scope:

Defines the specifications and test methods for the construction, safety, rational use of energy and fitness for purpose, environment and classification and marking of gas-fired storage water heaters for domestic hot water uses, hereafter called "appliances". Applies to appliances of types B11, B11bis, C11, C12 and C31; - fitted with atmospheric burners; using one or more combustible gases corresponding to the three gas families and the pressures indicated in EN 437; - of nominal heat input not exceeding 150 kW (net calorific value); - using or not the water condensation heat in the combustion products; - appliances whether subject to the water mains pressure or open circuit.