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Conventional gas boiler

CGU-2K

Comfortline conventional gas boiler / combi boiler

Conventional, open flue, gas combi boiler for low temperature heating and DHW heating with integral DHW heat exchanger and electronic flue gas monitoring; tested in accordance with EC directives for connection to a chimney.

CGU-210
CGU-2K18
CGU-2K24

This boiler with natural ventilation is intended exclusively for connection in existing buildings to a flue gas system that is shared by multiple apartments
and that routes the combustion residues from the installation room to the outside.
Note: B1-type units are exempt from the ErP directive efficiency requirements if connected to multiple apartments.
They draw the combustion air directly from the installation room and are equipped with a draught hood.
This boiler should not be used for any other purpose due to its reduced efficiency as it would lead to higher energy consumption
and higher operating costs.

What do you want to know?

Overview of benefits

Conventional wall mounted gas combi boiler for open flue operation

Tested according to the applicable EC directives

Electronic ignition and monitoring

Water-cooled, atmospheric premix burner for natural gas E, LL and LPG

WOLF low NOx unit with Hydro Tec system designed for lowest emissions (NOx category 5)

Modulating controlled output in heating and DHW modes

Equipped as standard with variable high efficiency pump, 3-way changeover valve, 10-l expansion vessel

Easy installation and operation

Electronic output matching, no adjustment necessary at the gas combination valve

High standard seasonal efficiency [to DIN] up to 94% (net cv) / 85% (gross cv) for the best possible energy efficiency

Specifications

Model type
CGU-2-10
CGU-2K-18
CGU-2K-24
Energy efficiency class
Central heating energy efficiency class
C
C
C
Energy efficiency class, DHW heating
-
A
A
Output range
kW
7.5-10
8-18
10.9-24
Input range
kW
8.3-11.2
8.8-20.2
12.0-26.5
Heating flow line outside diameter
Thread
¾“
¾“
¾“
Heating return line outside diameter
Thread
¾“
¾“
¾“
DHW connection or cylinder flow
Thread
¾“
¾“
¾“
Cold water connection or cylinder return
Thread
¾“
¾“
¾“
Outdoor gas connection
Thread
1/2“
1/2“
1/2“
Dimensions
Flue connection
mm
110
110
130
Balanced flue connection
mm
-
-
-
Balanced flue
Type
B11BS
B11BS
B11BS
Gas category
II2ELL3P
II2ELL3P
II2ELL3P
Gas supply details for natural gas E/H (net cv = 9.5 kWh/m³ = 34.0 MJ/m³)
m³/h
1.3
2.1
2.8
Natural gas LL (net cv = 8.1 kWh/m³ = 31.0 MJ/m³)
m³/h
1.5
2.3
3.1
LPG P (net cv = 12.9 kWh/kg = 46.3 MJ/kg)
kg/h
0.8
1.5
2.1
Gas supply pressure, natural gas
mbar
20
20
20
Gas supply pressure, LPG P
mbar
50
50
50
Standard seasonal efficiency [to DIN] at 75/60°C (net cv/gross cv)
%
93 / 85
94 / 85
Residual head for heating circuit: High-efficiency pump (EEI < 0.23) 430 l/h pump rate (10 kW at Δt = 20 K)
mbar
250
250
-
770 l/h pump rate (18 kW at Δt = 20K)
mbar
-
250
250
1030 l/h pump rate (24 kW at Δt = 20 K)
mbar
-
-
250
DHW flow rate
l/min
-
2.7-6
2.7-8
Max. operating pressure
bar
3
3
Max. DHW temperature 1)
°C
- / 15 - 65
40 - 65 / 15 - 65
40 - 65 / 15 - 65
Expansion vessel, nominal capacity
litres
10
10
10
Expansion vessel, pre-charge pressure
bar
0.75
0.75
0.75
Required draught for the heat generator
Pa
1.5
1.5
1.5
Flue gas temperature 2)
°C
84 / 101
80 / 123
80 / 125
Flue gas mass flow rate 2)
g/s
12.8 - 13.1
12.8 / 13.9
15.0 / 19.0
NOx class
6
6
6
Power consumption (standby / max.)
W
58 / 5
58 / 5
58 / 5
IP rating
IP
IP X4D
IP X4D
IP X4D
Total weight
kg
38
38
40
Electrical connection
230V / 50Hz

Specifications

  • CGU-2-10

  • CGU-2K-18

  • CGU-2K-24

    Energy efficiency class
    Central heating energy efficiency class
    C
    C
    C
    Energy efficiency class, DHW heating
    -
    A
    A
    Output range (kW)
    7.5-10
    8-18
    10.9-24
    Input range (kW)
    8.3-11.2
    8.8-20.2
    12.0-26.5
    Heating flow line outside diameter (Thread)
    ¾“
    ¾“
    ¾“
    Heating return line outside diameter (Thread)
    ¾“
    ¾“
    ¾“
    DHW connection or cylinder flow (Thread)
    ¾“
    ¾“
    ¾“
    Cold water connection or cylinder return (Thread)
    ¾“
    ¾“
    ¾“
    Outdoor gas connection (Thread)
    1/2“
    1/2“
    1/2“
    Dimensions
    Flue connection (mm)
    110
    110
    130
    Balanced flue connection (mm)
    -
    -
    -
    Balanced flue (Type)
    B11BS
    B11BS
    B11BS
    Gas category
    II2ELL3P
    II2ELL3P
    II2ELL3P
    Gas supply details for natural gas E/H (net cv = 9.5 kWh/m³ = 34.0 MJ/m³) (m³/h)
    1.3
    2.1
    2.8
    Natural gas LL (net cv = 8.1 kWh/m³ = 31.0 MJ/m³) (m³/h)
    1.5
    2.3
    3.1
    LPG P (net cv = 12.9 kWh/kg = 46.3 MJ/kg) (kg/h)
    0.8
    1.5
    2.1
    Gas supply pressure, natural gas (mbar)
    20
    20
    20
    Gas supply pressure, LPG P (mbar)
    50
    50
    50
    Standard seasonal efficiency [to DIN] at 75/60°C (net cv/gross cv) (%)
    93 / 85
    94 / 85
    Residual head for heating circuit: High-efficiency pump (EEI < 0.23) 430 l/h pump rate (10 kW at Δt = 20 K) (mbar)
    250
    250
    -
    770 l/h pump rate (18 kW at Δt = 20K) (mbar)
    -
    250
    250
    1030 l/h pump rate (24 kW at Δt = 20 K) (mbar)
    -
    -
    250
    DHW flow rate (l/min)
    -
    2.7-6
    2.7-8
    Max. operating pressure (bar)
    3
    3
    Max. DHW temperature 1) (°C)
    - / 15 - 65
    40 - 65 / 15 - 65
    40 - 65 / 15 - 65
    Expansion vessel, nominal capacity (litres)
    10
    10
    10
    Expansion vessel, pre-charge pressure (bar)
    0.75
    0.75
    0.75
    Required draught for the heat generator (Pa)
    1.5
    1.5
    1.5
    Flue gas temperature 2) (°C)
    84 / 101
    80 / 123
    80 / 125
    Flue gas mass flow rate 2) (g/s)
    12.8 - 13.1
    12.8 / 13.9
    15.0 / 19.0
    NOx class
    6
    6
    6
    Power consumption (standby / max.) (W)
    58 / 5
    58 / 5
    58 / 5
    IP rating (IP)
    IP X4D
    IP X4D
    IP X4D
    Total weight (kg)
    38
    38
    40
    Electrical connection
    230V / 50Hz
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