N.Y.C. Admin. Code § PC 501: Section PC 501: General

501.1 Scope.

The provisions of this chapter shall govern the materials, design and installation of water heaters and the related safety devices and appurtenances.

501.2 Water heaters utilized for space heating.

Water heaters utilized both to supply potable hot water and provide hot water for space-heating applications shall be listed and labeled for such applications by the manufacturer and shall be built in accordance with Section IV of the

ASME Boiler and Pressure Vessel Code

with an "H" code stamp. They shall be installed in accordance with the manufacturer's instructions, the

ASME Boiler and Pressure Vessel Code

and the

New York City

Mechanical Code

.

501.2.1 Cross connection.

Water heaters utilized for both potable hot water and hot water for space heating applications shall have separate heating sections and connections for distribution systems and shall not be cross-connected. The potability of the domestic water shall be maintained throughout the system in accordance with

Chapter 6

.

501.2.2 Sizing.

Water heaters utilized for both potable water-heating and space-heating applications shall be sized to prevent the space-heating load from diminishing the required potable water-heating capacity.

501.2.3 Temperature limitation.

Where a combination potable water-heating and space- heating system requires water for space-heating, a temperature actuated mixing valve complying with ASSE 1017 shall be provided to temper the water supplied to the potable hot water

distribution system in accordance with Section

607

.

501.3 Drain valves.

Drain valves for emptying shall be installed at the bottom of each tank-type water heater and hot water storage tank. The drain valve inlet shall be not less than 3/4-inch (19 mm) nominal iron pipe size and the outlet shall be provided with male garden hose threads.

501.4 Location.

Water heaters and storage tanks shall be located and connected so as to provide access

for observation, maintenance, servicing and replacement.

501.5 Water heater labeling.

Water heaters shall be third-party certified.

501.6 Water temperature control in piping from tankless heaters.

The temperature of water from tankless water heaters shall be not greater than 140°F (60°C) where intended for domestic uses. This provision shall not supersede the requirement for protective shower valves in accordance with Section 424.3.

501.7 Pressure marking of storage tanks.

Storage tanks and water heaters installed for domestic hot water shall have the maximum allowable working pressure clearly and indelibly stamped in the metal or marked on a plate welded thereto or otherwise permanently attached. Such markings shall be in an accessible position outside of the tank so as to make inspection or reinspection readily possible.

501.8 Temperature controls.

Hot water supply systems shall be equipped with automatic temperature controls capable of adjustments from the lowest to the highest acceptable temperature settings for the intended temperature operating range.

501.9 Supplemental water-heating devices.

Potable water-heating devices that utilize refrigerant-to-water heat exchangers shall be approved and installed in accordance with this code, the applicable provisions of the

New York City Energy Conservation Code

and the manufacturer's instructions.