ÖNORM EN 303-6

This standard supplements EN 303-1, EN 303-2, EN 303-4 and EN 304/A1 hereafter called boiler standards. It specifies 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 oil-fired combination boilers of nominal heat output not exceeding 70 kW. The domestic hot water is produced on either the instantaneous or storage principle. The domestic hot water production is integrated or coupled, the whole being marketed as a single unit. This standard does not apply to appliances which operate independently of each other - a boiler and a water heater - even if they have a common flue. Neither does the standard apply to a boiler and water storage tank which are not included within the same casing. This standard only covers type testing.