AENOR UNE-EN 297/A2/AC:2006 Central heating boilers that use gaseous fuels. Boilers of types B11 and B11bs equipped with atmospheric burners whose nominal heat consumption is equal to or less than 70 kw.
1995AENOR UNE-EN 297:1995 Central heating boilers that use gaseous fuels. Type B boilers equipped with atmospheric burners, whose nominal heat consumption is equal to or less than 70 kW.