§ 18-29-503.1 Cold water line valve.
The cold water branch line from the main water supply line to each hot water storage tank or water heater shall be provided with a valve accessible on the same floor, located near the equipment and only serving the hot water storage tank or water heater. The valving shall not interfere or cause a disruption of the cold water supply to the remainder of the cold water system.
§ 18-29-503.1.1 Shutoff valves.
Shutoff valves for water heaters or heated water storage tanks may be installed on the inlet side only. This discharge side may be provided with a check valve or a three-way valve installed to open the heater to the atmosphere when it is not in the operating position. The atmospheric opening of a three-way valve shall be indirectly connected to the drainage system.