UNI EN 303-3 : 2007

Foreword
1 Scope
2 Normative references
3 Definitions
4 Assembly requirements
5 Operational requirements
6 Test methods
7 Instructions
Annex A (informative) Diameters of combustion products
                      evacuation ducts marketed in the
                      various countries
Annex B (informative) Practical method of calibrating the
                      test rig to enable determination of
                      heat loss D[p]
Annex C (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 D (informative) Determination of the ignition time at
                      full rate
Annex E (normative) Assembly criteria
Annex F (informative) Ranges of boilers
Annex G (normative) Case of a boiler body which has already
                    been tested with a liquid fuel burner in
                    accordance with EN 303-1, EN 303-2 and EN 304
Annex ZA (informative) Clauses of this European Standard
                       addressing essential requirements or
                       other provisions of EU Directives

Defines the requirements and test methods for the construction, the safety and the rational energy usage of an assembly made up of a boiler body complying with EN 303-1 and a forced draught gas burner complying with EN 676, using combustible gases, hereafter referred to as a "boiler".