An electric fireplace runs on electricity, which is less expensive as compared to fuel and gas both. The heat is adjustable and can be set accordingly. This benefit was never available in traditional style as there was little control over how the fire looks. The fireplace is not heated up after usage, which reduces the chances of getting burnt accidentally. Especially with small children and pets, this is a significant advantage.
Aside from keeping the warm air from escaping, the doors act to keep the hearth clean just as a fireplace screen used to do in the olden days. With the doors closed, ashes and embers don't scatter about the room, keeping the carpet or rug clean and scorch-free. The doors also have built in devices that divert air towards the bottom of the fireplace. These vents make the fire burn brighter and easier to light.