EN 89:1999

This European Standard 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 "appliance". This standard applies to appliances : of types B11, B11BS, C11, C21 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. This standard does not contain all the requirements necessary for: - appliances fitted with a fan on the combustion circuit; - appliances intended to be connected to a mechanical means of evacuating the combustion products; - appliances which fulfill a dual role of space heating and heating water for domestic hot water use; - appliances with a combustion products discharge safety device other than that for type B11BS appliances; - appliances with electrical combustion products discharge orifice closure device downstream of the heat exchanger fitted to type B appliances and tested as an integral part of the appliance.