This fourth course in a four-course series on heating and ventilating for the secondary/postsecondary level is one of a number of military-developed curriculum packages selected for adaptation to vocational instruction and curriculum development in a civilian setting. The four lessons in the course cover these topics: (1) Feed-Water, Condensate, and Pump Systems; (2) Treatment of Boiler Water; (3) Steam Plants; and (4) Steam Distribution. Designed for student self-study and evaluation, the course materials consist of a text and a student workbook. The text contains the reading assignments. Materials found in the workbook are lesson objectives, text assignments, lesson review exercises, answers to the exercises, and a discussion of those answers. A course examination is provided, but no answer key is included. The course may be used for remedial or independent study. (YLB)