Our wood and even gas units will function during a power outage! Our wood units require no electrical connection to run at all. The only element that will not function during a power outage is the blower, which is often an optional accessory. As for gas, units with millivolt ignition also require no electricity at all. However, even our units with electronic ignition feature a battery backup that will ensure you can use the unit in the event of a power outage. Like wood, the blower does not work without an electrical hookup. The only fuel source that will not function during a power outage is pellet. This is because a pellet unit works purely through its moving parts and motorized air flow; without electricity these functions cannot take place.