New Standard from Last Update.

1. Scope

1.1 This standard cover the requirements for instantaneous domestic water heater of nominal useful heat output less than 25 kW (based on gross calorific value), for use with Piped Natural Gases (PNG) at a working pressure of 21 mbar (21.41 gf/cm2). It is an inlet water controlled appliance. It specifies the main constructional and performance characteristics for the instantaneous domestic water heater. It also sets the appropriate test methods for evaluating test characteristics. Appliances for boiling water are not covered in this standard.

NOTE — For calculation 1 Kcal/h = 1.16278 watt.

1.1.1 For convenience, this standard has been divided into three sections as follows:

a) Section 1 — Construction,

b) Section 2 — Performance requirements, and

c) Section 3 — General

2. References

The following standards contain provisions, which through reference in this text constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

554 : 1999 Pipe threads where pressure-tight joints are made on the threads — Dimensions, tolerances and designation ( fourth revision)

2305 : 1988 Method for mercurous nitrate test for copper and copper alloys ( first revision)

5116 : 1996 Domestic and commercial equipment for use with LPG — General requirements (third revision)

6480 : 1988 Glossary of terms relating to domestic and commercial gasburning appliances ( first revision)