What is the purpose of a furnace drain pan and how does it contribute to the overall functionality of a heating system?

The purpose of a furnace drain pan is to collect and redirect any water that may leak from the furnace. This helps prevent water damage to the surrounding area and ensures that the furnace operates efficiently by keeping it dry. The drain pan contributes to the overall functionality of the heating system by maintaining a safe and dry environment for the furnace to operate in, reducing the risk of malfunctions and extending the lifespan of the system.