Question

which of the following supply piping materials cannot be used on a hot water system in modern construction? copper, polyethylene, cross linked polyethylene, polybutylene, cpvc

Explanation:

Polyethylene has limitations in high - temperature resistance and may not be suitable for hot water supply systems in modern construction. Copper, cross - linked polyethylene, polybutylene, and CPVC are commonly used for hot water piping due to their heat - resistance properties.

Answer:

polyethylene