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2.3 Technical Data
The following table lists the general specifications for the boiler.
Specifications
Heat input range
DHW heat input range
Heat output range @ 80/60°C
DHW output range
Condensing heat output range @ 50/30°C
Full load efficiency at Max./Min. output @ 80/60°C
Full load efficiency at Max./Min. output @ 50/30°C
(condensing)
Partial load (30%) efficiency with 30°C return temp.
Seasonal efficiency rate (SEDBUK 2009)
NOx Classification
Heat output adjustment
Type of heating installation
Max. heating operation pressure
Max. heating temperature
Adjustable heating temperature range
Expansion vessel volume
Expansion vessel pre-charged pressure
Min. DHW working pressure
Min. DHW working flow
Max. DHW working pressure
Adjustable DHW temperature range
DHW flow rate @ 25°C temp. rise.
DHW flow rate @ 35°C temp. rise.
DHW flow rate for kitchen @ 45°C temp. rise.
Gas rate
Gas rate
Electrical power supply
Nominal current
Max. power consumption
Appliance protection rating
Boiler mounting system type
Flue exhaust/Air intake system types
Category
Type
Q
(G20)
max
Q
(G20)
min
Unit
NCB700-2S+/42K
kW
35.0/3.5
kW
40.6/3.5
kW
34.0/3.4
kW
42.0/3.5
kW
37.1
%
98.5
%
107.1
%
109.7
-
93.61
-
-
-
Heating and instantaneous hot water production
-
Adjustable over entire Max./Min. output range
-
bar
°C
°C
L
bar
bar
L/Min
bar
°C
L/Min
24.1
L/Min
17.2
L/Min
13.4
m
/h
3.77
3
m
/h
0.33
3
-
A
0.6
W
130
-
-
-
NCB700-3S/54K
35.0/3.5
52.0/3.5
34.0/3.4
54.0/3.5
37.1
98.6
106.9
109.4
93.51
Class 6
ll2HY203P
Close circuit
2.5
90
40-90*
10
1
0.5
2.0
10.0
30-65
31.0
22.1
17.2
4.83
0.33
230V / 50Hz
0.7
150
IPX4D
Wall-mounted
B23, C13, C33, C53
About the Boiler
9
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