Boiler pressure against instant readiness
More pressure, or less waiting?
Both solve the classic boiler problem, in opposite ways: Polti separates the tank from the boiler, Kärcher does away with the pressurised wait entirely.
| Compared on | Vaporetto Smart 120 | SC 3 Deluxe |
|---|---|---|
| Steam pressure | 4 bar | 3.5 bar |
| Heat-up time | 2 minutes | 30 seconds |
| Tank | 2 l, removable | 1 l, refillable in use |
| Adjustable steam | Yes | Not stated |
| Accessories | 11 tools, 3 cloths | Floor kit, hand and detail nozzles, brushes |
| US availability | Absent | Sold |
| Listed on amazon.com | No | Yes |
A tick marks the better answer on that line only. Counting ticks does not decide the page — the two verdicts below do, because these machines answer different questions.
No amazon.com listing was found for this one. We hold references for other markets but none for the United States, so it may not be buyable here — which is the first thing to weigh against anything below.
Prefer the Polti for whole-house sessions: more pressure, twice the water, and a steam dial that lets one machine handle grout and sealed wood.
Buy the Kärcher if the machine will be picked up for ten minutes at a time. Thirty seconds is what makes that happen.
Laminate joints, sealed wood, glass and fabric. A single-setting machine is tuned for its hardest job — grout — and that is exactly the wrong amount of water for a wood floor.
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
3.5 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
