ASME Section IV applies to which equipment?

• A. Heating boilers
• B. Nuclear reactors
• C. Gas turbines
• D. Water heaters

Answer: (A)

Section IV covers heating boilers—the equipment used to provide space heating and hot water in buildings. It sets the rules for the design, materials, fabrication, inspection, testing, and stamping of those low‑pressure boilers. This is a distinct scope from other BPVC sections: nuclear reactors fall under Section III, while gas turbines aren’t boilers and aren’t governed by the heating-boiler rules. Domestic water heaters, if they are classified as heating boilers for the purpose of the code, would fall under this same section, but the primary focus is on heating boilers. So the best match for what Section IV applies to is heating boilers.