BS EN 303 discusses heating boilers. BS EN 303-6 is the sixth part of BS EN 303 multi-series and discusses domestic hot water operation and energy performance of water heaters with atomizing oil burners of nominal heat input not exceeding 70 kW. BS EN 303-6 is composed of two parts.
The first part supplements EN 303-1, EN 303-2, EN 303-4, and EN 304, hereafter called boiler standards. BS EN 303-6 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 water heaters and combination boilers. The second part covers the energy performance of domestic hot water production of the appliances covered by the first part.
The heat output of the appliances covered by BS EN 303-6 does not exceed 400 kW. In the case of combination boilers, with or without storage tanks, domestic hot water production is integrated or coupled, the whole being marketed as a single unit. BS EN 303-6 only covers type testing.
BS EN 303-6 on heating boilers is useful for:
Boilers are special-purpose water heaters. While furnaces carry heat in warm air, boiler systems distribute the heat in hot water, which gives up heat as it passes through radiators or other devices in rooms throughout the house.
BS EN 303-6 provides a method for assessing the energy performance of the appliances. It defines a number of daily tapping cycles for each domestic hot water use such as kitchen, shower, bath, and a combination of these, together with corresponding test procedures, enabling the energy performances of combination boilers and water heaters to be compared and matched to the needs of the user.
BS EN 303-6:2019 supersedes BS EN 303‑6:2000, which is withdrawn. BS EN 303-6:2019 includes some technical changes with respect to BS EN 303‑6:2000. These include:
EN 303-6