Which machine
One uses heat and a liter of water; the other uses several hundred liters an hour and mechanical force. They overlap far less than the shops suggest.
Both machines clean without detergent. That is where the similarity ends.
A steam cleaner boils a liter of water and delivers it as vapor at 3 to 5 bar. It softens grease, lifts grime from grout, and leaves the surface nearly dry. It works at centimeters, indoors, on tile, hobs, taps, screens and sealed floors. It does nothing useful to a terrace.
A pressure washer moves 400 to 600 liters an hour at 120 to 180 bar. It strips algae, dirt and old coatings from hard outdoor surfaces, and it will strip soft ones too. It is an outdoor machine, and it needs somewhere for the water to go.
Neither disinfects in the domestic sense unless you accept a manufacturer’s laboratory claim, and neither replaces a vacuum. Households that clean tile floors indoors and a drive outdoors need both — which is worth knowing before spending the whole budget on one.
Pressure washer territory entirely. Steam has neither the volume nor the reach for outdoor surfaces.
Steam territory. Heat loosens grease and grime in places pressure cannot be used.
Where both can work, and where a pressure washer at low setting is usually quicker.
Where steam's heat is the argument, and where the effect depends on temperature and contact time.
| The job | The machine | Why |
|---|---|---|
| Patio or drive | Pressure washer | Volume and force |
| Bathroom grout | Steam cleaner | Heat, no chemicals |
| A car | Pressure washer | Rinsing volume |
| Kitchen surfaces | Steam cleaner | Indoors, no runoff |
The two machines fail in completely different ways. Pressure washers die of frost and grit through the pump; steam cleaners die of limescale in the boiler. Neither problem affects the other machine, and both are preventable with a habit rather than a repair.
Different hazards from each.
3.5 bar · 30 s heat-up · 1 l refillable tank · 1,900 W
The one that refills like a kettle: thirty seconds to steam and no waiting for a boiler to cool.
Best for: Kitchens and bathrooms cleaned regularly, where the machine is picked up for twenty minutes at a time
130 bar · 420 l/h · 30 m (98 ft)²/h · 5.7 kg (12.6 lb)
The first Kärcher that publishes its flow rate — and the number that tells you what the machine will actually do.
Best for: A terrace, a drive and a car, cleaned two or three times a year, where the K 3 would need too many passes
4 bar · 2 min heat-up · removable 2 l tank · 1,500 W
Four bar and a two-liter removable tank: pressure from a boiler, refilling like a kettle.
Best for: Whole-house sessions — several rooms in a row, where pressure and a large water supply both matter
No. Steam carries very little water and no mechanical force to speak of; a terrace needs volume to carry the dirt away. Steam is for grout, hobs, taps, shower screens and sealed floors — indoor work at close range.
Only in a garage or utility room with a drain, and even then it makes a mess. The machines are designed to move hundreds of liters an hour, which has to go somewhere.
Not realistically. It produces far too little water to rinse an outdoor surface, and something has to carry the loosened dirt away.
No. The volume of water alone makes it impractical, and a jet damages interior surfaces easily.
They do different jobs. Steam loosens grease and grime with heat where you cannot use force; pressure moves dirt with volume where you can.
Steam, comfortably. That is its main argument, and it is a genuine one for interiors.
Many households end up with both because they solve different problems. Buy for the job you actually have first.
Steam at temperature reduces surface contamination, though it depends on temperature and contact time. Treat it as thorough cleaning rather than a guarantee.
Meant for: Kitchens and bathrooms cleaned regularly, where the machine is picked up for twenty minutes at a time
Where it is strongest: Refillable mid-session — no depressurizing, no cooling down, no fifteen-minute pause
Where it is weakest: 3.5 bar is modest against the 4 and 5 bar Polti machines
Meant for: A terrace, a drive and a car, cleaned two or three times a year, where the K 3 would need too many passes
Where it is strongest: 420 l/h is published, so the machine can be compared honestly against anything else that publishes a flow figure
Where it is weakest: 5.7 kg (12.6 lb) with no water in it: light, which also means it walks when you pull the hose
Meant for: Whole-house sessions — several rooms in a row, where pressure and a large water supply both matter
Where it is strongest: 4 bar — half a bar more than the top domestic Kärcher here
Where it is weakest: Two minutes to heat, against thirty seconds on the Kärcher SC 3 Deluxe
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.
Last checked on
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.
