EN 656:1999

Gas-fired central heating boilers - Type B boilers of nominal heat input exceeding 70 kW but not exceeding 300 kW EN 656:1999

Publication date:   Jul 7, 2001

General information

99.60 Withdrawal effective   Feb 16, 2022


CEN/TC 109 Central heating boilers using gaseous fuels

European Norm

91.140.10   Central heating systems



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This standard specifies the 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 standard applies to boilers of type B, as listed in 4.2: ð that use one or more combustible gases of the three gas families at the pressures stated in Tables 14 and 15; ð that have a nominal heat input (net CV basis) exceeding 70 kW, but not exceeding 300 kW, including modular boilers; ð where the temperature of the heat transfer fluid does not exceed 105 øC during normal operation; ð where the maximum operating pressure in the water circuit does not exceed 6 bar. The standard applies to boilers designed for sealed water systems or for open water systems. The standard does not contain all the requirements necessary for boilers: ð intended to be installed in the open or in living rooms; ð permanently fitted with more than one flue outlet; ð where the combustion circuit is sealed with respect to the room where the boiler is installed; ð of the condensing type; ð of the low temperature type; ð intended to be connected to a common flue having mechanical extraction; ð fitted with a forced draught burner in accordance with EN 676; ð producing hot water for domestic purposes. This standard only covers type testing.

Related legislation

Legislation related to this standard


Appliances burning gaseous fuels


Efficiency requirements for new hot-water boilers fired with liquid or gaseous fuels


Appliances burning gaseous fuels


Life cycle


EN 656:1999
99.60 Withdrawal effective
Feb 16, 2022


EN 656:1999/A1:2006