scope:

This standard is for water heaters supplying tepid water to emergency equipment, including eyewash, eye/face wash, emergency showers, and combination units. These water heaters heat the cold water supply to an acceptable tepid temperature within the intended range listed in ISEA Z358.1.

Description

The water heaters shall consist of a cold water inlet connection, a means of heating the water and controlling the discharge temperature, and an outlet connection to supply tepid water to the emergency equipment. The water heater shall also have a means to limit the maximum outlet temperature under normal operating conditions. Provisions shall be made so that the temperature setting of the water heater cannot be inadvertently adjusted.

Maximum Working Pressure

The water heater shall be designed to function at an upper limit working pressure of 100.0 psi (690 kPa) at minimum.

Inlet Temperature Range

The water heater shall be designed for a cold water inlet temperature range that includes 40.0 °F to 70.0 °F (4.4 °C to 21.1 °C).

Outlet Temperature Range

The water heater shall be capable of supplying the emergency equipment with a supply of water within the temperature range of 65.0 °F to 95.0 °F (18.3 °C to 35.0 °C) under normal operating conditions as defined by sections 1.2.2 and 1.2.3.

Minimum Flow

Note per ISEA Z358.1: Water heaters covered by this standard for eyewashes shall operate at a minimum flow rate of 1.5 GPM (5.7 L/min). Water heaters covered by this standard for eye/face washes or combination units shall operate at a minimum flow rate of 3 GPM (11.4 L/min). Water heaters covered by this standard serving only emergency showers shall operate at a minimum flow rate of 20 GPM (75.7 L/min).

The water heater shall be capable of flowing the manufacturer's rated minimum and maximum flow rate for the water heater to deliver tepid water for a period of 15 minutes.

Water Heater Standards

Water heaters shall conform to the safety requirements of the applicable water heater standards. Electrical controls shall comply and be categorized as protective controls with Class B control functions per UL 60730-1 and UL 60730-2-9, or comply with the applicable requirements of UL 353 or UL 873.

A list of non-mandatory recommended standards is given in Annex A. The water temperatures and performance of the water heater shall comply with this standard.

Maximum Time

The outlet water supply shall reach the set temperature within 60 seconds of flow through the water heater at all required flow rates.

Water Heater Failure

Upon failure to heat the water, the supply water shall continue to flow through the outlet of the water heater at a minimum flow rate or greater as required for the emergency equipment.