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This Part 2-4 of EN 16510 is applicable to hand and automatically fired residential independent boilers (hereafter called appliances) having nominal heat outputs up to 50 kW. The primary function of the appliance is to provide hot water for central heating and/or domestic use. In addition to their primary function of providing hot water these appliances also provide space heating to the place of installation.They are designed for use only with open vented systems at a working pressure not exceeding 2 bar. The appliances can burn one or more types of solid fuels in accordance with the appliance manufacturer's instructions.They can be operated closed and/or open. The appliances are typed according to their tightness depending on their designation in accordance with a possible operation together with a room ventilation system. This standard is not applicable to independent boilers for hot water only production and having heat outputs of less than 5 kW. It is also not applicable to the design and construction of automatic stoking devices.