scope:

Description

Water heaters covered by this standard have a cold water inlet connection, a means of heating the water, a means of controlling the water temperature, a means of limiting the temperature to a maximum of 120 °F (48.9 °C), and have an outlet connection to connect to downstream fixture fittings. This water heater is intended to supply tempered water at point of use in order to reduce and control the risks of scalding. This water heater is not intended to limit thermal shock.

This water heater is not a substitute for an automatic compensative valve complying with ASSE 1016 / ASME A112.1016 / CSA B125.16.

Connections

Pipe threads and other connections shall comply with the local plumbing codes.

Maximum Working Pressure

The maximum working pressure of the water heater shall be at least at least 150 psi (1034 kPa).

Minimum Flow Rate

The manufacturer shall designate the minimum rated flow rate of water heaters other than those integral to plumbing supply fittings that have a maximum flow rate. The flow rates for water heaters designed into fixture fittings shall be in accordance with ASME A112.18.1 / CSA B125.1.

Maximum Flow Rate

The maximum flow rates of the water heater at given temperature rises shall be included in the manufacturer's literature.

Water Heater Standards

Electrical controls shall comply and be categorized as protective controls with Class B or Class C control functions as defined per UL 60730-1 and UL 60730-2-9, or comply with the applicable requirements of UL 353, UL 795, or UL 873.

Note: An informative list of water heater standards is given in Appendix B.

Outlet Temperature Range

The water heater shall:

1) Be capable of supplying water with a minimum adjustable hot water setpoint range of 100°F to 110°F (37.8°C to 43.3°C)

2) Be set to deliver a maximum water temperature of 120°F (48.9 °C) or less

For non-adjustable water heaters, the outlet temperature shall be set no greater than 110°F (43.3 °C).

Inlet Temperature Range

The water heater shall be capable of operating with inlet water temperatures between 39°F and 80°F (4 °C and 27 °C).

Maximum Permissible Temperature Variation

The water heater shall have a maximum permissible outlet temperature variation based on the water heater's maximum flow rate when tested in accordance with section 3.1.