10 About the Boiler
1.3 Technical Data
The following tables list the general specifications for the boiler.
Specifications
Unit
NCB-24LSWE NCB-28LSWE NCB-34LSWE NCB-40LSWE
Heating consumption (Max/Min)
kW
20.0/4.2
24.0/4.2
29.0/5.1
34.0/4.0
DHW heat consumption (Max/Min)
kW
24.0/4.2
28.0/4.2
34.0/5.1
40.0/4.0
Heating output (Max/Min) at 80/60°C
kW
19.6/3.9
23.6/3.9
28.6/4.9
33.5/3.9
DHW output (Max/Min)
kW
20.0/4.0
24.0/4.0
34.0/5.0
40.0/4.0
Condensing heating output (Max/Min) at 50/30°C
kW
21.6/4.2
25.9/4.2
31.3/5.4
36.7/4.2
Full load efficiency at Max/Min output, at 80/60°C
%
98.3/97.4
98.1/97.4
98.4/97.6
98.0/97.6
Full load efficiency at Max/Min output, at 50/30°C
(condensation)
%
107.9/106.9
107.2/106.9
108.6/106.9
107.7/106.9
Partial load (30%) efficiency, with 47°C return temperature
%
100.7
101.6
101.8
101.9
Partial load (30%) efficiency, with 30°C return temperature
%
108.6
108.4
108.4
108.3
Heat Loss through the case with burner switched on
%
0.1
0.1
0.1
0.1
Heat Loss through the chimney with burner switched on
%
1.6
1.8
1.5
1.9
Seasonal efficiency rate (SEDBUK rating)
-
A
NOx class
-
5
Category
-
II2H3P
Type
-
Heating and instantaneous hot water production
Heating output adjustment
-
Adjustable over entire Max/Min output range
Type of heating installation
-
Close circuit
Maximum heating pressure
bar
2.5
Maximum heating temperature
°C
90
Adjustable heating temperature range
°C
40-90
Expansion vessel volume
l
6.0
Expansion vessel pre-load
bar
1
Minimum DHW pressure
bar
1.0
1.2
1.4
1.4
Minimum DHW flow
l/min
2.0
Maximum DHW pressure
bar
10
Adjustable DHW temperature range
°C
30–65
Specific flow (ΔT=25°C)
l/min
13.8
16.1
19.5
22.9
Specific flow (ΔT=30°C)
l/min
11.5
13.4
16.2
19.1
Specific flow for kitchen (ΔT=45°C)
l/min
7.6
8.9
10.8
12.7
Electrical supply
-
230 V/ 50 Hz
Nominal current
A
0.6
0.62
Electrical maximum consumption
W
130
Electrical protection
-
IP X5D
Boiler mounting system type
-
Wall-mounted
