About the Boiler 11
The following table lists the product information requirements (EU regulation No 811/2013 and No 813/2013)
KD Navien
Symbol
Unit
NCB700-2S+/42K
NCB700-3S/54K
Condensing boiler
YES
YES
Low-temperature (**) boiler
NO
NO
B1 boiler
NO
NO
Cogeneration space heater
NO
NO
Combination heater
YES
YES
Rated heat output
P
rated
kW
34.7
34.4
Seasonal space heating energy efficiency
η
s
%
94
94
Useful heat output
At rated heat output
and high-temperature regime (*)
P
4
kW
34.4
34.7
At 30 % of rated heat output
and low-temperature regime (**)
P
1
kW
11.3
11.8
Useful efficiency
At rated heat output
and high-temperature regime (*)
η
4
%
88.7
88.8
At 30 % of rated heat output
and low-temperature regime (**)
η
1
%
98.8
98.5
Auxiliary electricity consumption
At full load
elmax
kW
0.051
0.043
At part load
elmin
kW
0.025
0.020
In standby mode
P
SB
kW
0.003
0.003
Other items
Standby heat loss
P
stby
kW
0.089
0.080
Ignition burner power consumption
P
ign
kW
28
26
Annual energy consumption
Q
HE
GJ
70.3
71.6
Sound power level, indoors
L
WA
dB
51
51
Emissions of nitrogen oxides
NO
x
mg/kWh
22.9
24
For combination heaters
Declared load profile
XXL
XXL
Daily electricity consumption
Q
elec
kWh
0.2
0.2
Annual electricity consumption
AEC
kWh
44
44
Water heating energy efficiency
η
wh
%
85.8
85.7
Daily fuel consumption
Q
fuel
kWh
28.1
28.1
Annual fuel consumption
AFC
GJ
22
22
Contact details
Navien LTD, Building 2, Guildford Business Park, Guildford, GU2 8XH
(*) 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.
