Gas Heat ESCO Practice Exam 2025 – Comprehensive All-in-One Guide for Exam Success!

The term "bonnet capacity" of a furnace refers specifically to the input BTUs, which is the amount of gas the furnace consumes to produce heat. This measurement indicates the fuel input capability of the furnace, essentially showing how much energy is available for heating from the gas being supplied.

Understanding this concept is crucial in assessing the operational capability of the furnace, as it directly impacts the heating output and efficiency. Knowing the input BTUs helps in evaluating the furnace's design and its suitability for different heating requirements.

While the other options relate to different aspects of a furnace's performance or operation, they do not describe the "bonnet capacity." The BTU output pertains to the amount of heat produced, efficiency relates to how well the furnace converts gas consumption into heat, and fan speed deals with the airflow rather than gas consumption metrics. Hence, the best understanding of "bonnet capacity" focuses on the input BTUs.