ANSI Z21.10.3-2011/CSA 4.3-2011
Gas Water Heaters - Volume III, Storage Water Heaters With Input Ratings Above 75,000 Btu Per Hour, Circulating and Instantaneous
Product Details
Preface
This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of storage gas water heaters with input ratings above 75,000 Btu per hour. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on storage gas water heaters with input ratings above 75,000 Btu per hour designed for utilization of gas. There are risks of injury to persons inherent in appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this standard are intended to help reduce such risks while retaining the normal operation of the appliance.
Nothing in this standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of storage gas water heaters with input ratings above 75,000 Btu per hour, the safety construction and performance of which may exceed the various provisions specified herein. In its preparation, recognition has been given to possibilities of improvement through ingenuity of design. As progress takes place, revisions may become necessary. When they are believed desirable, recommendations or suggestions should be forwarded to the Chairman of Standards Committee Z21/83, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131, or the Chairman of CSA Technical Committee, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.
Safe and satisfactory operation of storage gas water heaters with input ratings above 75,000 Btu per hour depends to a great extent upon its proper installation, use and maintenance. It should be installed, as applicable, in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54; the Natural Gas and Propane Installation Code, CSA B149.1.
Users of this American National Standard/CSA Standard are advised that the devices, products and activities within its scope may be subject to regulation at the Federal, Territorial, Provincial, state or local level. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this standard, the Federal, Territorial, Provincial, state or local regulation should be followed.
Scope
1.1.1
This standard applies to newly produced, large automatic storage water heaters having input ratings above 75,000 Btu/hr (21 980 W), instantaneous water heaters, circulating water heaters including booster water heaters (see Part IV, 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 liquefied petroleum gases; and
e. For use with LP gas-air mixtures.
f. For recreational vehicle installation for use with liquefied petroleum gases only (see 1.2.26);
g. For manufactured home (mobile home) installation convertible for use with natural gas and liquefied petroleum gases when provision is made for the simple conversion from one gas to the other (see 1.2.25); and
h. For recreational vehicle installation convertible for use with natural gas and liquefied petroleum gases when provision is made for the simple conversion from one gas to the other (see 1.2.26).
i. For use with combination potable water/space heating applications (see 1.2.29 and Part IV, Definition).
Automatic storage water heaters having input ratings of 75,000 Btu/hr (21 980 W) or less are covered in Volume I.
1.1.2
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 shall be subjected to such additional tests as believed necessary at the discretion of the testing agency.
1.1.3
Water heaters for installation in recreational vehicles shall be of the direct vent type.
1.1.4
This standard also applies to water heaters with draft hoods which are factory equipped with automatic vent damper devices (see Part IV, Definitions), hereinafter referred to as vent damper devices.
1.1.5
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 Part IV, Definitions), hereinafter referred to as flue damper devices.
1.1.6
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 1.30.1 and 1.31.1.
1.1.7
All references to psi throughout this standard are to be considered gauge pressures unless otherwise specified.
1.1.8
Exhibit D contains provisions that are unique to the United States.
1.1.9
Exhibit E contains provisions that are unique to Canada.
1.1.10
Special construction provisions applicable to a water heater designed for use with an optional listed conversion kit are outlined under Exhibit F, Optional Provisions of Listed Appliance Conversion Kits.
1.1.11
Exhibit H contains a list of standards specifically referenced in this standard, and sources from which these reference standards may be obtained.
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