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