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