Pertains to newly produced, large automatic storage water heaters having input ratings above 75,000 Btu/hr (21980 W), instantaneous water heaters, circulating water heaters including booster water heaters, 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; e) for use with LP gas-air mixtures; f) for recreational vehicle installation for use with liquefied petroleum gases only; 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; 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; and i) for use with combination potable water/space heating applications.

Also numbered as CSA 4.3. (06/2001)

ANSI Z21.10.3-2013

ANSI Z21.10.3-2015

CSA 4.3:2014 - Equivalent