Are Heated Blankets Energy Efficient? | The Real Cost Per Night

For the full breakdown, see our best Wireless Heated Blanket guide.

Wondering whether heated blankets are energy efficient comes down to one key difference: they warm you directly instead of trying to heat the air in an entire room. That localized warmth means a typical blanket draws only 50–200 watts, with most models landing between 60 and 150 watts depending on size and heat setting. Compare that to a 1,500-watt space heater and the math gets interesting fast.

The table below shows what that wattage actually costs on your bill, plus how the blanket stacks up against the alternatives for keeping warm this winter.

How Much Electricity Does A Heated Blanket Use?

A heated blanket uses roughly 60–100 watts on an average setting, with larger sizes or higher heat levels pushing that toward 150 watts and beyond. The wattage is printed on the blanket’s label or tag, so a quick check tells you the exact number for your model.

At 80 watts for 8 hours of overnight use, the math works out to about 0.64 kWh per night. At the U.S. average electricity rate of $0.15/kWh, that’s under $0.10 per night — roughly $3 per month if you run it every single night. Medisana’s FAQ describes heated blankets as “very energy-efficient,” noting they use about 100 watts per hour on average while delivering targeted warmth rather than heating the whole room.

The most efficient way to use one is to run it for 10–30 minutes to warm the bed, then switch it off before you fall asleep. EnergyAustralia notes that this short preheat window is usually all you need on an average setting, and it estimates a single-bed electric blanket used nightly for three months of winter at about $20 per season including pre-heating.

Heated Blanket Vs Space Heater Cost

A heated blanket wins on energy use by an order of magnitude. A typical 1,500-watt space heater running for the same hours draws roughly 15 to 20 times more power than an 80-watt blanket, and central heating is an even bigger draw because it warms every room in the house, not just the one you’re in.

That’s the core efficiency argument: personal warmth beats ambient warmth when you’re the only one who needs it. EnergyAustralia figures the average cost of running an electric blanket at about 4 cents per hour — a fraction of what a space heater costs per hour at the same electricity rate.

For a quick cost comparison, here’s how the options stack up:

*Based on a U.S. average electricity rate of $0.15 per kWh.

Even at the blanket’s highest setting, you’re looking at pennies per night against dollars for the alternatives.

What Affects Your Actual Energy Use?

Your real cost depends on three variables: the heat setting you choose, how long you run it, and your local electricity rate. Higher settings draw more watts, and leaving the blanket on all night at maximum heat will cost noticeably more than a 20-minute preheat session.

Local rates swing the numbers too. International examples show the range: at 100 watts, a night’s use costs about 3.5 cents in Ontario, about 5 cents in British Columbia, and about 6 cents in Alberta, based on those provinces’ electricity rates. Your own bill’s per-kWh rate is the number to plug into the math for a precise figure.

One common mistake is treating a heated blanket as a whole-home heating replacement. It’s designed for personal warmth — keeping you cozy on the couch or in bed — not for warming the air in a room. Using it that way is actually the efficient play: you stay warm without paying to heat empty space. And leaving it on all night at high settings raises consumption compared with using it briefly to warm the bed, which is often enough on an average setting.

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