A plumber is installing a hot water supply line for a radiant heating system using PP-R pipe. What specific type of joining method is typically used and mandated for PP-R pipe in Canada to ensure a homogeneous, leak-free connection?

Question: A plumber is installing a hot water supply line for a radiant heating system using PP-R pipe. What specific type of joining method is typically used and mandated for PP-R pipe in Canada to ensure a homogeneous, leak-free connection?

Answer options: ✅ Heat fusion (socket fusion or butt fusion)

• Solvent welding
• Compression fittings
• Mechanical crimping

Correct answer: Heat fusion (socket fusion or butt fusion)

Explanation: PP-R (Polypropylene Random Copolymer) piping systems are joined through heat fusion, either socket fusion (for smaller diameters) or butt fusion (for larger diameters), which creates a homogeneous, leak-proof joint by melting the pipe and fitting together. Solvent welding is for PVC/ABS, compression fittings are mechanical, and crimping is for PEX or specific flexible connectors.