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Overview of benefits

Gas condensing boilers, sealed combustion chamber, for room sealed or open flue operation

High standard seasonal efficiency [to DIN] up to 110% (net cv) / 99% (gross cv) for the best possible energy efficiency

Cascadable up to 120 kW

Suitable for hybrid systems with WOLF heat pumps

Efficient combustion technology with gas-adaptive, self-calibrating combustion controller that adjusts automatically to the gas quality

Premix burner for natural gas E, LL and LPG, variable modulating heating output from 1.8 kW

With expansion vessel, modulating high efficiency pump (EEI ≤ 0.20) and 3-way valve as standard

The appliance converts automatically to different gas types without a conversion kit or needing to reconfigure the control unit

Automatic CO2 settings with self-calibrating combustion air controller for extremely clean combustion

Optimum utilisation of condensing technology by controlling the spread without an overflow valve; no return temperature raising required

Heating water heat exchanger can be pivoted under system pressure for maintenance without having to drain the heating water

WOLF “ALUPro” coated heating water heat exchanger

Smart-home-capable with the integrated WOLF Link home

WOLF WRS-2 control system can be set and adjusted via smartphone or PC

Convenient access to all components for quick installation and easy operation and maintenance

Specifications

CGB-2(K)
Model type
CGB-2-14
CGB-2-20
CGB-2-24
CGB-2 K-20
CGB-2 K-24
Energy efficiency class
Central heating energy efficiency class
A
A
A
A
A
Energy efficiency class, DHW heating
-
-
-
A
A
General data
Rated heating output at 80/60°C
kW
13.5
18.9/22.2
23.8/27.1
18.9/22.2
23.8/27.1
Rated heating output at 50/30°C
kW
15.2
20.4
25.8
20.4
25.8
Rated heat input
kW
14
19.6/23.0
24.6/28.0
19.6/23.0
24.6/28.0
Lowest heating output (modulating)
At 80/60°C
kW
1.8/4.6
3.8/6.8
4.8/6.8
3.8/6.8
4.8/6.8
At 50/30°C
kW
2.1/5.4
4.4/7.4
5.6/7.4
4.4/7.4
5.6/7.4
Lowest heat input (modulating)
kW
1.9/4.9
3.9/6.9
4.9/6.9
3.9/6.9
4.9/6.9
Heating flow connection
Thread
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
Heating return connection
Thread
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
Cold water connection / DHW circulation
Thread
¾“
¾“
¾“
¾“
¾“
Cold water connection
Thread
¾“
¾“
¾“
¾“
¾“
Gas connection
R
½“
½“
½“
½“
½“
Balanced flue connection
mm
60/100
60/100
60/100
60/100
60/100
Dimensions
Depth
mm
378
378
378
378
378
Width
mm
440
440
440
440
440
Height
mm
790
790
790
790
790
Total weight
kg
33
33
33
33
33
Balanced flue
Type
B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
Gas category
II2N3P
II2N3P
II2N3P
II2N3P
II2N3P
Gas connection value
Natural gas E/H (net cv = 9.5 kWh/m³ = 34.2 MJ/m³)
m³/h
1.44
2.06/2.42
2.52/2.95
2.06/2.42
2.52/2.95
Natural gas LL (net cv = 8.6 kWh/m³ = 31.0 MJ/m³)
m³/h
1.59
2.28/2.67
2.79/3.25
2.28/2.67
2.79/3.25
LPG P (net cv = 12.8 kWh/m³ = 46.1 MJ/m³)
kg/h
1.07
1.53/1.80
1.87/2.19
1.53/1.80
1.87/2.19
Gas supply pressure
Natural gas (permissible min./max.)
mbar
20(17-25)
20(17-25)
20(17-25)
20(17-25)
20(17-25)
LPG (permissible min./max.)
mbar
50(42.5-57.5)
50(42.5-57.5)
50(42.5-57.5)
50(42.5-57.5)
50(42.5-57.5)
Standard seasonal efficiency [to DIN] at 40/30°C (net cv/gross cv)
%
110/99
110/99
110/99
110/99
110/99
Standard seasonal efficiency at 75/60°C (net cv/gross cv)
%
107/96
107/96
107/96
107/96
107/96
Efficiency
At rated load at 80/60°C (net cv/gross cv)
%
98/88
98/88
98/88
98/88
98/88
At 30% partial load and TR = 30°C (net cv/gross cv)
%
108/97
108/97
108/97
108/97
108/97
Flow temperature, factory setting
°C
75
75
75
75
75
Flow temperature up to approx.
°C
90
90
90
90
90
Max. total pressure
bar
3
3
3
3
3
High-efficiency pump (EEI < 0.23)
600 l/h pump rate (14 kW at Δt = 20 K)
mbar
550
550
550
550
550
860 l/h pump rate (20 kW at Δt = 20 K)
mbar
-
430
430
430
430
1030 l/h pump rate (24 kW at Δt = 20 K)
mbar
-
-
280
-
280
DHW flow rate
l/min
-
-
-
2.0-6.5
2.0-8.0
Minimum flow pressure to EN 625
bar
-
-
-
0.4
0.65
Spec. water throughput “D” at ΔT = 30 K
l/min
-
-
-
10.3
13
Max. permissible total pressure, DHW
bar
-
-
-
10
10
DHW temperature range (adjustable)
°C
-
-
-
45-65
45-65
DHW capacity of heating water heat exchanger
litres
1.3
1.3
1.3
1.3
1.3
Expansion vessel, total capacity
Litre
10
10
10
10
10
Expansion vessel, pre-charge pressure
bar
0.75-0.95
0.75-0.95
0.75-0.95
0.75-0.95
0.75-0.95
Flue gas temperature 80/60-50/30 at Qmax
°C
62-45
70-50
76-50
70-50
76-50
Flue gas temperature 80/60-50/30 at Qmin
°C
30-25
30-25
33-27
30-25
33-27
Available gas fan draught
at Qmax
Pa
125
135
180
135
180
at Qmin
Pa
10
14
17
17
14
Flue gas category
G52
G52
G52
G52
G52
NOx class
5
5
5
5
5
Amount of condensate at 50/30°C
l/h
approx. 1.4
approx. 2.0
approx. 2.4
approx. 2.0
approx. 2.4
Condensate pH value
approx. 4.0
approx. 4.0
approx. 4.0
approx. 4.0
approx. 4.0
Power consumption on standby
W
3
3
3
3
3
Maximum power consumption
W
17-45/59
17-51/63
17-62/88
17-51/63
17-62/88
IP rating
IP
IP X4D
IP X4D
IP X4D
IP X4D
IP X4D
Electrical connection/fuse protection
230 V / 50 Hz / 16 A/B
230 V / 50 Hz / 16 A/B
230 V / 50 Hz / 16 A/B
230 V / 50 Hz / 16 A/B
230 V / 50 Hz / 16 A/B

Specifications

CGB-2(K)
  • CGB-2-14

  • CGB-2-20

  • CGB-2-24

  • CGB-2 K-20

  • CGB-2 K-24

    Energy efficiency class
    Central heating energy efficiency class
    A
    A
    A
    A
    A
    Energy efficiency class, DHW heating
    -
    -
    -
    A
    A
    General data
    Rated heating output at 80/60°C (kW)
    13.5
    18.9/22.2
    23.8/27.1
    18.9/22.2
    23.8/27.1
    Rated heating output at 50/30°C (kW)
    15.2
    20.4
    25.8
    20.4
    25.8
    Rated heat input (kW)
    14
    19.6/23.0
    24.6/28.0
    19.6/23.0
    24.6/28.0
    Lowest heating output (modulating)
    At 80/60°C (kW)
    1.8/4.6
    3.8/6.8
    4.8/6.8
    3.8/6.8
    4.8/6.8
    At 50/30°C (kW)
    2.1/5.4
    4.4/7.4
    5.6/7.4
    4.4/7.4
    5.6/7.4
    Lowest heat input (modulating) (kW)
    1.9/4.9
    3.9/6.9
    4.9/6.9
    3.9/6.9
    4.9/6.9
    Heating flow connection (Thread)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    Heating return connection (Thread)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    Cold water connection / DHW circulation (Thread)
    ¾“
    ¾“
    ¾“
    ¾“
    ¾“
    Cold water connection (Thread)
    ¾“
    ¾“
    ¾“
    ¾“
    ¾“
    Gas connection (R)
    ½“
    ½“
    ½“
    ½“
    ½“
    Balanced flue connection (mm)
    60/100
    60/100
    60/100
    60/100
    60/100
    Dimensions
    Depth (mm)
    378
    378
    378
    378
    378
    Width (mm)
    440
    440
    440
    440
    440
    Height (mm)
    790
    790
    790
    790
    790
    Total weight (kg)
    33
    33
    33
    33
    33
    Balanced flue (Type)
    B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
    B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
    B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
    B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
    B23P, B33P, C13(x), C33(x), C43(x), C53(x), C63(x), C83(x), C93(x)
    Gas category
    II2N3P
    II2N3P
    II2N3P
    II2N3P
    II2N3P
    Gas connection value
    Natural gas E/H (net cv = 9.5 kWh/m³ = 34.2 MJ/m³) (m³/h)
    1.44
    2.06/2.42
    2.52/2.95
    2.06/2.42
    2.52/2.95
    Natural gas LL (net cv = 8.6 kWh/m³ = 31.0 MJ/m³) (m³/h)
    1.59
    2.28/2.67
    2.79/3.25
    2.28/2.67
    2.79/3.25
    LPG P (net cv = 12.8 kWh/m³ = 46.1 MJ/m³) (kg/h)
    1.07
    1.53/1.80
    1.87/2.19
    1.53/1.80
    1.87/2.19
    Gas supply pressure
    Natural gas (permissible min./max.) (mbar)
    20(17-25)
    20(17-25)
    20(17-25)
    20(17-25)
    20(17-25)
    LPG (permissible min./max.) (mbar)
    50(42.5-57.5)
    50(42.5-57.5)
    50(42.5-57.5)
    50(42.5-57.5)
    50(42.5-57.5)
    Standard seasonal efficiency [to DIN] at 40/30°C (net cv/gross cv) (%)
    110/99
    110/99
    110/99
    110/99
    110/99
    Standard seasonal efficiency at 75/60°C (net cv/gross cv) (%)
    107/96
    107/96
    107/96
    107/96
    107/96
    Efficiency
    At rated load at 80/60°C (net cv/gross cv) (%)
    98/88
    98/88
    98/88
    98/88
    98/88
    At 30% partial load and TR = 30°C (net cv/gross cv) (%)
    108/97
    108/97
    108/97
    108/97
    108/97
    Flow temperature, factory setting (°C)
    75
    75
    75
    75
    75
    Flow temperature up to approx. (°C)
    90
    90
    90
    90
    90
    Max. total pressure (bar)
    3
    3
    3
    3
    3
    High-efficiency pump (EEI < 0.23)
    600 l/h pump rate (14 kW at Δt = 20 K) (mbar)
    550
    550
    550
    550
    550
    860 l/h pump rate (20 kW at Δt = 20 K) (mbar)
    -
    430
    430
    430
    430
    1030 l/h pump rate (24 kW at Δt = 20 K) (mbar)
    -
    -
    280
    -
    280
    DHW flow rate (l/min)
    -
    -
    -
    2.0-6.5
    2.0-8.0
    Minimum flow pressure to EN 625 (bar)
    -
    -
    -
    0.4
    0.65
    Spec. water throughput “D” at ΔT = 30 K (l/min)
    -
    -
    -
    10.3
    13
    Max. permissible total pressure, DHW (bar)
    -
    -
    -
    10
    10
    DHW temperature range (adjustable) (°C)
    -
    -
    -
    45-65
    45-65
    DHW capacity of heating water heat exchanger (litres)
    1.3
    1.3
    1.3
    1.3
    1.3
    Expansion vessel, total capacity (Litre)
    10
    10
    10
    10
    10
    Expansion vessel, pre-charge pressure (bar)
    0.75-0.95
    0.75-0.95
    0.75-0.95
    0.75-0.95
    0.75-0.95
    Flue gas temperature 80/60-50/30 at Qmax (°C)
    62-45
    70-50
    76-50
    70-50
    76-50
    Flue gas temperature 80/60-50/30 at Qmin (°C)
    30-25
    30-25
    33-27
    30-25
    33-27
    Available gas fan draught
    at Qmax (Pa)
    125
    135
    180
    135
    180
    at Qmin (Pa)
    10
    14
    17
    17
    14
    Flue gas category
    G52
    G52
    G52
    G52
    G52
    NOx class
    5
    5
    5
    5
    5
    Amount of condensate at 50/30°C (l/h)
    approx. 1.4
    approx. 2.0
    approx. 2.4
    approx. 2.0
    approx. 2.4
    Condensate pH value
    approx. 4.0
    approx. 4.0
    approx. 4.0
    approx. 4.0
    approx. 4.0
    Power consumption on standby (W)
    3
    3
    3
    3
    3
    Maximum power consumption (W)
    17-45/59
    17-51/63
    17-62/88
    17-51/63
    17-62/88
    IP rating (IP)
    IP X4D
    IP X4D
    IP X4D
    IP X4D
    IP X4D
    Electrical connection/fuse protection
    230 V / 50 Hz / 16 A/B
    230 V / 50 Hz / 16 A/B
    230 V / 50 Hz / 16 A/B
    230 V / 50 Hz / 16 A/B
    230 V / 50 Hz / 16 A/B

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