DC Class 5A Boiler Operator 25 Horsepower or Less (328) District of Columbia’s 328 exam focuses on compact boiler systems where operator error carries outsized consequences? a single miscalibration in a 25 HP unit serving a small building can cascade into safety violations. The certification distinguishes itself by emphasizing hands-on troubleshooting of low-pressure systems, water treatment chemistry specific to smaller units, and local DC code compliance that differs meaningfully from national standards.
| Exam Name | DC Class 5A Boiler Operator 25 Horsepower or Less |
| Exam Code | 328 |
| Format | PDF & Practice Test Engine |
| Target Year | 2026 Updated |
| Features | 100% Verified Q&As |
