3 Mode of operation – Technical data
18
3.3 Technical data
HDG F20/25/30
Type of boiler HDG F20 HDG F25 HDG F30
Performance data (measured according to DIN EN 303-5)
Nominal thermal power 20 kW 25 kW 30 kW
Minimum thermal power 15 kW 15 kW 15 kW
Boiler efficiency at nominal thermal power 93.8 % 93.4 % 93.0 %
Electrical power consumption at nominal
thermal power
78 W 82 W 85 W
Voltage / frequency AC 1 x 230 V / 50 Hz
Back-up fuse 10 A
General boiler data
Boiler class 5
Maximum permissible operating pressure 3 bar
Maximum supply temperature 95 °C*
Minimum return temperature 60 °C
Water capacity 125 l
Fuel chamber capacity 155 l
Weight 670 kg
Layout data for flue calculation (DIN EN 13384-1)
Flue gas temperature (Tw) at
Nominal thermal power / lowest thermal
power
120 °C / 120 °C 130 °C / 120 °C 140 °C / 120 °C
Flue gas mass flow at
Nominal thermal power / lowest thermal
power
0.013 /0.010 kg/s 0.013 / 0.010 kg/s 0.013 / 0.010 kg/s
CO
2
content at
Nominal thermal power / lowest thermal
power
14.2 % / 13.3 % 14.2 % / 13.3 % 14.2 % / 13.3 %
Required flue draught (Pw) 10 Pa 10 Pa 10 Pa
Diameter of flue pipe connection 150 mm
Height to centre of flue gas connecting pipe 1040 mm
Water-side connections
Supply and return connections (bushing) DN 32, inside thread
Safety heat exchanger connections
(bushing)
DN 15, outside thread
Connection for filling/draining (bushing) DN 15, inside thread
Recommended pipe dimensions (minimum) DN 32
Water-side resistance at nominal thermal
power
10 K / 20 K
1600 Pa / 400 Pa 2000 Pa / 500 Pa 2400 Pa / 600 Pa
Table 3/1 - HDG F20/25/30 technical data
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