Frequently asked questions

Questions people actually ask

How much does an electric blanket cost to run per night?

About 15 cents for an eight-hour night at 100 W, and about 32 cents at 220 W with both sides of a dual-control blanket running, at the US average residential rate of $0.1834 per kWh. Full arithmetic on cost per night.

How much does an electric blanket cost per month?

At 100 W and eight hours a night, thirty nights is 24 kWh, about $4.40. At 220 W it is about $9.68. A 120-night winter is roughly $17.61 to $38.74. See cost per month.

Do electric blankets use a lot of electricity?

No. Published draws run 100 to 220 W, about the same as ten LED bulbs and one fifteenth of a 1,500 W space heater. The full comparison.

Is an electric blanket cheaper than a space heater?

Dramatically. A 100 W blanket for eight hours is 0.8 kWh, about 15 cents. A 1,500 W space heater for the same eight hours is 12 kWh, about $2.20. Fifteen times the cost. Worked out in full.

How do I work out what my own blanket costs?

Watts divided by 1000, times hours, times the per-kWh rate on your own bill. The hard part is the wattage, because most makers do not publish one. How to find it.

How many watts does an electric blanket use?

Of the models that publish a figure: 100 W (Westinghouse queen, both Bedsure throws), 130 W (Bedsure full), 200 W (Bedsure mattress pad) and 220 W (Bedsure dual-control queen and king). Only 8 of 29 products we track publish anything. The full ledger.

Why do some sites say electric blankets use 400 watts?

One widely cited calculator publishes a single 400 W figure for every blanket at every size, with no source. It is inconsistent with every manufacturer figure we could find, all of which fall between 100 W and 220 W.

How can I find out my blanket's wattage if it is not published?

Check for a rating label on the controller, the plug or a sewn-in tag first, since that is the maker's own figure. Failing that, a plug-in energy monitor of the kind sold for about $20 reads the actual draw directly.

Are electric blankets safe?

A modern blanket certified to UL 964, laid flat and not folded while running, is a low-risk appliance. The real risks concentrate in old blankets, damaged wiring, and users who cannot feel that they are too warm. Full answer.

Do electric blankets cause fires?

They can, overwhelmingly when they are old or damaged rather than new. The three failure modes are cracked element insulation from years of flexing, trapped heat from folding or covering, and cord damage. What actually goes wrong.

Is it safe to leave an electric blanket on all night?

For a healthy adult with a modern blanket laid flat, generally yes, and the auto shut-off will end the session anyway. Ranges run from two to twelve hours. What the timer does and does not protect you from.

Who should not use an electric blanket?

Infants and very young children, anyone with reduced sensation, and anyone who cannot operate the controller or move away from the heat. Pacemakers and pregnancy are clinical questions for a doctor. Full detail. Nothing on this site is medical advice.

Do electric blankets cause cancer?

The research on low-frequency electromagnetic fields is large, contested and not something a product site should summarize as settled. No causal link has been established and no US regulator restricts these products on EMF grounds. What we can and cannot say.

Are heated blankets safe for cats and dogs?

Human blankets are not designed for animals. The specific risks are claws puncturing the element and teeth through the cord. A heated mattress pad under a fitted sheet removes both. More.

How old is too old for an electric blanket?

Around ten years is the broad consumer-safety guidance, sooner if it has been washed often or stored hard-folded. Element insulation degrades invisibly, so age is a better guide than how well it seems to work.

Can you wash an electric blanket?

Yes. Detach the controller and power cord first, then gentle or delicate cycle, cool water, slow spin. Never dry clean, never bleach, never wring. The full sequence.

Can you put an electric blanket in the dryer?

Usually on low, briefly. Biddeford states its blankets are dryer safe on low heat; Westinghouse says tumble dry low or line dry. Every maker agrees it must be completely dry before use.

How should I store a heated blanket in summer?

Clean, completely dry, rolled rather than folded, somewhere dry and uncompressed. A hard crease is a permanent stress point in the element. More.

Should I buy a blanket, a throw or a mattress pad?

A pad if the problem is getting into a cold bed, a blanket if it is staying warm once you are in, and a throw if it is one person on a sofa. Blanket vs pad and throw vs blanket.

What size electric blanket do I need?

Match your mattress: twin 62 by 84, full 72 by 84, queen 84 by 90, king 90 by 100. On a shared bed the more important question is whether it has one controller or two.

Is dual control worth it?

On a shared bed, yes, and it is the least reversible decision in the purchase. A single-controller queen heats the whole bed to one temperature and no number of heat settings fixes that. If you sleep alone, skip it. Options.

Can you use a heated blanket with a memory foam mattress?

Yes, with the heat source above the foam and never below it. Foam insulates, so a pad under a topper heats the underside of the topper rather than you. Detail.

Can you use an electric blanket while camping?

On a pitch with electric hookup, yes. Without hookup you need a 12V blanket plus a vehicle socket or a power station, and none of the 12V blankets publishes the wattage you would need to plan runtime. More.

Do you test the blankets you recommend?

No. We have tested zero units and we say so on every page. What we do instead is compile published manufacturer specifications, cite each one, and show the cost arithmetic so you can check it. Our methodology.

How does Wool Watt make money?

We earn a commission when someone buys through a link here, at no extra cost to you, through the Amazon Associates program. We accept no free products and no sponsored placements. Full disclosure.

Where does your electricity rate come from?

US Energy Information Administration, Electric Power Monthly, Table 5.3 (June 2026): 18.34 cents per kWh, average US residential, retrieved 2026-08-31. It is a national average and your own rate is probably different, so every table publishes the kWh figure alongside the dollars so you can substitute your own.