Can a Power Station Run a Space Heater? The Math
Can a power station run a space heater? Yes, briefly: a 1kWh unit lasts about 35 minutes on 1,500 W. See runtimes for five stations and why blankets win.
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Yes, a power station can run a space heater, but only for minutes. A 1,500 W heater on high drains a 1,024Wh EcoFlow DELTA 3 Plus in about 35 minutes, and even a 4,096Wh EcoFlow DELTA Pro 3 lasts only about 2.3 hours. An electric blanket runs 15 to 25 times longer on the same battery.
That’s not a flaw in any one product. Making heat from electricity takes enormous energy, and batteries store far less of it than a tank of fuel.
How many watts does a space heater use?
The EPA typical-wattage list in our appliance wattage table gives portable heaters a nameplate range of 750 to 1,500 W. Most plug-in heaters sold in the US top out at 1,500 W on high, and their low setting draws about half that.
| Heater setting | Draw | Energy per hour | Rated capacity used per hour (at 85% usable) |
|---|---|---|---|
| High | 1,500 W | 1,500 Wh | about 1,765 Wh |
| Low | 750 W | 750 Wh | about 880 Wh |
If the difference between watts and watt-hours is fuzzy, our watts vs watt-hours explainer covers it. Every watt a heater draws turns into heat, so there’s no efficient model hiding behind the marketing. A “ceramic,” “oil-filled” or “infrared” 1,500 W heater all use the same 1,500 W. They differ in how they spread the heat, not how much energy they consume.
Space heater runtime by power station
We computed runtimes for five stations from 1kWh to 4kWh, using 85% of rated capacity as usable energy, the same assumption behind our runtime calculator.
| Station | Rated | Usable | Heater on high (1,500 W) | Heater on low (750 W) | Single blanket (60 W) | Double blanket (100 W) |
|---|---|---|---|---|---|---|
| Jackery Explorer 1000 v2 | 1,070 Wh | 910 Wh | 36 min | 1.2 h | 15 h | 9.1 h |
| EcoFlow DELTA 3 Plus | 1,024 Wh | 870 Wh | 35 min | 1.2 h | 15 h | 8.7 h |
| Anker SOLIX F2000 | 2,048 Wh | 1,741 Wh | 1.2 h | 2.3 h | 29 h | 17 h |
| Jackery Explorer 2000 Plus | 2,043 Wh | 1,736 Wh | 1.2 h | 2.3 h | 29 h | 17 h |
| EcoFlow DELTA Pro 3 | 4,096 Wh | 3,482 Wh | 2.3 h | 4.6 h | 2.4 days | 35 h |
Read across any row and the trade-off is stark. The F2000 buys you a bit over an hour of high heat, or more than a full day of electric-blanket warmth.
| Appliance | Draw | Inverter | Runtime | Runtime as a share of 24 hours |
|---|---|---|---|---|
| Portable space heater (high setting) | 1,500 W | Runs | 35 min | |
| Electric blanket (single) | 60 W | Runs | 15 h | |
| Electric blanket (double) | 100 W | Runs | 8.7 h |
Runtime = usable energy ÷ average draw. We count 85% of the rated 1,024 Wh as usable (870 Wh) to cover inverter and DC conversion losses. Fridges and freezers are averaged over their compressor cycle. An appliance runs only if its running watts fit the 1,800 W inverter and its start-up surge fits the 3,600 W surge rating. Wattages come from our appliance wattage table; try your own mix in the runtime calculator.
| Appliance | Draw | Inverter | Runtime | Runtime as a share of 24 hours |
|---|---|---|---|---|
| Portable space heater (high setting) | 1,500 W | Runs | 1.2 h | |
| Electric blanket (single) | 60 W | Runs | 29 h | |
| Electric blanket (double) | 100 W | Runs | 17 h |
Runtime = usable energy ÷ average draw. We count 85% of the rated 2,048 Wh as usable (1,741 Wh) to cover inverter and DC conversion losses. Fridges and freezers are averaged over their compressor cycle. An appliance runs only if its running watts fit the 2,400 W inverter and its start-up surge fits the 3,600 W surge rating. Wattages come from our appliance wattage table; try your own mix in the runtime calculator.
| Appliance | Draw | Inverter | Runtime | Runtime as a share of 24 hours |
|---|---|---|---|---|
| Portable space heater (high setting) | 1,500 W | Runs | 2.3 h | |
| Electric blanket (single) | 60 W | Runs | 2.4 days | |
| Electric blanket (double) | 100 W | Runs | 35 h |
Runtime = usable energy ÷ average draw. We count 85% of the rated 4,096 Wh as usable (3,482 Wh) to cover inverter and DC conversion losses. Fridges and freezers are averaged over their compressor cycle. An appliance runs only if its running watts fit the 4,000 W inverter and its start-up surge fits the 8,000 W surge rating. Wattages come from our appliance wattage table; try your own mix in the runtime calculator.
The figures above assume the heater runs flat out. In a small, well-insulated room, a heater with a thermostat will cycle off once the room warms up. If yours ends up running half the time, double the runtime. If the room leaks heat as fast as the heater makes it, it never cycles, and the table is exactly what you’ll get.
Which stations can even start a 1500W heater?
A heater is a resistive load. There’s no motor, so there’s no start-up surge, and the station’s surge rating is irrelevant. What matters is continuous AC output: at least 1,500 W for high, or 750 W if you’ll only ever use low.
Of the 39 stations we track, 29 can run a 1,500 W heater on high. These ten can’t:
| Station | Continuous AC output | Runs the 750 W low setting? |
|---|---|---|
| EcoFlow RIVER 3 | 300 W | No |
| Jackery Explorer 300 Plus | 300 W | No |
| Goal Zero Yeti 500 | 500 W | No |
| EcoFlow RIVER 3 Plus | 600 W | No |
| BLUETTI Elite 30 V2 | 600 W | No |
| BLUETTI AC50B | 700 W | No |
| OUPES Exodus 700 | 700 W | No |
| BLUETTI AC70 | 1,000 W | Yes |
| DJI Power 500 | 1,000 W | Yes |
| Anker SOLIX C800 Plus | 1,200 W | Yes |
The Jackery Explorer 1000 v2 sits right on the line at 1,500 W continuous. It will run a 1,500 W heater, but with no headroom for anything else on the same station at the same time. The DELTA 3 Plus has 300 W to spare, the F2000 900 W, the Jackery 2000 Plus 1,500 W and the DELTA Pro 3 2,500 W.
Low setting vs high setting
Halving the draw doubles the runtime, and that’s the only free lunch available. On a 2kWh station, low gets you about 2.3 hours instead of 1.2.
Low is the smarter setting for warming one small, closed room for a short stretch, for example taking the edge off a bedroom before you get into bed. It isn’t a path to overnight heat. Eight hours on low is 6,000 Wh, which needs about 7,100 Wh of rated capacity. Eight hours on high needs about 14,100 Wh.
For scale: the DELTA Pro 3 expands to 12,000 Wh with two extra batteries, and the Anker SOLIX F3800 can grow to 26,880 Wh. A setup that size can run a heater on low through a night, but it’s a whole-home backup system, not a portable heater battery. Our home backup picks compare those systems.
Electric blankets: 15x the runtime
Electric blankets put heat directly against your body instead of trying to warm the air in a room. That’s why they need so little power. The EPA list rates a single blanket at 60 W and a double at 100 W.
| Load | Draw | Runtime multiple vs heater on high |
|---|---|---|
| Heater on high | 1,500 W | 1x |
| Heater on low | 750 W | 2x |
| Double electric blanket | 100 W | 15x |
| Single electric blanket | 60 W | 25x |
On the DELTA 3 Plus, that’s the difference between 35 minutes of heater and 8.7 to 15 hours of blanket, enough for a full night. Blanket thermostats also cycle once the bed is warm, so real runtime usually beats these figures, which assume continuous draw.
A blanket is also an easy load for small stations. The 600 W EcoFlow RIVER 3 Plus can’t touch a heater, but its 286 Wh runs a single blanket for about 4.1 hours by our math. A mid-size station in the 700 to 1,100 Wh range is the sweet spot: a full night of blanket heat plus phones and a light.
Better ways to stay warm in an outage
If staying warm without grid power is the goal, plan around energy, not watts:
- Heat people, not rooms. Electric blankets, heated mattress pads and good sleeping bags deliver warmth for a fraction of the energy.
- Shrink the space. Close off one room, hang blankets over doorways and windows, and keep everyone in it.
- Keep the furnace fan running if you have gas heat. A gas furnace’s blower is far less demanding than a resistive heater. See our runtime math for furnace blowers in the runtime calculator, which includes 1/4 HP and variable-speed blower figures.
- Use the heater in bursts. Fifteen minutes on high pre-warms a small room and costs about 375 Wh, roughly 43% of a DELTA 3 Plus.
- Recharge during the day. Solar won’t keep up with a heater, but it can refill what a blanket used overnight. Our panel matcher shows which panels fit your station.
| Spec | Jackery Explorer 1000 v2 | EcoFlow DELTA 3 Plus | Anker SOLIX F2000 | Jackery Explorer 2000 Plus | EcoFlow DELTA Pro 3 |
|---|---|---|---|---|---|
| Score | 6.2 | 9.0 | 7.2 | 7.3 | 8.8 |
| Battery chemistry | LiFePO4 | LiFePO4 | LiFePO4 | LiFePO4 | LiFePO4 |
| Rated cycle life | — | 4,000 | 3,000 | — | 4,000 |
| AC output | 1,500 W | 1,800 W | 2,400 W | 3,000 W | 4,000 W |
| Energy density | 44.96 Wh/lb | 37.1 Wh/lb | 30.48 Wh/lb | 33.22 Wh/lb | 36.09 Wh/lb |
| AC recharge time | 60 min | 56 min | — | — | — |
| Solar recharge rate | 0.37 W per Wh | 0.98 W per Wh | 0.49 W per Wh | 0.69 W per Wh | 0.63 W per Wh |
| Expandable | No | Yes | Yes | Yes | Yes |
| UPS switchover | 20 ms | 10 ms | 20 ms | 20 ms | 10 ms |
| Warranty | 3 yr | 5 yr | 5 yr | 3 yr | 5 yr |
| App control | wifi+bluetooth | wifi+bluetooth | bluetooth | wifi+bluetooth | wifi+bluetooth |
| Launch MSRP | $799 | — | — | — | $3,699 |
To try your own mix, such as a blanket, a phone and a lamp, run it through the calculator. Every number on this page follows the method on our how we evaluate page.
What you'll plug in
- Full-size refrigerator (ENERGY STAR)160 W, cycles 32% of the time
- Wi-Fi router6.5 W
- LED bulb (60 W equivalent)9 W
- Smartphone charger10 W
Runs all of it for about 8.3 h on a full charge.
- Runtime
- 8.3 h
- Running watts
- 214of 1,800 W inverter
- Start-up peak
- 214of 3,600 W surge
- Average draw
- 105W after cycling
Runtime = 85% of the battery's rated Wh (usable after inverter and DC losses) ÷ the average draw. The start-up peak assumes one motor starts at a time.
Smallest stations that run this load
| Station | Battery | Inverter | Runtime | Buy |
|---|---|---|---|---|
| EcoFlow RIVER 3 | 245 Wh | 300 W | 2.0 h | Amazon |
| EcoFlow RIVER 3 Plus | 286 Wh | 600 W | 2.3 h | EcoFlow |
| Anker SOLIX C300 | 288 Wh | 300 W | 2.3 h | Anker SOLIX |
| BLUETTI Elite 30 V2 | 288 Wh | 600 W | 2.3 h | BLUETTI |
| Jackery Explorer 300 Plus | 288 Wh | 300 W | 2.3 h | Amazon |
| BLUETTI AC50B | 448 Wh | 700 W | 3.6 h | BLUETTI |
| Goal Zero Yeti 500 | 499 Wh | 500 W | 4.1 h | Goal Zero |
| DJI Power 500 | 512 Wh | 1,000 W | 4.2 h | DJI |
Frequently asked questions
How long will a 1000Wh power station run a space heater?
About 35 minutes on high. A 1,500 W heater uses roughly 1,765 Wh of rated capacity per hour once you allow for 85% usable energy, so the 1,024Wh EcoFlow DELTA 3 Plus lasts about 35 minutes and the 1,070Wh Jackery Explorer 1000 v2 about 36.
What size power station do I need to run a space heater all night?
Eight hours at 1,500 W is 12,000 Wh, which needs about 14,100 Wh of rated capacity. Even on a 750 W low setting you'd need about 7,100 Wh, beyond any single unit in our catalog without expansion batteries.
Can a power station run a 1500W heater on low?
Yes, if its inverter handles the high setting or at least 750 W. On low, a 2kWh station like the Anker SOLIX F2000 runs a heater for about 2.3 hours.
Is an electric blanket better than a space heater on battery power?
By a wide margin. A single blanket draws 60 W and a double 100 W, so a 1kWh station runs one for about 9 to 15 hours, against about 35 minutes for a heater on high.
Do power station surge ratings matter for space heaters?
No. A heater is a resistive load with no motor to start, so it never spikes above its rated draw. Only the continuous inverter rating matters.