DS EN 303-6:2000 Heating Boilers - Part 6: Heating Boilers With Forced Draught Burners - Specific Requirements For The Domestic Hot Water Operation Of Combination Boilers With Atomizing Oil Burners Of Nominal Heat Input Not Exceeding 70 Kw Defines the supplementary requirements and tests for the construction, safety, rational use of energy, fitness for purpose, classification and marking related to the domestic hot water operation of oi