NF EN 677 : 1998

Foreword
1 Scope
2 Normative references
3 Definitions
    3.1 condensing boiler
    3.2 condensate
    3.3 nominal condensing output
    3.4 maximum allowable working temperature
4 Constructional requirements
    4.1 Materials in contact with condensate
    4.2 Removal of condensate
    4.3 Control of the combustion products temperature
    4.4 Chemical composition of the condensate
5 Operational requirements
    5.1 General
    5.2 Verification of the nominal condensing output
    5.3 Formation of condensate
    5.4 Temperature of combustion products
    5.5 Combustion
    5.6 Efficiencies
6 Test methods
    6.1 General
    6.2 Verification of the nominal condensing output
    6.3 Formation of condensates
    6.4 Temperature of combustion products
    6.5 Combustion
    6.6 Efficiencies
7 Marking
    7.1 Data plate
    7.2 Instructions
Annex A (normative) Correction for the determined efficiency
in the low water temperature test of condensing boilers
Annex B (informative) Special national conditions
Annex C (informative) A-deviations
Annex ZA (informative) Clauses of this European Standard
addressing essential requirements or other provisions of
EU Directives

Applicable to gas-fired central heating boilers, known as "condensing boilers" of types B (not including appliances without a fan) and to those using one or more gases corresponding to the three gas families and where the nominal heat input is not in excess of 70 kW.