Which type of steam cleaner is right for me?
By use: for mainly floors, an upright steam mop is the quickest and handiest. For detail cleaning (taps, grout, windows, upholstery), a handheld steam cleaner is enough. For the whole house with lots of accessories, a Kärcher canister unit is the most flexible, and anyone who wants to combine floor and handheld takes a 2-in-1 appliance.
Does a steam cleaner really clean without chemicals and hygienically?
Yes. Hot steam (up to 3.5 bar on the Kärcher units) loosens grease, dirt and limescale and removes a large share of common household bacteria, with no cleaning agent at all. That is particularly useful in the kitchen and bathroom and in households with children, pets or allergies. For heavily dried-on crusts, letting it work briefly or a second pass helps.
On which floors can I use a steam cleaner?
Only on sealed hard floors: tiles, stone, sealed parquet, laminate and vinyl. Unsealed wood, oiled parquet, cork and delicate coverings can be damaged by heat and moisture. Appliances such as the Leifheit CleanTenso or the Black+Decker are explicitly meant for sealed floors. If in doubt, try it on an inconspicuous spot first.
How important are heat-up time and tank size?
Both decide the comfort. The heat-up time ranges from 30 seconds (Kärcher SC 3, steam mop) to 6.5 minutes (Kärcher SC 2). The tank size determines how long you can work in one go: 250 ml (about 8 min) for the cheap Clatronic, 450 ml for the Eave, 1 litre for the Kärchers. If you want to mop through without a break, look for a large tank or non-stop refilling.
Is an expensive Kärcher worth it compared with a cheap handheld unit?
It depends on the use. A handheld unit from €30 is enough for occasional detail cleaning in the bathroom and kitchen. If you steam-clean regularly and throughout the house (floors, upholstery, taps), a Kärcher SC 2 gives you more steam pressure, better accessories and more stamina. Rule of thumb: occasional and details → handheld unit; frequent and whole house → canister unit or steam mop.