Third edition of BiH standard BAS EN 303-5: 2021, Heating boilers - Part 5: Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW - Terminology, requirements, testing and marking, has been adopted by the translation method through the Technical Committee BAS/TC 47, Appliances and systems for heating and refrigeration and systems, of the Institute for Standardization of BiH.

The original text of this European standard was prepared by the Technical Committee CEN/TC 57, Central heating boilers, whose secretariat is held by the German national standardization body DIN.

BAS EN 303-5: 2021 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 related to heating boilers used as intended and under the conditions foreseen by the manufacturer. The boilers may operate under natural draft or forced draft. The stoking may work manually or automatically.

This European Standard contains requirements and test methods for safety, combustion quality, operating characteristics, marking and maintenance of heating boilers. It also covers all external equipment that influences the safety systems (e.g. back burning safety device, integral fuel hopper). Also, the standard applies only to boilers that contain burners and together form a whole. The standard applies to the combination of a boiler body with a solid fuel burner according to EN 15270 as a unit only when the whole unit is tested in accordance with this European Standard. Heating boilers in accordance with this European Standard are designed for central heating installations where the heat carrier is water and the maximum allowable temperature is 110° C, and which can operate at a maximum allowable operating pressure of 6 bars. For heating boilers with a built-in or attached water heater (storage or continuous flow heater), this European Standard only applies to those parts of the water heater which are necessarily subject to the operating conditions of the heating boiler.