SR EN 303-5:2021

1.1 General This European Standard applies to heating boilers including safety devices up to a nominal heat output of 500 kW which are designed for the burning of solid fuels only and are operated according to the instructions of the boiler manufacturer. This European Standard deals with significant hazards, hazardous situations and events relevant to heating boilers used as intended and under the conditions foreseen by the manufacturer (see Clause 4). The boilers may operate under natural draught or forced draught. The stoking may work manually or automatically. The boilers may operate under room sealed conditions in case of supervised under pressure in the combustion chamber. The boilers may operate in condensing condition. NOTE This European Standard deals with boilers which are both within and outside of the scope of the Machinery Directive 2006/42/EC. This European Standard contains requirements and test methods for safety, combustion quality, operating characteristics, marking and maintenance of heating boilers and secondary emission reduction appliances and efficiency