Technical Data - Navien NCB-20LHWE Installation & Operation Manual

2.3 Technical Data

The following table lists the general speci cations for the boiler.
Heat input range
Heat output range @ 80/60°C
Condensing heat output range @ 50/30°C
Full load e ciency at Max./Min. output @ 80/60°C
Full load e ciency at Max./Min. output @ 50/30°C
Partial load (30%) e ciency with 47°C return temp.
Partial load (30%) e ciency with 30°C return temp.
Heat loss through the case with burner switched on
Heat loss through the chimney with burner switched on
Seasonal e ciency rate (SEDBUK 2009)
NOx Classi cation
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
Electrical power supply
Nominal current
Max. power consumption
Appliance protection rating
Boiler mounting system type
Flue exhaust/Air intake system types
Flue exhaust/Air intake system diameters
Max. gas pipe pressure drop
Max. horizontal coaxial length Ø60/100
Max. vertical coaxial length Ø60/100
Equivalent elbow length @ 90° Ø60/100
Equivalent elbow length @ 45° Ø60/100
Max. horizontal coaxial length Ø80/125
8 About the Boiler
Speci cations
(Condensing)
Category
Type
NCB- NCB-
Unit
20LHWE 23LHWE
kW 20.0/4.2 24.0/4.2
kW 19.5/3.9 23.4/3.9
kW 21.4/4.5 25.6/4.5
% 97.5/96.4 97.5/96.4
% 106.9/107.8 106.6/107.8
% 101.9 103.1
% 108.6 108.9
% 0.1
% 1.6
- 89.0 89.1
-
-
- Heating and instantaneous hot water production
- Adjustable over entire Max./Min. output range
-
bar
°C
°C
l
bar
-
A 0.6
W
-
-
- B23-B33-B53-C13-C33-C43-C53-C63-C83
mm Coaxial Ø60/100 and Ø80/125–Dual duct Ø80/80
Pa 167 167
m
m
m
m
m
NCB-
28LHWE
29.0/5.1
28.3/4.9
31.1/5.4
97.6/96.4
107.3/106.9 106.9/106.9
102.0
108.5
0.1 0.1
1.8 1.5
89.0
Class 5
II2H3P
Close circuit
2.5
90
40-90
6.0
1.0
230 V/50 Hz
0.6 0.62
130
IP X5D
Wall-mounted
294
20
21
1.3
1.0
68
NCB-
33LHWE
34.0/4.0
33.2/3.8
36.3/4.3
97.6/95.8
103.1
108.8
0.1
1.9
89.1
0.62
294