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
