UNI EN 15420 : 2011

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification of boilers
5 Constructional requirements
6 Operational requirements
7 Test methods
8 Marking and instructions
Annex A (informative) - National situations
Annex B (informative) - Special national conditions
Annex C (informative) - A-deviations
Annex D (informative) - Classification of type C boilers
Annex E (informative) - Practical method of calibrating
        the test rig to enable the heat loss D[p] to be
        determined
Annex F (informative) - Main symbols and abbreviations
        used
Annex G (informative) - Compilation of test conditions
Annex H (informative) - Valving
Annex I (informative) - Determination of the heat losses
        from the test rig of the indirect method and the
        contributions of the circulating pump of the test
        rig
Annex J (informative) - Means of determining the
        ignition time at full rate
Annex K (informative) - Example of the calculation
        of the NO[x] weighting factors for a boiler with
        several rates
Annex L (informative) - Calculation of conversions
        of NO[x]
Annex M (normative) - Test apparatus for type C2
        boilers
Annex N (informative) - Requirements and test methods
        for separate air supply and combustion products
        evacuation ducts of type C6 boilers
Annex O (informative) - Use of test gases
Annex ZA (informative) - Clauses of this European Standard
         addressing essential requirements or provisions of
         EU Directives
Bibliography

Describes the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan-assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers".