Which ASME code section outlines the construction requirements for heating boilers?

The correct choice highlights that Section IV of the ASME code specifically deals with the construction requirements for heating boilers. This section is dedicated to establishing the standards for the design, fabrication, installation, and inspection of heating boilers, which are intended to operate in low-pressure conditions. These requirements ensure that heating boilers are built safely and reliably to handle the specified operating conditions.

Section IV's focus on heating boilers differentiates it from other sections of the ASME code. For example, Section I pertains to the construction of power boilers, which operate at higher pressures and have different requirements. Section III addresses nuclear facility components and their associated safety standards, while Section VI covers recommended rules for feedwater heaters. Therefore, understanding the specific context of Section IV clarifies its relevance to heating boilers and reinforces why it is the appropriate reference for their construction requirements.