WRDB - GB
8
Information about the heater
1.10 Technical characteristics
Technical characteristics Symbol Units WRD11 WRD14 WRD18
Power and flow
Nominal useful power Pn kW 19,2 23,6 30,5
Minimum useful power Pmin kW 7 7 9
Useful power (adjustment range) kW 7 - 19,2 7 - 23,6 7 - 30,5
Nominal thermal flow Qn kW 21,8 27 34,5
Minimum thermal flow Qmin kW 8,1 8,1 10,3
Gas data*
Supply pressure
Natural gas H G20 mbar 20 20 20
LPG (butane/propane) G30/G31 mbar 30/37 30/37 30/37
Consumption
Natural gas H G20 m
3
/h 2,3 2,9 3,7
LPG (butane/propane) G30/G31 kg/h 1,7 2,2 2,75
Number of injectors 12 14 18
Water data
Maximum permissible pressure** pw bar 12 12 12
Temperature selector in fully clockwise position
Temperature rise °C 50 50 50
Flow range l/min 2 - 5,5 2 - 7 2 - 8,8
Minimum operating pressure pwmin bar 0,1 0,1 0,2
Minimum pressure for maximum flow bar 0,25 0,35 0,5
Temperature selector in fully anti-clockwise position
Temperature rise °C 25 25 25
Flow range l/min 4 - 11 4 - 14 4 - 17,6
Minimum operating pressure bar 0,2 0,2 0,2
Minimum pressure for maximum flow bar 0,6 1 1,3
Combustion products***
Minimum low pressure mbar 0,015 0,015 0,015
Flow g/s 13 17 22
Temperature °C 160 170 180
Tab. 4
* Hi 15 °C - 1013 mbar - dry: Natural gas 34.2 MJ/m3 (9.5 kWh/m3)
LPG: Butane 45.72 MJ/kg (12.7 kWh/kg) - Propane 46.44 MJ/kg (12.9 kWh/kg)
** Considering the water dilution effect this value must not be exceeded.
*** For nominal calorific power
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