Draft Details

1.1 Inclusions

This Standard applies to newly produced, automatic storage water heaters having input ratings of 75,000 Btu/hr (21 980 W) or less (see Clause 3, Definitions), hereinafter referred to as water heaters or appliances, constructed entirely of new, unused parts and materials:

a) for use with natural gas;

b) for use with manufactured gas;

c) for use with mixed gas;

d) for use with propane;

e) for use with LP gas-air mixtures;

f) for recreational vehicle installation for use with propane only (see Clause 4.1.26);

g) for manufactured home (mobile home) or park model trailer installation,

i) for use with natural gas only.

ii) for use with propane only, and

iii)  convertible for use with natural gas and propane when provision is made for the simple conversion from one gas to the other (see Clause 4.1.25);

h) for recreational vehicle installation convertible for use with natural gas and propane when provision is made for the simple conversion from one gas to the other (see Clause 4.1.26); and

i) for use with combination potable water/space heating applications (see Clause 4.1.29 and Clause 3, Definitions).

1.2 Water heaters with heat pipe heat exchangers

This Standard also applies to water heaters incorporating heat pipe heat exchangers (see Clause 4.4, Heat pipe heat exchangers).

1.3 Direct vent water heaters

Direct vent water heaters anticipated by this Standard are essentially balanced flue appliances with the air intake and vent outlet in close proximity. Other designs are to be subjected to such additional tests as may be determined by the certification body.

1.4 Water heaters for recreational vehicles

Water heaters for installation in recreational vehicles are to be of the direct vent type.

1.5 Water heaters with draft hoods and vent damper devices

This Standard also applies to water heaters with draft hoods which are factory-equipped with automatic vent damper devices (see Clause 3, Definitions), hereinafter referred to as vent damper devices.

1.6 Water heaters with automatic flue damper devices

This Standard also applies to water heaters of other than the direct vent type which are factory-equipped with electrically operated or mechanically actuated automatic flue damper devices (see Clause 3, Definitions), hereinafter referred to as flue damper devices.

1.7 Measurement values and units

If a value for measurement as given in this Standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification, except as noted in Clauses 4.33.2 and 4.34.2.

1.8 Pressure references

All references to “psi” throughout this Standard are to be considered gauge pressures unless otherwise specified.

1.9 Items unique to the United States

Clause 7, Items unique to the United States, contains provisions that are unique to the United States.

1.10 Items unique to Canada

Clause 8, Items unique to Canada, contains provisions that are unique to Canada.

1.11 Optional provisions for listed appliance conversion kits

Special construction provisions applicable to a water heater designed for use with an optional listed conversion kit are outlined under Annex F, Optional provisions for listed appliance conversion kits.

1.12 Reference publications

Clause 2, Reference publications, contains a list of standards specifically referenced in this Standard, and sources from which these reference standards may be obtained.

1.13 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designed normative (mandatory) or informative (non-mandatory) to define their application.