Quick answer
Technically yes, if the inverter can pass enough watts, but a mains electric heater is the worst-value load you can put on a power station and it drains the battery faster than anything else you own. Fan and convector heaters draw 1,500 to 3,000W of continuous resistive heat, so a 1,000Wh station runs a 1,500W heater for only about 30 to 35 minutes, and a 3,000Wh station runs a 2,000W heater for roughly 75 minutes. A 1,000 to 2,000W inverter cannot start a 3,000W heater at all. The smart move is low-wattage heat: a heated blanket or heated gilet draws only 50 to 100W, so the same 1kWh unit keeps one running for 8 to 15 hours or more, which is far more useful in a tent or a power cut.
Can a power station run an electric heater?
Technically yes, if the inverter is rated high enough to pass the watts, but a mains electric heater is the worst-value load you can put on a power station and it will flatten the battery faster than anything else you plug in.
The problem is physics, not the battery. A fan heater or convector heater makes warmth by forcing current through a resistive element, and that takes a large, continuous draw. Most UK plug-in heaters pull between 1,500W and 3,000W the entire time they run. A power station stores its energy in watt-hours, so a heater rated at thousands of watts empties a tank measured in a similar number of watt-hours within the hour.
That is why heating is the load that disappoints buyers most. A unit that charges phones for a week feels bottomless right up until you plug a heater into it, at which point the runtime collapses to minutes.
How long will a power station run a heater? (runtime maths)
The sum is simple. Take the station's rated capacity, keep about 85% of it because the inverter and battery lose the rest as heat, then divide by the heater's wattage.
A 1,000Wh station holds roughly 870Wh you can actually use. Feed that to a 1,500W heater and you get 870 divided by 1,500 of an hour, which is a little over half an hour. The table below runs that maths for the loads people actually try.
| Power station | Usable (~85%) | Heater load | Runtime estimate |
|---|---|---|---|
| ~1,000Wh | ~870Wh | 1,500W fan heater | ~30-35 minutes |
| ~1,000Wh | ~870Wh | 2,000W heater | ~25 minutes |
| ~2,000Wh | ~1,740Wh | 2,000W heater | ~50 minutes |
| ~3,000Wh | ~2,610Wh | 2,000W heater | ~75 minutes |
| ~3,000Wh | ~2,610Wh | 3,000W heater | ~50 minutes |
These are calculated estimates, not lab tests, and real figures run a little shorter because a cold battery, a thermostat cycling and the inverter's own draw all eat into them. But the shape is clear: even a large, expensive 3,000Wh unit gives you around an hour of a full-size heater, then it is done.
Output matters as much as capacity, and it is the thing people forget. A power station can only pass what its inverter is rated for. A 1,000Wh unit with a 2,000W inverter cannot start a 3,000W heater at all, and a smaller 1,000 to 1,500W inverter will refuse a 2,000W heater the instant it senses the overload. Check the heater's wattage against the station's continuous output before capacity even enters the conversation.
The smart alternative: low-wattage heat
If you want warmth from a power station and you want it to last, stop thinking about heating the air and start thinking about heating the person. That single change turns an impossible load into an easy one.
A heated blanket or a heated gilet draws only about 50 to 100W, because it warms you directly instead of trying to raise the temperature of a whole tent or room. Run the same maths and the numbers transform:
| Power station | Usable (~85%) | Low-wattage load | Runtime estimate |
|---|---|---|---|
| ~1,000Wh | ~870Wh | 60W heated blanket | ~14 hours |
| ~1,000Wh | ~870Wh | 100W heated gilet | ~8-9 hours |
| ~3,000Wh | ~2,610Wh | 60W heated blanket | ~40+ hours |
A 1kWh unit that gives you half an hour of a fan heater gives you the best part of a night, or several nights, with a heated blanket. For camping, a campervan or riding out a power cut, that is the difference between a gimmick and genuine warmth. It is also gentler on the battery, because a steady 60W draw runs cool and quiet where a 2,000W draw pushes the inverter hard.
The same logic applies to a small 12V electric blanket run off the DC output, which skips the inversion losses entirely. If cold-weather use is the whole reason you are buying a power station, size it around low-wattage heat, not a mains heater.
Which power station if you insist on a mains heater?
If you have a genuine short-burst need for a plug-in heater, take the chill off a caravan for ten minutes before bed, the two rules are: buy big, and check the output.
For any real chance of running a mains heater you want the Anker SOLIX F3000, a 3,072Wh unit with a 3,600W continuous inverter. That output is high enough to start even a 3,000W heater, and the capacity gives you roughly an hour of a 2,000W load before it needs recharging. It expands to 12,288Wh if long outages are the concern, though at 41.5kg it is a wheel-along home-backup unit, not something you carry to a pitch.
For everyone else, and for the heated-blanket approach that actually makes sense, a 1kWh unit like the Anker SOLIX C1000 Gen 2 is plenty. Its 1,024Wh capacity and 2,000W output will not sustain a fan heater for long, but it runs a heated blanket all night, charges every device you own for days, and weighs a third of the F3000.
Buy the Anker SOLIX C1000 Gen 2 on AmazonFAQ
Can a power station run an electric heater?
How long will a 1,000Wh power station run a heater?
Why does a heater drain a power station so fast?
What is the best way to stay warm with a power station?
Can a power station run a 3,000W heater?
Where to next
Heating aside, the complete portable power station buying guide ranks every current UK model against the same fact base, and what size power station do I need walks you through working out your own watt-hours so you buy for the loads you actually run.