This is the Small burner that you get at the start.
The Small Burner is the starting burner used in the balloon. It is found next to the balloon at the starting location and must be placed in the Burner Mount before it can be used. Compared to the Big Burner, the Small Burner raises the temperature of the balloon very slowly but uses less fuel. It is ideal for making small adjustments to climb rate and temperature when cruising over long distances. To activate it, the player must left-click on the burner. While holding the left mouse button the player can look around while still using the burner, however it will turn off automaticly if a certain amount of time has passed. Releasing the left mouse button will turn off the burner.