Can a Portable Power Station Run a Gas Furnace?

Why a gas furnace stops when the power goes out

A gas furnace will not operate during an outage, even with gas in the line ¹. The burner makes the heat, but electricity runs the blower, the fan of your HVAC system that pushes warm air through the ducts, along with the controls, the igniter and the draft inducer fan. The controls alone draw 4 to 13 W on standby ².

So the question is not whether a battery can make heat. It is whether it can run those parts long enough. Hot-water boilers have their own pump and controls: see our heating guide.

How many watts a furnace blower uses

The blower is the big load. A field study of 31 new furnaces in Wisconsin measured it ²:

• Standard blower (PSC motor): a median of 500 W, measured in fan-only mode, where these blowers ran at their heating speed.
• Variable-speed blower (ECM motor): a median of 100 W in fan-only mode, at low airflow. When heating, it speeds up and draws more.

A Virginia Cooperative Extension list puts a furnace fan at 750 W ⁹. That is a nameplate figure, a maximum rather than a typical draw.

The study dates from 2004, so your furnace may differ. Two better guides are on your side of the wall:

1. The rating plate inside the furnace door lists the amps. Amps × 120 V gives the most it can draw.
2. Your winter gas bill. The median standard furnace in the study used about 1 kWh of electricity per therm of gas (9.5 kWh per gigajoule); variable-speed furnaces used about half ². If January shows 150 therms, that is 5 therms a day, or about 5 kWh of electricity a day. The bill also counts your water heater and stove, so this errs on the high side.

How long a power station will run it

The panel above assumes the blower runs nonstop at 500 W. A furnace cycles on and off, which stretches the time, while the igniter and inducer add to the draw when it fires. Treat the figures as a planning estimate, not a promise.

Before an outage, turn off the feature that switches the outlets off on its own:

• Anker SOLIX C1000 Gen 2: Anker’s user guide says the station’s default standby time is 12 hours and can be changed in the Anker app ¹¹. Set the longest time, then test that the station stays on while the furnace is idle.
• EcoFlow DELTA 3 Plus: set the AC timeout to “never” in the EcoFlow app ¹².
• BLUETTI Elite 200 V2: ECO mode is on by default, and BLUETTI says to disable it for critical appliances. Hold the AC and DC buttons for about 2 seconds to enter Settings Mode, press DC until you reach ECO Mode, then press AC; or use the BLUETTI app ¹³.
• BLUETTI Apex 300: ECO mode is on by default and cuts AC output after 4 h at 10 W or less. Press the ECO button ¹⁴.
• Jackery HomePower 3600 Plus: Energy Saving Mode is on by default and turns the outputs off after 12 h under 25 W. Hold the AC and main power buttons for more than 3 seconds ¹⁵.

How we got the runtimes: capacity × 85 % ÷ (500 W + what the station uses on its own). BLUETTI publishes that idle draw: about 10 W for the Elite 200 V2 ¹³ and 20 W for the Apex 300 ¹⁴. For the others we assume 20 W. The 85 % comes from published bench tests ^3,4, and small loads can do worse ⁴. BLUETTI’s own formula is more cautious for the Elite 200 V2: about 3.1 h ¹³.

With normal on-and-off heating, divide by the average draw instead. In the gas-bill example above, 5 kWh a day is about 210 W on average: a 2,048 Wh station then lasts about 7.6 hours and a 3,584 Wh station about 13 hours.

Why switch off the energy-saving modes? Between heating cycles the furnace draws only its standby 4 to 13 W ². A station that sees a small load for long enough may cut its outlets, and the furnace will not restart when the thermostat calls for heat.

Winter detail: the Anker, EcoFlow and both BLUETTI stations do not charge below 32 °F (0 °C) ^11,12,13,14. The Jackery manual rates charging down to −4 °F (−20 °C) ¹⁵. Keep the station inside.

One more check: the Anker C1000 Gen 2 uses a floating ground, and Anker says some devices need a ground-neutral plug, sold separately ¹¹. We could not confirm whether furnace controls are among them; ask your heating contractor.

Stock checked on 2026-11-10: the DELTA 3 Plus was on pre-order in the US, and EcoFlow Canada said it was out of stock until early next year. The Apex 300 was shipping from early December in the US. Check before you count on one.

How to connect it safely

If your furnace plugs into a wall outlet, you can plug it into the station instead. If it has no plug and is wired to a switch on or near it (the service or emergency switch), it is hard-wired. Do not improvise a connection:

• Never plug a power source into a household outlet, and never use a cord with a plug on both ends. BC Hydro warns that a generator connected this way can feed power back into the lines and electrocute neighbours and utility workers ⁸; a power station can do the same.
• Have a licensed electrician make the connection, such as a transfer switch for the furnace circuit. BC Hydro requires a properly installed, CSA-approved transfer switch to connect a generator to house wiring ⁸; we apply the same rule to power stations.
• In Québec, the RBQ requires the appropriate contractor or owner-builder licence for electrical installation work ¹⁶.

A battery station gives off no exhaust, which is why it can sit inside next to the furnace. A gas generator cannot: never run it indoors, in a garage, or near a window, door or vent ^5,6,7. Health Canada says to run it at least 6 metres (20 feet) from buildings ⁵. More in our generator carbon monoxide guide.

What else to power on the same station

Every watt-hour you give another appliance is one the furnace does not get. Two common companions:

• The fridge. The median new full-size ENERGY STAR fridge-freezer uses about 1.3 kWh a day ¹⁷, roughly a quarter of the 5 kWh day of a standard furnace in the gas-bill example above.
• Internet. eero lists its Wi-Fi units at 3.4 to 25 W depending on the model ¹⁸, plus your modem.

To add up your own list, use the power station calculator. For other heating types, see how to heat your house during a power outage. Our method is on the how we research page.