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A C-4 Boiler, Hot Water Heating and Steam Fitting license (16 CCR §832.04) authorizes work on power boilers, hot-water heating systems, steam piping, and the pumps, valves, and radiators tied to them. Because boilers are pressure equipment rather than fuel-burning comfort appliances, CSLB treats C-4 as its own classification rather than folding it into C-20 (HVAC) or C-36 (Plumbing). This course covers the CSLB-outline C-4 trade exam plus Law & Business: a full study guide, 4 practice exams, and an explanation for every answer. Read the full C-4 License Guide for the boundary vs. C-20/C-36 and complete licensing requirements.