N.Y.C. Admin. Code § MC 1005: Section MC 1005: Boiler Connections

1005.1 Valves.

Every boiler or modular boiler shall have a shutoff valve in the supply and return piping. For multiple boiler or multiple modular boiler installations, each boiler or modular boiler shall have individual shutoff valves in the supply and return piping.

Exception: Shutoff valves are not required in a system having a single low-pressure steam boiler of 350,000 Btu/h (103 kW) output or less.

1005.2 Potable water supply.

The water supply to all boilers, including but not limited to backflow prevention, shall be connected in accordance with the New York City Plumbing Code.