026) |
|---|---|---|---|---|---|---|---|
| Grandfalls Essential | Retractable wall box | 165 bar peak / 125 rated | 8.0 L/min max, 5.0 rated | 30 m, replaceable, auto-retract | 2 kW brush, 8.5 A, 240 V | 21.2 kg | £261 (was £290) |
| Grandfalls G20 | Compact retractable | 150 bar | 8.0 L/min max, 5.0 rated | 20 m, not replaceable | 1.8 kW, 7.5 A, 240 V | 18.2 kg | £207 to £218 |
| SIP PW420/150 (08920) | Boxed washer + bracket | 150 bar | 420 L/h | 6 m, no reel | 1.6 kW induction, 13 A | 12.8 kg | £334 to £380 |
| WashR PRO MKII + mount | Detailing washer + shelf | 130 bar max / ~100 tuned | 9.5 L/min max, 9.2 tuned | 13 m, manual reel | 2 kW peak induction, 13 A | 28 kg carton | £712 to £749 + £269 |
| Kärcher HD 7/12-4 M ST | Trade stationary pump | 120 bar (180 max) | 700 L/h | Sold separately | 3.1 kW, 240 V | 25 to 28 kg | £1,362, no accessories |
Prices checked August 2026. Giraffe Tools was in a summer sale when we last dated the ticket. Confirm the live total. Walk the job before you buy 30 m you will never pull out.
Giraffe Tools Grandfalls Essential
- Buy: Giraffe Tools Essential £261 (was £290)
- Part number: P115-G30BUK
- Pressure / flow: 165 bar at first discharge, 125 bar rated. 8.0 L/min max, 5.0 rated
- Hose: 30 m replaceable, auto-retract
- Motor / cable / weight: 2 kW brush motor, 5 m cable, 21.2 kg
- In the box: wall box, wall base, foam pot, gun and nozzle, 2 m lead-in hose, fasteners, tap adaptor
This is the product people mean. Mount it, clip the garden hose to the 2 m lead-in, plug into a 13A outdoor socket, and pull. Treat 165 as the peak. A fan jet at 125 bar sits with a K4 for cars. Use the foam pot. The motor is a brush unit, cheaper and louder than the SIP. Total Stop cuts it when you drop the trigger. IPX5 allows an outdoor wall. Take it down for winter. The hose is replaceable on Essential. That is why you skip the G20 if you will use this every week.
Giraffe Tools Grandfalls G20
- Buy: Giraffe Tools G20 from £207 · Amazon
- Models: P115-G20B / P115-G20A
- Pressure / hose: 150 bar max, 20 m, not replaceable
- Motor / cable / weight: 1.8 kW, 2 m lead, 18.2 kg
Essential, shrunk, with a 180° swivel. For one hatchback on a short drive that is enough. Twenty metres is not thirty. The 2 m power lead means the socket has to be close. 95 dB is loud on a terrace. Skip it if the patio is around the back and the only solid wall is on the drive.
SIP Tempest PW420/150
- Buy: Kendal Tools £333.99 · First for DIY £348.80 · Generators Direct £379.99 · SIP UK (no live list on the page)
- Code: 08920
- Pressure / flow: 150 bar, 420 L/h
- Hose: 6 m, no reel
- Motor: 1.6 kW brushless induction, Total Stop, 13 A, 5 m cable
- Weight: 12.8 kg
This is a framed washer with a detachable bracket, not a hose-reel cupboard. Hang it, or stand it on the feet. You get a 13A plug and an induction motor in the same useful class as a K4. The 6 m hose is why it is not the default home pick. It will wash a car if the machine sits next to the door. It will not reach a rear patio from a front garage. Add a hose, or lift the frame off and walk it. That, not the hose, is what £334 to £380 buys: a UK industrial brand and a motor you can service.
bigboi WashR PRO MKII
- Buy washer: iBigBoi UK £711.55 (was £749). My Car Cleaning £735
- Buy mount: WASHR Fixed Wall Mount £269. The mount does not include the washer, hose, gun or nozzles
- Pressure / flow: 130 bar max, about 100 bar tuned. 9.5 L/min max, 9.2 tuned
- Hose: 13 m commercial braided. The wall reel takes up to 20 m of 1/4 inch hose
- Motor: 2000 W peak induction, Total Stop, under 80 dB
This is not a retractable consumer box. The WashR is a squat detailing washer. The wall kit is a powder-coated shelf, a manual reel, holders and masonry bolts. Together they make a bay. Apart, you have a 28 kg washer on the floor. If you only wash one family car, Essential at £261 is the rational wall unit. If you want a serviceable triplex and a short gun, this is the UK-stocked bay. Stock was incoming when prices were last dated. Do not treat a pre-order as next-day.
Trade pumps and shelves
The HD 7/12-4 M ST is a 3.1 kW 240 V wall pump at about £1,362 including VAT, with no hose, gun or lance in the box. The 110 V HD 6/11-4 M ST is site voltage. The only 230 V Kränzle wall unit we have dated is the WS 599 TS, about £2,457, on a 16 A plug. None of these belong on a domestic shortlist. Kärcher’s HR 4 is a garden hose reel. You can leave a K4 in the garage and put a high-pressure reel on the wall. That is a workaround, not a Grandfalls.
Grandfalls, SIP and the WashR are 13A UK plugs on an RCD. Mount on sound masonry. Drain the hose after use. Take a Grandfalls box inside for winter. Grandfalls quotes 90 to 95 dB. SIP’s sound-power figure is 84 dB(A). bigboi claims under 80 dB. A crumbling outhouse wall is a bad idea. If you have no outdoor socket, a wall unit is the wrong category. Use the cordless guide, or run a proper outdoor supply first. First-use sits on how to use a pressure washer.
FAQ
What is a wall mounted jet wash?
A pressure washer built to live on a wall, with the hose ready to pull, rather than a trolley you fetch from the shed. In the UK that usually means a retractable Grandfalls box, a SIP on a bracket, or a detailing machine on a purpose-made mount.
Is a wall unit better than a Kärcher K4?
Better at living in one place. Worse at going to the front path, the back lawn and a neighbour’s house. A K4 Power Control Flex, £169, is still the better first machine if you need to move it.
Will it run on a normal 13 A socket?
Grandfalls, the SIP PW420/150 and the WashR PRO MKII will. Use an RCD-protected outdoor socket. Trade ST and WS machines need a dedicated supply.
Can I mount it on an outside wall?
Yes, if the wall is sound and you plan for rain and frost. Giraffe Tools allows outdoor mounting and tells you to bring the unit in for winter. A bare pump on a north-facing wall through January is how you buy a new pump.
How long a hose do I need?
Walk it. Under 10 m: SIP or a trolley. Around 13 m in a bay: WashR. 20 m for a short drive: G20. 30 m for a house that turns a corner: Essential.
Can I wash a car with a wall mounted jet wash?
Yes. Use the foam bottle, a wide fan, and stay back from the paint. The same rules as the cars guide apply.