In general, the best handheld steam cleaners are 2-in-1 machines: a small hand unit that clicks into a steam mop. They heat up in only 15 to 30 seconds, weigh 2 to 4 kg as a mop and much less in the hand, and hold 300 to 500 ml of water. That gives about 15 to 20 minutes of steam, enough for a kitchen, a bathroom or a quick round of the hall.
The best handheld models make steam on demand without a pressurised boiler, so the steam is gentler, at about 100 °C. That suits sinks, taps, hobs, grout and windows better than thick baked-on grease. They draw 1,300–1,600 W and have a 6–8 m cable, a flexible extension hose and 11 to 19 tools, such as a jet nozzle, small brushes, a window squeegee and a fabric hood for upholstery and clothes. Machine-washable microfibre pads and a parking stand keep them clean and tidy.