Steam
The specification that matters most is not pressure. It is whether you can refill the machine without waiting for it to cool.
Three specifications decide how a steam cleaner behaves. Pressure is only one of them.
A sealed boiler must depressurize and cool before it takes water — fifteen minutes, in the middle of a job. The Kärcher SC 3 refills like a kettle while working; the Polti Vaporetto machines use a separate cold tank feeding the boiler, which gives boiler pressure without the wait. Both arrangements beat a single sealed vessel.
Thirty seconds means the machine gets used on a hob before dinner. Six and a half minutes means it gets used when you have already decided to spend the morning cleaning. Neither is wrong — they suit different habits, and the price gap between them buys exactly that.
Three bar to five, across this comparison. Higher pressure means drier steam. More useful than the extra bar is an adjustable steam control, which is what makes one machine safe on sealed wood and glass as well as on tile grout.
Where steam loosens grease and grime in grout and around fittings without chemicals.
Where a steam cleaner with a floor head works, though a dedicated steam mop is easier for that one job.
Where small nozzles reach into places a cloth cannot, and where steam is genuinely better than scrubbing.
Where steam refreshes but does not extract, which is a different machine's job.
| What you clean | The machine | The caution |
|---|---|---|
| Grout and bathrooms | Cylinder with detail nozzles | Test on old grout |
| Hard floors only | A steam mop | Not for unsealed wood |
| Mixed household tasks | A cylinder machine | Refill and heat-up times |
| Upholstery | Steam refreshes only | Extraction is another machine |
Steam cleaners are destroyed by limescale, which builds inside the boiler where you cannot see it. A machine that takes longer to heat and spits water is descaling territory, and in hard water areas the schedule matters far more than people expect.
Steam burns worse than hot water.
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
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
3 bar · 3 min heat-up · 200 ml · 1.58 kg (3.5 lb)
A handheld for taps, tiles and hobs — and honest about the twenty square meters it covers.
Best for: Taps, sinks, wall tiles, mirrors, extractor hoods and hobs — detail work, not floors
5 bar · two-chamber boiler · unlimited runtime · 1,100 W
Five bar and a boiler that never has to stop — the domestic machine closest to a professional one.
Best for: Large houses, tiled floors throughout, or anyone cleaning several rooms in one session every week
Three bar cleans a bathroom; four to five gives drier steam, which does more on grout and grease and leaves less water behind. The difference is real and modest — accessory choice and dwell time matter more.
Limescale, not wear. It forms on the heating element, output falls gradually, and most owners blame the machine. Look up your water hardness, then either descale on the manual's schedule or buy a machine that takes a cartridge — and price the cartridges before choosing.
Steam at temperature reduces many surface contaminants, but the claim depends on temperature at the surface and contact time. Treat it as thorough cleaning rather than a guarantee.
Only on properly sealed floors, and even then with caution. On unsealed wood, heat and moisture lift and swell the boards.
Where the manual says so, yes. Limescale destroys boilers, and in hard water areas this is the difference between a machine that lasts and one that does not.
A mop is easier for floors alone; a cylinder machine with attachments does bathrooms, grout and detail work as well.
Often limescale, sometimes overfilling. Descaling on schedule prevents the first and reading the fill line prevents the second.
For a lot of household cleaning it does, which is the main reason people buy one. It takes more time and technique in exchange.
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: 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
Meant for: Taps, sinks, wall tiles, mirrors, extractor hoods and hobs — detail work, not floors
Where it is strongest: 1.58 kg (3.5 lb) — light enough to hold above your head against an extractor hood
Where it is weakest: 200 ml is roughly twenty square meters, then it stops
Meant for: Large houses, tiled floors throughout, or anyone cleaning several rooms in one session every week
Where it is strongest: 5 bar: the highest pressure in this group, and it shows on grout and grease
Where it is weakest: Costs roughly twice the Polti Smart 120 and three times a good steam mop
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.
