What is the minimum water pressure required for effective plumbing systems per the code?

The minimum water pressure required for effective plumbing systems, as specified in the National Plumbing Code of Canada, is 275 kPa (40 psi). This pressure ensures that there is sufficient flow and pressure to deliver water effectively to all fixtures within a plumbing system. Adequate water pressure is crucial for the proper performance of faucets, showers, and toilets, and it helps facilitate the movement of water through the pipes under normal operating conditions.

A lower pressure, such as 200 kPa or 250 kPa, may lead to insufficient flow rates, affecting the performance of plumbing fixtures. Similarly, while 300 kPa represents a pressure that exceeds the minimum requirement, it could potentially result in issues such as water hammer or increased stress on the plumbing system. Therefore, the code specifies 275 kPa as the standard that strikes a balance between effective operation and system integrity.