The Backburner is the second of three unlockable weapons in the Team Fortress 2 Pyro Update. It is acquired after the player gets the second milestone, 16 achievements as Pyro.
The Backburner gives the Pyro constant critical hits when assaulting an enemy from behind, which can kill even a heavy with 450 health in only seconds. It also deals 10% more damage than the normal flamethrower. The Backburner was given the compression blast ability with the Hatless Update in April 2011: however, it uses 50 ammo rather than the flamethrower's 20 ammo, so you have far fewer chances to use it.
On July 29th, 2008, Valve removed the 50 health point bonus from the Backburner.
The Backburner features fangs and eyes at the front of the weapon which makes it look like a dragon/snake.