TS prEN 303-5

TS prEN 303-5 is a terminology, requirements, testing and marking standard for heating boilers with a nominal heat output up to 300 kW that are designed to burn solid fuels only. The product group covered here includes boilers operated according to the manufacturer’s instructions and working with either negative pressure or positive pressure in the combustion chamber, so the way combustion air and flue-gas flow are managed is central to the subject.

Boiler type and operating arrangement

The standard focuses on defining and comparing solid-fuel heating boilers in a consistent technical way. Solid fuel is a broad engineering category that typically includes fuels such as coal and wood. The distinction between hand-fired and automatically fired equipment matters because it affects how fuel is supplied and how combustion is initiated and sustained. Negative-pressure and positive-pressure combustion arrangements describe different pressure conditions inside the combustion chamber, which influence draft control and the overall boiler design.

Terminology, requirements, testing and marking

As a terminology and marking standard, this document supports a common technical language and provides a framework for identifying the product, considering relevant design and performance requirements, and using appropriate test concepts. In general technical practice, standards of this kind help make manufacturer data, product markings and test results more comparable across suppliers. The exact content of this listing, however, should be understood within the boundaries confirmed by the title and scope only.

This record is for a withdrawn TSE edition, so it should be read as a definition of the subject area rather than as an active market reference. It sets the boundary for this class of boilers and does not claim coverage of other heating systems or fuel categories.