Most gas appliances in your home need electricity to function, even though the fuel itself is gas. The exceptions are few but worth knowing: gas stovetop burners, older water heaters with standing pilot lights, and millivolt gas fireplaces can all work without power. Nearly everything else, including your gas furnace, gas oven, and tankless water heater, will not.
The reason comes down to how modern gas appliances are designed. They rely on electric ignition systems, blower motors, sensors, and safety valves that all require household current. Gas is the heat source, but electricity is what controls it.
Gas Stovetop Burners: Yes, With a Match
Gas stovetop burners are the most reliable gas appliance during a power outage. Even though they normally use electronic igniters (that clicking sound when you turn the knob), you can light them manually with a long match or lighter. Turn the burner knob to low, hold a flame near the edge of the burner ring, and the gas will ignite. Light each burner individually.
There are a few important caveats. Without electricity, there’s no automatic reignition, so if a draft blows the flame out, gas will continue flowing with no flame to burn it. Stay in the kitchen and monitor the burner closely. Also, only light the surface burners this way. Do not attempt to manually light the oven, a griddle, a French top, or a charbroiler, as these are higher-output components where it’s harder and more dangerous to reach the ignition area. And don’t use your burners to heat the kitchen, since that creates a carbon monoxide risk in an enclosed space.
Dual fuel ranges (gas burners with an electric oven) will give you working stovetop burners but no oven at all during an outage, since the oven runs on electricity. Some newer models with electronically activated gas solenoid valves cannot be manually lit at all, so check your owner’s manual before assuming you can light yours.
Gas Ovens: No
Modern gas ovens will not work without electricity. They use a hot surface ignition system: when you set a temperature, the thermostat sends electrical current to a glow-bar igniter, which heats up until it’s hot enough to open a safety valve and ignite the gas. Without 120-volt power, the igniter can’t heat, the safety valve stays shut, and no gas flows. This is a deliberate safety feature. There’s no way to bypass it with a match, and you shouldn’t try.
Gas Furnaces: No
A gas furnace cannot heat your home during a power outage. The gas burner is only one part of the system. The blower motor that pushes warm air through your ducts accounts for about 80% of a furnace’s total electricity consumption. On top of that, most modern furnaces use electronic ignition, a draft inducer fan that vents combustion gases, and various safety sensors, all of which require electricity. Without power, the furnace won’t even attempt to start a heating cycle.
Even older gravity-fed systems (like hot water radiators with no circulation pump) still typically need electricity for the thermostat, which usually runs on 24-volt AC power supplied through a transformer connected to your home’s electrical system. Battery backups for thermostats exist but won’t help if the furnace itself needs power for its controls and safety valves.
Gas Water Heaters: It Depends on the Type
Traditional tank water heaters with a standing pilot light are one of the few gas appliances that work completely without electricity. The pilot light burns continuously, and when the water temperature drops, a thermocouple-activated valve opens to let gas flow to the main burner. No electrical connection is involved at any point. If you have one of these, you’ll still have hot water during an outage (until the tank runs out and needs to reheat).
Newer tank water heaters with electronic ignition need electricity to fire up and won’t work during an outage. You can usually tell which type you have by checking whether your water heater is plugged into an outlet or has an electrical connection.
Tankless (on-demand) gas water heaters will not work without power, regardless of ignition type. Even models with a standing pilot light need electricity to run flow sensors, circuit boards, and exhaust fans that are part of the combustion process. When you open a hot water tap, the unit’s electronics detect the flow and control the gas valves. Without electricity, nothing happens.
Gas Fireplaces: Only Millivolt Models
Whether your gas fireplace works in an outage depends entirely on the ignition system. Older millivolt (standing pilot) fireplaces work perfectly without electricity. A small pilot flame burns continuously and generates a tiny electrical charge, measured in millivolts, that holds the gas valve open. This self-generated power means your wall switch or remote operates normally during an outage. Just flip it on.
Newer electronic ignition fireplaces, and any model with a blower fan, need household power. The fireplace itself may not light, and even if it does, the fan that distributes heat into the room won’t run. Some newer units offer battery backup systems, but these aren’t standard.
Gas Grills: Mostly Yes
Outdoor gas grills are largely independent of household electricity. The burners run entirely on propane or natural gas, and many models use a simple battery-powered spark igniter (typically a single 9-volt battery) rather than household current. If the igniter battery dies, you can light the burners with a long match, just like a stovetop.
The features that do need electricity are accessories: motorized rotisseries typically require a 120-volt outlet, and built-in grill lights need power. But the core grilling function works fine without plugging anything in.
Why Modern Gas Appliances Need Electricity
The shift away from standing pilot lights explains most of this. Pilot lights waste energy, burning gas 24 hours a day whether or not the appliance is in use. A standing pilot on a water heater can cost $12 to $20 per year in gas alone. Electronic ignition is more efficient, but it introduced a dependency on electricity that older appliances didn’t have.
Safety systems are the other factor. Modern gas appliances use electrically controlled solenoid valves, combustion fans, and flame sensors that shut off gas flow if something goes wrong. These protections are valuable, but they mean the appliance is effectively disabled without power.
Staying Safe During an Outage
If you’re using any gas appliance without electricity, carbon monoxide is your primary concern. CO detectors that plug into the wall may lose their backup battery charge within a month if they’ve been running on battery alone, so check that yours are working. Never use a gas stovetop, oven, or grill to heat your home. Open a window slightly in any room where you’re burning gas for cooking. Keep flames attended at all times, since the automatic safety reignition features on your appliances won’t function without power.