What are the required label information items on boilers?

The correct choice emphasizes essential information that must be clearly labeled on boilers for safety, operational clarity, and regulatory compliance. The model number and serial number are critical for identifying specific units and tracking them for service and warranty purposes. The hourly rating in BTUs provides necessary information on the capacity and efficiency of the boiler, which is vital for ensuring that it meets heating needs appropriately. The type of fuel used is equally important, as it dictates operational protocols, safety considerations, and environmental regulations. Finally, required clearances inform installers and operators of the safe distances that must be maintained around the boiler to reduce fire hazards and ensure proper airflow and maintenance access.

Each of these items contributes to the safe operation and regulatory compliance of the boiler, ensuring that users can operate them effectively and are informed about maintenance and performance specifications. Other options, while they may contain useful information, do not encompass the full set of critical labeling requirements mandated for safe boiler operation.