How to wash a heated blanket

The sequence

1. 1Unplug it from the wall and let it cool completely. A warm blanket going into water is a bad start and the fabric handles better cold.
2. 2Detach the controller and the power cord. On most modern blankets this is a plug at one corner of the hem; on some it is a two-part cord that separates in the middle. Both parts come off. This is the step that matters most.
3. 3Check it over while it is flat. You are about to put stress on it, so this is the natural moment to look for scorching, kinks or cord damage. If you find any, it goes in the bin rather than the machine.
4. 4Pre-soak briefly if it needs it. Ten to fifteen minutes in cool water with a mild detergent. Not required, and useful for a throw that has lived on a sofa.
5. 5Wash on gentle or delicate, cool or lukewarm water, mild detergent, slow spin. Sealy specifies slow agitation and low spin speed by name, and that guidance is sound for all of them.
6. 6Do not wring it out. Twisting is what cracks element insulation. If it is heavy with water, press it against the side of the drum or lay it flat and roll it in a towel.
7. 7Dry it low and slow. A short tumble on low to shed most of the water, then finish flat or on a line. Reshape it while damp so it dries in its proper dimensions.
8. 8Confirm it is completely dry before reconnecting anything. Every maker in our set is explicit that the blanket must not be used damp. Give it longer than you think, particularly at the hems.

The rule that breaks blankets

Step two. It is on every listing and in every manual, and it is still the single most common way a heated blanket is destroyed.

The controller is an electronic module. It does not survive immersion, and unlike the element it fails immediately and obviously. The blanket itself is often fine afterwards, which is the frustrating part: you have destroyed the one component that cannot be replaced separately.

The dryer question

This is where manufacturers actually disagree, and where generic advice is least useful.

The pattern across all of them: a short low-heat tumble to remove most of the water, then finish flat or on a line. Nobody in our set endorses drying a heated blanket to completion on high heat, and the reason is that heat plus tumbling plus a wire mesh is the combination most likely to kink an element.

How often

Less often than sheets, and this is the genuine tension in the category. Washability is the headline feature on every listing, and washing is one of the two things that shortens a heated blanket's life. The other is hard folding for storage.

• A bed blanket above the top sheet: two or three times a season. It is not against your skin.
• A throw that lives on a sofa: more often, because it gets sat on, but every wash is a cost against its lifespan.
• A mattress pad under a fitted sheet: rarely, unless something is spilled. The fitted sheet is doing the work. If spills are likely, a waterproof pad is the better answer than frequent washing.

What not to do, and why

• No dry cleaning. The solvents attack the insulation on the element. Sealy prohibits it by name and it applies generally.
• No bleach. Same reason.
• No wringing or twisting. Mechanical stress on the wire is what cracks insulation, and the damage is invisible afterwards.
• No ironing. Direct heat on an element is an obviously bad idea and it is worth stating because people do it to throws.
• Never use it damp. The one rule with no exceptions anywhere in our set.

Brand-specific instructions where people search for them most: washing a Sunbeam blanket and washing a Bedsure blanket.