Terraces
Most damaged terraces were cleaned with the right machine and the wrong nozzle. Here is the kit, in the order it matters.
Three items, and one to leave in the box.
For a terrace of any size, flow rate decides the finishing time. The Kärcher K 5 publishes 500 l/h; the K 7 WCM 600 l/h with a water-cooled motor for long sessions. Pressure above about 150 bar buys nothing here except the ability to damage stone faster.
The single most important purchase. It holds the jets at a fixed height, keeps the spray off the wall, and removes the striping a hand-held lance leaves. The T-Racer T 5 adds adjustable jet height, which is what protects soft stone and timber. The PS 30 Plus handles the steps and edges the wide head cannot reach.
Applied low, left to dwell, rinsed low. Dwell time does what pressure cannot.
The rotary nozzle, unless the surface is concrete. Two seconds of hesitation leaves a line in a paving slab that stays for years.
The main case, and one where working in sections and rinsing as you go avoids drying marks.
Where a treatment and time do far more than pressure, and where pressure alone often just moves it.
Where a thorough clean and full drying are both required before anything is applied.
Where a soft-wash approach with a detergent and a brush is safer than any machine setting.
| Your terrace | The approach | The risk |
|---|---|---|
| Concrete paving | Surface cleaner | Blowing out joint sand |
| Natural soft stone | Low pressure and detergent | Marking and etching |
| Porcelain | Gentle rinse and detergent | Very little |
| Anything with moss | A treatment and time | Pressure alone regrows |
A terrace cleaned every year needs less force each time, and one left for a decade takes damage during the recovery. Jointing sand and any sealer are consumables that get removed alongside the dirt, and replacing them is part of the job rather than an afterthought.
Wet surfaces, pressure and chemicals.
145 bar · 500 l/h · 40 m (131 ft)²/h · 6.3 kg (13.9 lb)
Five hundred liters an hour and a fixed handle: the point in the range where the machine stops being carried and starts being wheeled.
Best for: A long drive, a large terrace or several vehicles — where flow rate, not pressure, sets the finishing time
Two rotating flat jets · adjustable height · splash guard and bristle ring
Two flat jets under a hood, with adjustable distance to the surface — the difference between clean and scarred.
Best for: Kärcher owners with a terrace, a drive or a patio of any size
≈ $150
180 bar · 600 l/h · 60 m (197 ft)²/h · water-cooled motor
The top of the domestic range, and the only one here whose motor is water-cooled — which is a statement about running time, not power.
Best for: Large areas cleaned in one session — long drives, farmyards, several vehicles — where the machine runs continuously rather than in bursts
Three jets and a bristle ring · swivelling side nozzle · 360° head
A surface cleaner for the places a T-Racer cannot go — steps, edges and small areas.
Best for: Steps, thresholds, edges, small courtyards and vertical surfaces
Because the distance and angle between the nozzle and the stone change constantly with your arm. A surface cleaner holds both fixed and passes at a steady rate, so every square centimeter receives the same energy. That is what produces an even finish rather than a record of your technique.
Time, not pressure. A stone and facade treatment applied at low pressure and left for the stated period does what no nozzle can, because the growth is rooted in the surface. Rinse afterwards at low pressure — and keep the product away from planting beds and ponds.
It can, particularly soft natural stone and jointing sand. Testing in a hidden corner first is what tells you before the whole terrace does.
Work across joints rather than along them, keep the lance further back, and expect to re-sand paving afterwards regardless.
No. It removes the visible growth and leaves the roots. A treatment with dwell time is what delays its return.
If the surface was sealed before, cleaning will have removed some of it. Any sealer needs a completely dry surface, which takes longer than it looks.
Usually a hand-held lance rather than a surface cleaner, or detergent drying in the sun. Working in sections in the shade fixes both.
Into drains, soil and onto plants. Wetting nearby plants before and after dilutes what reaches them.
Meant for: A long drive, a large terrace or several vehicles — where flow rate, not pressure, sets the finishing time
Where it is strongest: 500 l/h — a fifth more water than the K 4, which is where the time saving comes from
Where it is weakest: No surface cleaner in this version, unlike the Home bundles
Meant for: Kärcher owners with a terrace, a drive or a patio of any size
Where it is strongest: Adjustable jet height — the single control that protects a soft surface
Where it is weakest: Kärcher fitting only: it will not go on a Bosch or Nilfisk machine
Meant for: Large areas cleaned in one session — long drives, farmyards, several vehicles — where the machine runs continuously rather than in bursts
Where it is strongest: Water-cooled motor: the specification that separates an occasional machine from one that runs for an hour
Where it is weakest: 180 bar will strip softwood, render and old paint if the nozzle is held close
Meant for: Steps, thresholds, edges, small courtyards and vertical surfaces
Where it is strongest: The swivelling side nozzle cleans right up to a riser or a wall
Where it is weakest: Small working width: it is not the tool for a large terrace
$26 – $40
5 models
$40 – $90
5 models
$105 – $490
5 models
Lances, nozzles and detergents from the same aisle, at the price we read. Confirm the fit against the machine you choose before ordering: it turns on the coupling and the part number, which the listing gives.
Comparisons we have already run between two washers from this guide or this aisle.
The washers above come from the catalog of this site. Specifications are those the manufacturer and the Amazon page publish; prices are what Keepa reported for the date below, and both move. The order follows declared specifications, stated strengths weighed against stated limits, and price. No machine here has been put to work by us, and nothing on this page pretends otherwise.
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Prices quoted in these summaries are dated readings. The live price is shown next to each product.
Pressure washers and floor washers swing by a hundred dollars or more across the year, and the biggest "discounts" often land at prices the same model sold for six weeks earlier. UniverTrack tracks the real price history across retailers, spots fake reductions, and alerts you when it is genuinely the moment to buy.
