scope:

NEN-EN 89 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 European Standard applies to appliances: - of selected types B1, B2, B3, B5, C1, C2, C3, C4, C5, C6, C7, C8, C9 according to CEN/TR 1749; - 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); - fitted with electrically operated mechanical flue dampers that are positioned downstream of the heat exchanger.