7
2.1 Central Heating
Excel 25
Excel 29
Heat input (kW)
20.00
25.00
Maximum heat output (kW) 60/80°C
19.50
24.45
Minimum heat output (kW) 60/80°C
4.91
5.90
Maximum heat output (kW) 30/50°C
20.84
26.23
Minimum heat output (kW) 30/50°C
5.36
6.40
Minimum working pressure
0.25-0.45 bar
Maximum working pressure
2.5 bar
Minimum flow rate
350 l/h
2.2 Domestic Hot Water
Excel 25
Excel 29
Heat input (kW)
25.00
29.00
Flow Rate: ΔT35°C
10.20 l/min
12.0 l/min
Maximum inlet pressure
6 bar
Minimum inlet pressure
0.15 bar
Minimum flow rate
2 l/min
2.3 Gas Pressures
Excel 25
Excel 29
Inlet pressure (G20)
20.0 mbar
20.0 mbar
Heating maximum gas rate (m3/hr)
2.12
2.64
DHW maximum gas rate (m3/hr)
2.64
3.07
Minimum gas rate (m3/hr)
0.53
0.63
Injector size (mm)
5.1
5.6
Silencer flange (ø mm) (fitted)
31
-
2.4 Expansion Vessel
Excel 25
Excel 29
Capacity
8 litres
Maximum system volume
74 litres
Pre-charge pressure
1 bar
2.5 Dimensions
Excel 25
Excel 29
Height (mm)
715
Width (mm)
405
Depth (mm)
250
Dry weight (kg)
28
29
2.6 Clearances
Excel 25
Excel 29
Sides
12mm
Top
150mm from casing or 25mm above flue elbow (whichever is applicable)
Bottom
150mm
Front
600mm
2.7 Connections
Excel 25
Excel 29
Flow & return
22mm
Gas
15mm
DHW hot & cold
15mm
Safety valve
15mm
Condense
21mm
2.8 Electrical
Excel 25
Excel 29
Power consumption (Watts)
110
119
Voltage (V/Hz)
230/50
Internal fuse
3.15A T (for PCB) - 3.15A F (for connections block)
External fuse
3A
2.9 Flue Details (concentric 60-100)
Excel 25
Excel 29
Maximum horizontal flue length (60/100mm)
5.85m
4.85m
Maximum vertical flue length (60/100mm)
6.85m
5.85m
2.9A Flue Details (concentric 80-125)
Excel 25
Excel 29
Maximum horizontal flue length (80/125mm)
15.3m
12.8m
Maximum vertical flue length (80/125mm)
20.3m
17.8m
2.9B Flue Details (twin pipes)
Excel 25
Excel 29
Maximum horizontal flue length (80mm/80mm)
45m/45m
40m/40m
Maximum vertical flue length (80mm/80mm)
45m/45m
40m/40m
SECTION 2 - TECHNICAL DATA