NS EN 625 : 1ED 1995

Foreword
1 Scope
2 Normative references
3 Definitions
3.1 Combination boiler
3.2 'Summer' operating mode
3.3 Specific rate
3.4 Nominal domestic hot water heat input
3.5 Maximum water service pressure
3.6 Tank
3.7 Thermal store
3.8 Temperature relief valve
3.9 Proportional control of the domestic hot water
        operation
3.10 Thermostatic control of the domestic hot water
        operation
3.11 Temperature holding thermostat
4 Constructional requirements
4.1 Materials and method of construction of
        components of the domestic water circuit
4.2 Domestic water connections
4.3 Soundness of the domestic water circuit
4.4 Adjusting, control and safety devices for the
        domestic hot water circuit
5 Operational requirements
5.1 General
5.2 Safety of the domestic hot water circuit
5.2.1 Instantaneous and storage types
5.2.2 Instantaneous type
5.2.3 Storage type
5.3 Rational use of energy
5.3.1 Useful efficiency
5.3.2 Losses
5.4 Fitness for purpose
5.4.1 Instantaneous and storage types - Specific rate
5.4.2 Instantaneous type
6 Test methods
6.1 General
6.1.1 Adjustment of the domestic water pressure
6.1.2 Operation of the boiler
6.2 Safety of the domestic hot water circuit
6.2.1 Instantaneous and storage types
6.2.2 Instantaneous type
6.2.3 Storage type
6.3 Rational use of energy
6.3.1 Useful energy
6.3.2 Losses
6.4 Fitness for the purpose
6.4.1 Instantaneous and storage types - Specific
        water rate
6.4.2 Instantaneous type
7 Marking and instructions
7.1 Data plate of the boiler and/or the tank
7.2 Instructions
7.2.1 Technical instructions for the installer
7.2.2 Operating instructions for the user
Annex ZA (informative) Clauses of this European Standard
addressing essential requirements or other provisions
of EU Directives
Figure
1 Illustration of the test tank rig (see 6.3.2.1.3a)