scope:

This standard applies to the following:

a. gas-fired water heaters with a self-contained, temperature- activated primary operating control and not requiring circulation of water for heating (Type I), with rated input no greater than 75,000 Btu/h (22 kW);

b. oil-fired water heaters with a self-contained, temperatureactivated primary operating control and not requiring circulation of water for heating (Type I), with rated input no greater than 105,000 Btu/h (30.8 kW);

c. electric resistance water heaters with a primary self-contained, temperature-activated operating control and not requiring circulation of water for heating (Type I), with rated input no greater than 12 kW;

d. gas-fired water heaters with a self-contained, flow-activated primary operating control and requiring water flow for heating (Type II), with rated input no greater than 200,000 Btu/h (58.6 kW);

e. oil-fired water heaters with a self-contained, flow-activated primary operating control and requiring water flow for heating (Type II), with rated input no greater than 210,000 Btu/h (61.5 kW);

f. electric resistance water heaters with a self-contained, flow-activated primary control and requiring water flow for heating (Type II), with rated input no greater than 12 kW;

g. gas-fired water heaters with a remote temperature-activated primary operating control and requiring circulation through the heater for heating (Type III), with rated input no greater than 75,000 Btu/h (22 kW),

h. oil-fired water heaters with a remote temperature-activated primary operating control and requiring circulation of water through the heater for heating (Type III), with rated input no greater than 105,000 Btu/h (30.7 kW);

i. electric resistance water heaters with a remote temperature- activated operating control and requiring circulation through the heater for heating (Type III), with rated input no greater than 12 kW; and

j. single-phase air-source heat-pump water heaters (Types IV and V), with rated input no greater than 6 kW

PURPOSE

The purpose of this standard is to provide test procedures for rating the efficiency and hot water delivery capabilities of directly heated residential water heaters.