8402 - Steam or other vapor generating boilers (other than central heating hot water boilers capable also of producing low pressure steam); super-heated water boilers; parts thereof:

This HTS category, 8402, encompasses boilers designed for generating steam or other vapor, specifically excluding those solely intended for central heating hot water systems that can also produce low-pressure steam. It also includes boilers designed for super-heated water. These are substantial pieces of industrial or commercial equipment used to heat water to produce steam or very hot water under pressure, primarily for power generation, industrial processes, sterilization, or other applications requiring high temperatures and pressures.

Distinguishing this category from its siblings at the same level is crucial. While other categories within Chapter 84 might cover related machinery, 8402 is specifically focused on the boiler apparatus itself. For instance, it would not include the turbines that utilize the steam generated by these boilers, nor would it include the pumps that feed water into them, unless those components are considered integral parts classified under 8402.90.00.

Within the 8402 code, further subcategories provide for more precise classification. The primary distinction lies between general steam or vapor generating boilers and super-heated water boilers, recognizing the different operational characteristics and applications of each. Additionally, a separate provision exists for parts of these boilers, allowing for the classification of components such as tubes, headers, insulation, and control systems when imported separately.