3
2.1 PERFORMANCE - NATURAL GAS (CAT: I2H 2H - G20 - 20 mbar)
2 TECHNICAL DATA
Alpha CD25X/28X - Technical Data
Alpha CD25X
MAX.
20.4
69 600
18.4
62 780
19.5
66 530
18.0
61 420
3.32
1.33
1.95
68.8
MIN.
5.2
17 740
4.7
16 040
4.8
16 400
4.5
15 350
0.4
0.16
0.6
21.2
Room sealed
chamber panel
fitted
Central Heating
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Heat Output (H
s
condensing) kW
(50°C/30°C) Btu/h
Heat Output (H
i
non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Gas Rate m³/h
ft³/h
9.6
2.2
11.2
2.5
MAX.
26.6
90 760
24.0
81 900
24.0
81 900
5.20
2.08
2.54
89.7
MIN.
5.2
17 740
4.7
16 040
4.5
15 350
0.4
0.16
0.6
21.2
Domestic Hot Water
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Output to Water (H
s
)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg
Gas Rate m³/h
ft³/h
Flow Rate at 35°C Rise L/min
gal/min
Specific Flow Rate (D) at 30°C Rise L/min
(Flow rate @ 30K to EN625) gal/min
Room sealed
chamber panel
fitted
Alpha CD25X
MAX.
27.3
93 150
24.6
83 930
25.8
88 030
24.0
81 900
6.6
2.64
2.61
92.1
MIN.
5.5
18 760
5.0
17 060
5.1
17 400
4.9
16 720
0.24
0.10
0.53
18.7
Room sealed
chamber panel
fitted
Central Heating
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Heat Output (H
s
condensing) kW
(50°C/30°C) Btu/h
Heat Output (H
i
non-condensing) kW
(80°C/60°C) Btu/h
Differential Burner mbar
Pressure in wg
Gas Rate m³/h
ft³/h
Alpha CD28X
11.4
2.5
13.3
2.9
Domestic Hot Water
Heat Input (H
s
)kW
(Gross) Btu/h
Heat Input (H
i
)kW
(Net) Btu/h
Output to Water (H
s
)kW
(modulating) Btu/h
Differential Burner mbar
Pressure in wg
Gas Rate m³/h
ft³/h
Flow Rate at 35°C Rise L/min
gal/min
Specific Flow Rate (D) at 30°C Rise L/min
(Flow rate @ 30K to EN625) gal/min
Room sealed
chamber panel
fitted
Alpha CD28X
MIN.
5.5
18 760
5.0
17 060
4.9
16 720
0.24
0.10
0.53
18.7
MAX.
31.8
108 500
28.7
97 900
28.7
97 900
8.83
3.53
3.03
106.9
Note: The above appliances are fully modulating and are not range rated.
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