scope:

This Part of the European Standard EN Generic Standard specifies the common requirements and test methods concerning, in particular the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers". This European Standard is to be used in conjunction with the specific Parts 2-1 and following ones. This standard applies to boilers of types B and C, according CR 1749: - that use one of more combustible gases of the three gas families at the pressures stated in EN 437; - where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation; - where the maximum operating pressure in the water circuit does not exceed 6 bar; - which can give rise to condensation under certain circumstances. The standard applies to boilers designed for sealed water systems or for open water systems. This general standard and the specific standards provide requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard or a specific standard, the risk associated with this alternative construction shall be assessed. An example of an assessment methodology, based upon risk assessment and which covers the essential requirements of the GAD, is given in clause 11. This standard covers only type testing.