HVAC S-2 License Practice Test 2025 – Complete Heating, Piping, and Cooling Prep

In a hydro heat system, CPVC (Chlorinated Polyvinyl Chloride) pipe joints must be joined using solvent cement. This method is specifically designed for CPVC materials, as it creates a strong, permanent bond when applied correctly. The solvent cement works by softening the surfaces of the pipe and fittings, allowing them to fuse together as the solvent evaporates. This ensures that the joints are leak-proof and capable of withstanding the temperatures and pressures found in heating applications.

Other methods such as welding or threading are not appropriate for CPVC pipes, as they do not possess the necessary properties to create effective connections for hydronic heating systems. Using PVC glue is also incorrect because it is formulated for regular PVC and not for CPVC, which requires a different type of solvent cement to achieve a proper joint. Thus, solvent cementing is the standard, reliable practice for ensuring strong and durable connections in CPVC piping in hydro heat systems.