8 About the Boiler
2.3 Technical Data
The following table lists the general specifications for the boiler.
Specifications
Unit
NCB500-1.5S/37K
NCB500-2S/41K
Heat input range
kW
26.8/4.6
26.8/4.6
DHW heat input range
kW
37.0/4.6
41.0/4.6
Heat output range @ 80/60°C
kW
26.0/4.5
26.0/4.5
DHW output range
kW
37.0/4.6
37.0/4.6
Condensing heat output range @ 50/30°C
kW
28.2/4.8
28.2/4.8
Full load efficiency at Max. output @ 80/60°C
%
88.4
88.4
Full load efficiency at Max./Min. output @ 50/30°C (Condensing)
%
106.5
106.5
Partial load (30%) efficiency with 30°C return temp.
%
108.1
108.1
Heat loss through the case with burner switched on
%
0.1
Seasonal efficiency rate (SEDBUK 2009)
-
NOx Classification
-
Class 6
Category
-
II2H3P
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
6
Expansion vessel pre-charged pressure
bar
1.0
Min. DHW working pressure
bar
0.7
1.1
Min. DHW working flow
l/min
2
Max. DHW working pressure
bar
10
Adjustable DHW temperature range
°C
30-65
DHW flow rate @ 25°C temp. rise.
l/min
21
24
DHW flow rate @ 30°C temp. rise.
l/min
18
20
DHW flow rate for kitchen @ 45°C temp. rise.
l/min
12
13
Electrical power supply
-
230V/50Hz
Nominal current
A
0.6
0.6
Max. power consumption
W
70
75
Appliance protection rating
-
IPX5D
Boiler mounting system type
-
Wall-mounted
Flue exhaust/Air intake system types
-
B23-B33-B53-C13-C33-C43-C53-C63-C83
Flue exhaust/Air intake system diameters
mm
Coaxial Ø60/100 and Ø80/125–Dual duct Ø80/80
