scope:

PREFACE

The standards set forth herein apply to the tenth edition of the Standard for gas Water heaters, Volume III, storage, With Input ratings above 75,000 btu per hour, circulating and instantaneous water heaters, ANSI Z21.10.3-1990, and addenda thereto, Z21.10.3a-1990, and supersede corresponding standards therein. Following their preparation by the supervising subcommittee, they were accepted by accredited standards committee Z21 and subsequently approved as American National Standard by the American national Standards Institute, Inc.

NOTE changes, other than editorial, are denoted by a vertical line in the margin.