Information about the heater
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8
2.10 Technical characteristics
Technical characteristics
Symbol
Units
WR11
WR14
WR18
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/m
3
(9.5 kWh/m
3
)
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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