1. The document compares different types of pipes used for water supply in residences, including CPVC, composite, PEX, and stainless steel pipes. It analyzes the cost of each type based on typical usage in a house and provides a comparison table. 2. Composite pipes combine advantages of metal and plastic pipes, but are more expensive than CPVC. PEX tubing allows eliminating fittings behind walls but cannot be used outside. Stainless steel is durable but expensive for residential use. 3. Proper design and workmanship are important to ensure long performance of any pipe material. Reasonable consideration should be given to selecting water supply pipes, as they are embedded and difficult to replace, though their cost