Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology, general requirements, testing and marking (EN 303-1:1999 + A1:2003)
Heating boilers - Part 4: Heating boilers with forced draught burners - Special requirements for boilers with forced draught oil burners with outputs up to 70 kW and a maximum operating pressure of 3 bar - Terminology, special requirements, testing and marking
