Heated throw blankets: real running costs, safety, and what actually matters
A heated throw is winter's most cost-effective object: it heats the person, not the room. But between models you can't wash, models that never switch off and fantasy wattage claims, there's sorting to do. Here's what actually matters.
Running costs: pennies per evening
A heated throw typically draws around 100 W — at €0.25/kWh, that's about €0.025 per hour, or 8 cents for a 3-hour evening. A month of daily use costs under €2.50. That's 10 to 15 times less than a space heater, because the heat goes straight onto you instead of warming the air.
The obvious trade that follows: turn the living-room thermostat down 2 degrees and settle under a heated throw — one of winter's best comfort-per-euro moves.
Safety: the two non-negotiable features
Auto shut-off first: a good throw switches itself off after a set time (typically 3 hours). That's what makes dozing off under it a non-event. A model without auto shut-off doesn't belong on a sofa.
Overheat protection second: the heating element must cut out if any spot runs abnormally hot (a folded blanket, for instance). Serious products use a dual sensor (PTC + NTC) for this.
And the basics: a 220–240 V EU plug and a CE marking backed by a real certificate — for heated blankets the applicable standard is EN 60335-2-17. A printed CE logo with no certificate behind it protects nobody.
Machine washable: the criterion that settles everything
A throw lives on a sofa: it will collect coffee, crumbs and cat hair. If it can't go in the machine, it ends up balled in a cupboard before February.
The mechanism to check: a detachable controller. Unplug the control unit and the fabric goes into a 30 °C wash, gentle spin, no dryer. If the product page doesn't clearly mention a detachable controller, treat the blanket as not washable.
Size and fabric: what changes the comfort
130 × 180 cm is the right sofa standard: big enough to cover you from feet to shoulders, compact enough to stay a throw rather than a bed blanket. Below 120 cm wide, you spend the evening re-tucking your legs.
On fabric: double-sided flannel (or flannel + sherpa) holds heat far better between heating cycles than thin fleece — the throw stays warm even switched off, which lets you heat intermittently and spend even less.