British Standards Document
BS EN 303-5
Heating boilers. Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW. Terminology, requirements, testing and marking

https://doi.org/10.3403/30345747U

BS EN 303-5 is maintained by RHE/24. The current release of this standard is:

BS EN 303-5:2021+A1:2022 Heating boilers. Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW. Terminology, requirements, testing and marking

https://doi.org/10.3403/30345747 (published 10/01/2022)

This standard is available from the following sources:

Other historical versions of this standard document also exist:

BS EN 303-5:2021 [current until 08/11/2023]
BS EN 303-5:2012 [current until 10/01/2022]
BS EN 303-5:1999 [current until 31/08/2012]