The Fire (or "fireplace") is a type of Obstacle in The Binding of Isaac: Rebirth (TBOIR)
Fires can be extinguished by shooting them with tears, or using bombs
There is a small chance fires will drop coins/hearts/bombs when put out
Touching a fire causes you to lose one-half heart in health.
Most fires you will encounter are regular fires, but there are other types of fires such as the Blue Fire that have different features.