Short answer: yes, but the runtime is short enough that “run a space heater” and “heat your apartment through a winter outage” are two very different promises — and most product listings blur that line.
Here’s the real math, and the much more efficient alternative we’ve recommended elsewhere in this series.
How Many Watts Does a Space Heater Actually Use?
Most electric space heaters draw between 750 and 1,500 watts, depending on the heat setting:
| Heater Type | Typical Wattage |
|---|---|
| Ceramic heater, low setting | 500–750W |
| Oil-filled radiator | 600–1,500W |
| Infrared/quartz heater | 600–1,500W |
| Fan-forced heater, high setting | 1,200–1,500W |
Unlike a fridge’s compressor, a space heater draws its full wattage continuously the entire time it’s running — there’s no cycling on and off to average the load down, which is exactly why the runtime numbers below are so much shorter than what we’ve calculated for other devices in this series.
The Real Math: How Long Will It Actually Run?
Using our established ~85% inverter efficiency figure across the power station sizes covered throughout this site:
| Power Station | Usable Capacity | 750W Heater | 1,500W Heater |
|---|---|---|---|
| 300Wh unit | ~255Wh | ~0.34 hours (~20 min) | Not recommended — exceeds most 300Wh units’ output limit |
| 1000Wh unit | ~850Wh | ~1.1 hours | ~0.57 hours (~34 min) |
| EcoFlow Delta Pro (3,600Wh) | ~3,060Wh | ~4.1 hours | ~2 hours |
The pattern holds across every power station brand and size we found in our research: even a large, expensive unit gives you a couple of hours of heat at most on a 1,500W setting, not an overnight solution. A 750W low setting roughly doubles your runtime compared to the same unit on 1,500W — a real, practical lever if you do go this route.
Check the Output Rating Before You Even Try
Beyond runtime, there’s a harder limit worth checking first: your power station’s continuous AC output needs to exceed the heater’s wattage, with some margin. A 1,500W heater needs a power station rated for meaningfully more than 1,500W continuous output — many mid-range units (including some we’ve covered in this series, like the Explorer 1000 v2’s 1,500W ceiling) sit right at that limit with no real headroom, which risks an overload shutdown rather than steady heat.
The Better Answer: Don’t Use the Space Heater
We flagged this briefly in our winter storm prep guide, and the math above makes the case even more clearly: an electric blanket, drawing only 60–100W, delivers hours more warmth per charge than a space heater ever will — the same order of magnitude as a CPAP machine’s power draw, not a heating appliance’s. At 850Wh usable on a 1000Wh station, an electric blanket at 80W runs for roughly 10.6 hours — nearly 19 times longer than the same station running a 1,500W heater.
If body warmth, not room warmth, is the actual goal — which it usually is during a short-term outage — an electric blanket accomplishes that far more efficiently than heating the air around you ever will.
When a Space Heater Still Makes Sense
- Short warm-up sessions, not sustained overnight heating — using the heater for 20–30 minutes to take the chill off a room before switching to blankets and warm clothing.
- Paired with a high-capacity unit like the Delta Pro, where 2+ hours of continuous heat is a genuine option, not just a brief burst.
- On the lowest wattage setting available, since halving the wattage roughly doubles the runtime for the same battery.
The Bottom Line
A portable power station can run a space heater, but the runtime — typically 30 minutes to about 2 hours depending on capacity and heat setting — makes it a poor primary heating strategy for a multi-hour or overnight outage. For actual warmth that lasts through the night, an electric blanket at a fraction of the wattage is the far more efficient use of the same battery capacity, and it’s the option we’d recommend leading with.
