The popular 550TRSI gas fireplace from Heat & Glo features an impressive 78% efficiency rating. It has a realistic campfire log set and it draws 100% of its air from outside, not relying on oxygen from within the room. Its versatility and flexibility allow for easy installation in almost any situation, and the battery back up electronic ignition system eliminates the need for a continuously burning pilot light. With the battery back up, your fire will operate even in a power outage.