When inspecting a heating system, an inspector is NOT required to report which of the following?

When inspecting a heating system, reporting on the size and age of the system is typically not a requirement for inspectors. While understanding the size and age can provide some context regarding the system's potential efficiency and performance, these details do not directly affect the safety or functionality of the system in a way that necessitates reporting them in an inspection report.

By contrast, the operating efficiency of the system is important as it directly relates to how well the heating system performs, impacting heating costs and effectiveness. The type of fuel being used is also crucial information to convey since it affects both the operation of the system and potential safety hazards linked with gas or electric heating systems. Additionally, the presence of carbon monoxide detectors is critical for homeowner safety, particularly with systems that use gas, which poses risks of carbon monoxide poisoning. Therefore, while size and age may be valuable details, they are secondary to the factors that directly influence safety and functionality, making the reporting of these aspects unnecessary.