Space Heater vs Electric Blanket
Both keep you warm on a cold night, but they solve different problems and cost very different amounts to run. Here is how to pick, or how to use both.
The short answer
Two different jobs
A space heater and an electric blanket are not really competing products, even though they get compared constantly every winter. A space heater raises the air temperature of a room — you can sit up, walk around, read at a desk or get dressed, and it stays comfortable. An electric blanket raises the temperature of your body, or the small pocket of air trapped under the covers with you. Step out from under it and you are back in a cold room instantly. Neither is "better" in the abstract; the right pick depends on what you are actually trying to do at that moment.
The cost difference, with real numbers
Running cost comes down to the same formula every time: kilowatts x hours x price per kilowatt-hour. The US average residential electricity rate is about $0.17 per kWh (illustrative — check your own utility bill for your exact rate). A compact space heater in the 1,500-watt class draws 1.5 kW. A typical electric blanket draws somewhere between 60 and 100 watts depending on size and setting, so we will use 0.1 kW as a representative figure.
| Appliance | Typical wattage | Cost per hour | Cost for 4 hrs/day, 30 days | Warm-up time | What it heats |
|---|---|---|---|---|---|
| Electric blanket | ~100 W (0.1 kW) | $0.017 | ~$2.04 | 2-5 minutes | Your body under the covers |
| Compact ceramic space heater | ~1,500 W (1.5 kW) | $0.255 | ~$30.60 | ~60 seconds to warm air; a few minutes for the room | A single room, up to ~130 sq ft |
| Both together (typical use) | ~1,600 W combined | $0.272 | ~$32.64 | Body warm in minutes, room warm shortly after | Room + body |
The gap looks dramatic, and per hour it is — an electric blanket is genuinely one of the cheapest ways to keep a person warm. But a heater is doing a different job: it is the only one of the two that lets you sit up, work, or have someone else in the room and still feel warm. For a deeper breakdown of running costs by state and rate, see our space heater cost by state guide, or estimate your own numbers with the running cost calculator.
Recommended in this guide
The compact heater this guide keeps coming back to
RapidHeat is a hand-sized ceramic heater that plugs straight into a wall outlet, pushes out warm air in about a minute and switches itself off on a timer. It is built for warming one room properly, not a whole house.
- Warm in ~60 seconds
- Under 30 dB
- Auto shut-off & timer
Comfort: heating a room vs heating a body
The honest tradeoff is this. An electric blanket puts heat exactly where you are, with almost no waste, which is why it is so cheap. A space heater wastes some heat warming air you are not directly touching, but that air keeps you comfortable no matter where you move in the room, keeps a second person warm too, and does not need you to be lying down under a cover. If you read in bed, work at a desk, or get up during the night, only a heater actually solves that. If you are just trying to fall asleep faster and stay warm in one spot, a blanket wins on cost every time.
“We run the electric blanket to warm the bed before we get in, then a small heater on the timer for the twenty minutes it takes to get ready for bed. Best of both without a huge bill.”
Safety considerations for each
- Electric blankets: replace them if the cord is frayed or the fabric is worn thin; avoid folding them sharply or letting pets sleep on top, which can damage internal wiring; follow the manufacturer's instructions on whether it is rated for overnight use or for use with other bedding on top.
- Space heaters: plug directly into a wall outlet, keep at least three feet of clearance from bedding and curtains, place on a hard flat surface, and use a timer rather than leaving it running unattended for hours. See our full space heater safety guide for details.
The National Fire Protection Association publishes seasonal guidance on both categories of heating equipment, and it is worth a skim every autumn if you use either product regularly.
When a space heater clearly wins
- You need the whole room comfortable, not just yourself.
- You are working, reading or getting dressed rather than lying still.
- More than one person or a pet needs to be warm in the same space.
- You are trying to avoid running central heat for a whole house to warm one occupied room — see space heater vs central heating.
When an electric blanket clearly wins
- You just want to be warm in bed as cheaply as possible.
- You fall asleep quickly and do not need the room itself warm.
- You want near-silent, near-zero-cost background warmth for hours.
Why many households run both
The pattern that comes up again and again in customer feedback is a short burst from a heater to take the chill off the room while getting ready for bed, paired with an electric blanket that runs longer and far more cheaply once you are actually under the covers. A RapidHeat unit on its built-in timer suits this well: warm air in about 60 seconds, then it switches itself off so you are not paying to heat an empty room while the blanket does the overnight work. If a bedroom is the main use case, our best space heater for a bedroom guide covers sizing and safe overnight habits in more depth.
Common questions
Is an electric blanket cheaper than a space heater?
Per hour, yes. A typical electric blanket draws around 100 watts versus roughly 1,500 watts for a compact space heater, so it costs a fraction as much to run. It only warms your body, though, not the room around you.
Can I use a space heater and an electric blanket together?
Many people do: the blanket keeps you warm in bed while a heater on a timer takes the chill off the room for the short time before you fall asleep. Just avoid piling bedding over a space heater, and never cover an electric blanket with extra blankets unless the manufacturer says it is rated for that.
Why does my room still feel cold even with an electric blanket?
An electric blanket heats only the body under it. It does nothing for room air temperature, so getting out of bed, dressing, or having a guest in the room will still feel cold. That is the main reason people add a space heater.
Are electric blankets safe to leave on all night?
Most modern electric blankets are rated for overnight use and have low-voltage designs with auto shut-off, but always check the manufacturer's instructions. Older or worn blankets with frayed wiring should be replaced rather than used overnight.
How much does it cost to run a space heater for a whole evening?
A 1,500-watt heater run for 4 hours uses 6 kWh. At the US average residential rate of about 17 cents per kWh, that is roughly $1.02 for the evening, though a thermostat-controlled unit that cycles off will usually cost less in practice.
Does an electric blanket dry out the air like a heater can?
No. Because it heats a person directly rather than a volume of air, an electric blanket does not affect room humidity the way running a heater for hours in a closed room can.
Sources & how we got these numbers
- US Energy Information Administration — Electricity Monthly — average US residential electricity price used for cost estimates
- Department of Energy — Small Space Heaters — background on space heater wattage and efficient use
- NFPA — Home Heating Safety — safety guidance for heating equipment in the home
Costs are illustrative and calculated at the US average residential electricity rate. Your own rate, room and usage will change the result. See our editorial standards.
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