Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology, general requirements, testing and marking; German version EN 303-1:1999— 19 стр.
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; German version EN 303-4:1999— 20 стр.
Heating boilers - Part 5: Heating boilers for solid fuels, hand and automatically stocked, nominal heat output of up to 300 kW - Terminology, requirements, testing and marking; German version EN 303-5:1999— 30 стр.