What does "bonnet capacity" refer to in a gas furnace?

Bonnet capacity in a gas furnace refers to the furnace output measured in BTUs (British Thermal Units). This term specifically describes the total amount of heat that the furnace can deliver to the heated space. Understanding bonnet capacity is crucial for ensuring that the furnace is appropriately sized for the space it is intended to heat, which directly impacts efficiency, comfort, and safety in operation.

In terms of system performance, an adequately rated furnace will maintain a comfortable temperature without excessive cycling on and off, leading to better energy efficiency and potentially extending the lifespan of the equipment. Proper knowledge of bonnet capacity helps technicians make informed decisions about installation and maintenance to ensure optimal heating performance.