scope:

Defines the specifications and test methods concerning the construction, safety, rational use of energy and fitness for purpose, and also the classification and marking of gas-fired instantaneous water heaters for sanitary uses hereafter called "water heaters". Applies to water heaters: - of types A as, B 11bs, C 11 and C 21;- fitted with atmospheric burners;- using one or more combustible gases corresponding to the three gas families in accordance with table 2 and at the pressures stated in tables 5 and 6 of 3.1.4;- of nominal heat input not exceeding 45 kW;- with an ignition burner or with direct ignition of the main burner. In this European Standard, the heat inputs are expressed in relation to the net calorific value (Hi).