Published September 24, 2026 · Reserve Current editorial guide
Quick answer: Resistive heat uses far more energy than a battery holds. A 1,500W space heater would empty a 1,024Wh station in about 31 minutes. Use the battery for lights, communication, a CO alarm, phone charging and perhaps a furnace-free warming plan — and keep heat safety rules in mind.
The arithmetic of electric heat
A typical plug-in space heater draws about 1,500W on its high setting. A 1,024Wh station with 10% held in reserve and 85% conversion efficiency delivers about 783Wh at the outlet: roughly 31 minutes of heater operation. Many stations also list a continuous AC output near or below 1,500W, and a special high-power mode is not the same as full normal output.
What the battery is good for in the cold
Lighting, phones, a radio, internet equipment and small loads are where a station shines during a winter outage. Some people use a low-wattage heated blanket or mattress pad; check its label for power and for any restriction on use with a power station, and follow the manual. Warm clothing, a smaller closed-off room and blankets do more for comfort per watt-hour than any heater.
Your furnace is a wiring question
Gas and oil furnaces still need electricity for the blower, igniter and controls. They are usually hardwired, so you cannot simply plug them into a station. Powering a furnace circuit from a battery or generator needs an approved inlet or transfer switch installed by a qualified electrician. Never back-feed a house through a wall outlet.
Keep the cold battery working
Lithium batteries have charging temperature limits. Check the operating and charging temperatures in the manual and keep the station inside the living space, not in an unheated garage or car. Charge it fully before the storm arrives.
Carbon monoxide and fire
- Fuel generators outdoors only, at least 20 feet from the house; never in a garage (CPSC). CPSC reports roughly 100 US deaths a year from portable-generator carbon monoxide.
- No charcoal grills or gas stoves for heating indoors (CDC).
- Battery-operated CO and smoke alarms on every level and outside sleeping areas; test them monthly (CPSC).
- Space heaters at least 3 feet from anything that can burn, plugged directly into an outlet, not into a power strip or extension cord (CPSC).
- Use flashlights or battery candles instead of candles.
Frequently asked questions
Can a portable power station run a space heater?
Only briefly. A typical 1,500W space heater would drain a 1,024Wh station in roughly 31 minutes at 85% efficiency with a 10% reserve, and many stations list a continuous output close to or below that load.
Can I run my gas furnace from a power station?
A furnace blower and controls are usually hardwired, so there is nothing to plug in safely. Connecting a battery or generator to a furnace circuit requires an approved transfer arrangement installed by a qualified electrician.
How do I stay safe using heat sources during an outage?
CPSC advises keeping space heaters at least 3 feet from beds, curtains and furniture, plugging them directly into an outlet rather than a power strip or extension cord, never using charcoal or generators indoors, and installing battery-operated carbon monoxide and smoke alarms on every level.