10 About the Boiler
The following table lists the product information requirements (EU regulation No 811/2013 and No 813/2013)
KD Navien
Symbol
Unit
NCB-24LDWE
NCB-28LDWE
NCB-34LDWE
NCB-40LDWE
Condensing boiler
YES
YES
YES
YES
Low-temperature (**) boiler
NO
NO
NO
NO
B1 boiler
NO
NO
NO
NO
Cogeneration space heater
NO
NO
NO
NO
Combination heater
YES
YES
YES
YES
Rated heat output
P
rated
kW
20
23
28
33
Seasonal space heating energy
efficiency
η
s
%
92
93
93
93
Useful heat output
At rated heat output
and high-temperature regime (*)
P
4
kW
19.5
23.4
28.3
33.2
At 30 % of rated heat output
and low-temperature regime (**)
P
1
kW
6.5
7.8
9.4
11.1
Useful efficiency
At rated heat output
and high-temperature regime (*)
η
4
%
87.8
87.9
87.9
87.8
At 30 % of rated heat output
and low-temperature regime (**)
η
1
%
97.8
98.1
97.7
98.0
Auxiliary electricity consumption
At full load
elmax
kW
0.036
0.045
0.048
0.045
At part load
elmin
kW
0.014
0.015
0.016
0.016
In standby mode
P
SB
kW
0.003
0.003
0.003
0.003
Other items
Standby heat loss
P
stby
kW
0.080 0.080 0.084 0.084
Ignition burner power
consumption
P
ign
kW
-
-
-
-
Annual energy consumption
Q
HE
GJ
37
43
52
57
Sound power level, indoors
L
WA
dB
50
52
54
52
Emissions of nitrogen oxides
NO
x
mg/kWh
36
38
30
37
For combination heaters
Declared load profile
XL
XL
XL
XL
Daily electricity consumption
Q
elec
kWh
0.307
0.300
0.209
0.214
Annual electricity consumption
AEC
kWh
66
65
45
46
Water heating energy efficiency
η
wh
%
84
84
85
85
Daily fuel consumption
Q
fuel
kWh
22,830
22,718
22,726
22,608
Annual fuel consumption
AFC
GJ
17
17
17
17
Contact details
Navien LTD, 3000 Hillswood Drive, Hillswood Business Park, Chertsey, Surrey, KT16 0RS, UK
(*) 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).
Specific precautions
Read the user’s information and installation manual before the application is assembled, installed or maintained.
Summary of Contents for NCB-24LDWE
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