Heating boilers - 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 供暖锅炉.带强制通风燃烧嘴器的供暖锅炉.标称热输入量不超过70kw的用雾化油燃烧炉的组合式锅炉的家用热水供热特定要求