DS EN 303-5:2012 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 Pertains 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