
FAMILY
36
Parameter
Symbol
Family Cx 25 IS Family Cx 35 IS
Unit
Seasonal space heating energy efficiency class
-
A
A
-
Water heating energy efficiency class
-
-
-
-
Rated heat output
Pnominal
19
29
kW
Seasonal space heating energy efficiency
ηs
93
93
%
Useful heat output
At rated heat output and high-temperature regime (*)
P4
19,5
29,2
kW
At 30% of rated heat output and low-temperature regime (**)
P1
6,5
9,7
kW
Useful efficiency
At rated heat output and high-temperature regime (*)
η4
87,6
87,8
%
At 30% of rated heat output and low-temperature regime (**)
η1
97,7
97,5
%
Auxiliary electricity consumption
At full load
elmax
28,0
28,0
W
At part load
elmin
14,0
14,0
W
In Stand-by mode
PSB
3,0
3,0
W
Other parameters
Stand-by heat loss
Pstby
34,0
32,0
W
Pilot flame energy consumption
Pign
-
-
W
Annual energy consumption
QHE
36
53
GJ
Sound power level, indoors
LWA
50
52
dB
Emissions of nitrogen oxides
NOx
46
37
mg/kWh
For combination heaters
Declared load profile
-
-
Water heating energy efficiency
ηwh
-
-
%
Daily electricity consumption
Qelec
-
-
kWh
Daily fuel consumption
Qfuel
-
-
kWh
Annual electricity consumption
AEC
-
-
kWh
Annual fuel consumption
AFC
-
-
GJ
(*) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet.
(**) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).