What is the supply line for unheated water in plumbing?

The supply line for unheated water in plumbing is identified as cold water service. This designation refers specifically to the plumbing system that delivers water intended for use at ambient temperature, which is typically the water supplied to faucets, toilets, and appliances when hot water is not required.

In residential plumbing, the cold water service line is essential for various daily activities, including washing hands, cooking, and drinking. Understanding the difference between hot water service and cold water service is crucial for plumbing installation and maintenance.

When discussing drainage service, it pertains to the pipes that carry wastewater away from fixtures, while recirculation service relates to systems designed to provide instant hot water by returning cooled water in the hot water lines back to the water heater for reheating. Both of these options serve different functions and are not relevant to the supply of unheated water.