Current through Register Vol. 50, No. 9, September 20, 2024
A. Scope. The
provisions of this Chapter shall govern the materials, design, and installation
of water heaters.
B. Working
Pressure Identification. All storage tanks and water heaters shall be clearly
and indelibly marked showing the allowable safe working pressure.
C. Water Heater as Space Heater. A water
heater may be used as a part of a space heating system if the outlet water
temperature of the water heater does not exceed 160°F (71°C) and the potability
of the water is maintained throughout the system.
D. Sediment Drains. A suitable water valve or
cock, through which sediment may be drawn off or the heater or tank emptied,
shall be installed at the bottom of the heater or tank.
E. Location. The following applies to the
location of water heaters and/or associated storage tanks.
1. Water heaters and storage tanks shall be
so located and connected that they will be accessible for observation,
maintenance, servicing and replacement.
2. Gas water heaters in residential garages
shall be installed so that all burners and burner ignition devices are located
not less than 18 inches above the floor.
3. Gas water heaters shall be located, or
reasonably protected, so that they are not subject to physical damage by a
moving vehicle.
4. Every attic or
furred space in which water heaters and/or storage tanks are installed shall be
readily accessible by an opening and passageway as large as the largest piece
of equipment and in no case less than 22 x 36 inches (559 x 914 mm) continuous
from the opening to the equipment and its controls. The opening to the
passageway should be located not more than 20 ft (6096 mm) from the equipment
measured along the center line of such passageway. Every passageway shall be
unobstructed and shall have solid continuous flooring not less than 24 inches
(610 mm) wide from the entrance opening to the equipment. On the control side
and on other sides where access is necessary for servicing of equipment, a
level working platform extending a minimum 30 inches (762 mm) from the edge of
the equipment with a 36 inch (914 mm) high clear working space shall be
provided.
F. Marking.
All water heaters and associated storage tanks shall comply with the following
marking requirements.
1. Water Heaters. All
water heaters shall bear the following, or equal wording on a visible decal or
label by the manufacturer:
There shall be installed at time of heater installation a
combination temperature and pressure relief valve, selected and located in
conformance with the requirements of ANSI Z21.22 or CSA 4.4M.
2. Pressure Marking of Storage Tanks. Any
storage tank installed for domestic hot water shall have clearly and indelibly
stamped in the metal, or so marked upon a plate welded thereto or otherwise
permanently attached, the maximum allowable working pressure. Such markings
shall be in an accessible position outside of the tank so as to make inspection
or reinspection readily possible. All unlisted storage tanks for domestic hot
water shall meet the applicable ASME standards.
AUTHORITY NOTE:
Promulgated in accordance with
R.S.
40:4(A)(7) and
R.S.
40:5(2)(3)(7)(9)(16)(17)(20).
