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Gas condensing solar centre

CSZ-2

ComfortLine gas condensing solar centre with solar cylinder, solar pump assembly and control unit

CSZ-214/300R
CSZ-220/300R
CSZ-224/300R

The WOLF CSZ-2 series is the ideal compact solution – gas condensing technology combined with solar DHW heating – with a solar coverage rate of up to 60% for buildings of up to 150 m² available floor area. In accordance with the obligation under the Renewable Energies Heat Act (EEWärmeG) to use renewables, 15% of the heat demand must be provided by solar energy. A collector surface area of at least 0.04 m² per m² floor area must be calculated for residential buildings with a maximum of two units.

What do you want to know?

Overview of benefits

Gas condensing boiler, solar cylinder, solar pump assembly with SM1-2 solar module and 25-l expansion vessel; 10-l drip pan for solar fluid, standard control unit for gas condensing boiler with BM-2 programming unit including outside temperature sensor

Compact design - the gas condensing solar centre fits in almost any recess

Solar boiler shutdown for excessively sunny conditions

No side clearance required for service purposes as all components are accessible from the front; minimal clearance required on the connection side

Connections for central heating and solar circuit either on the left or right; connections for DHW, cold water and DHW circulation at the top

Solar cylinder with highly effective thermal insulation including insulated base

Specifications

Model type
CSZ-2 14/300R
CSZ-2 20/300R
CSZ-2 24/300R
Energy efficiency class
Central heating energy efficiency class
A
A
A
Energy efficiency class, DHW heating
A
A
A
General data
Rated heating output at 80/60°C
kW
13.5
18.9/22.2
23.8/27.1
Rated heating output at 50/30°C
kW
15.2
20.4
25.8
Rated heat input
kW
14
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
At 50/30°C
kW
2.1/5.4
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
Heating flow connection
Thread
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
Heating return connection
Thread
¾“ (DN 20)
¾“ (DN 20)
¾“ (DN 20)
Cold water connection / DHW circulation
Thread
¾“
¾“
¾“
Cold water connection
Thread
¾“
¾“
¾“
Gas connection
R
½“
½“
½“
Balanced flue connection
mm
60/100
60/100
60/100
Dimensions
Depth
mm
635
635
635
Width
mm
600
600
600
Height
mm
1792
1792
1792
Total weight
kg
115 (35+80)
115 (35+80)
115 (35+80)
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)
Gas category
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
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
LPG P (net cv = 12.8 kWh/m³ = 46.1 MJ/m³)
kg/h
1.07
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)
LPG (permissible min./max.)
mbar
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
Standard seasonal efficiency at 75/60°C (net cv/gross cv)
%
107/96
107/96
107/96
Efficiency
At rated load at 80/60°C (net cv/gross cv)
%
98/88
98/88
98/88
At 30% partial load and TR = 30°C (net cv/gross cv)
%
108/97
108/97
108/97
Flow temperature, factory setting
°C
75
75
75
Flow temperature up to approx.
°C
90
90
90
Max. total pressure
bar
3
3
3
Residual head for heating circuit: High efficiency pump (EEI < 0.23)
600 l/h pump rate (14 kW at Δt = 20 K)
mbar
550
550
550
860 l/h pump rate (20 kW at Δt = 20 K)
mbar
-
430
430
1030 l/h pump rate (24 kW at Δt = 20 K)
mbar
-
-
280
Max. permissible total pressure, DHW
bar
10
10
10
DHW temperature range (adjustable)
°C
15-65
15-65
15-65
DHW capacity of heating water heat exchanger
litres
1.3
1.3
1.3
Nominal capacity of the cylinder with internal indirect coil / equivalent nominal capacity
litres
145
145
145
Spec. water throughput “D” at ΔT = 30 K
l/min
19.7
21.4
21.7
Continuous DHW output to DIN 4708
l/h (kW)
324 (13.6)
555 (22.6)
612 (25)
Performance factor to DIN 4708
NL
1.7
2
2.2
DHW output
l/10 min
162
176
182
Standby heat loss to EN 12897
kWh/24 h
1.47
1.47
1.47
Corrosion protection, DHW heat exchanger / cylinder
Stainless steel / two-layer enamel coating to DIN 4753
Stainless steel / two-layer enamel coating to DIN 4753
Stainless steel / two-layer enamel coating to DIN 4753
Expansion vessel, total capacity
Litre
10
10
10
Expansion vessel, pre-charge pressure
bar
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
Flue gas temperature 80/60-50/30 at Qmin
°C
30-25
30-25
33-27
Flue gas mass flow
at Qmax
g/s
6.2
8.8/10.7
10.9/13.0
at Qmin
g/s
0.9
1.8
2.3
Available gas fan draught
at Qmax
Pa
90
90
90
at Qmin
Pa
12
12
12
Flue gas category
G52
G52
G52
NOx class
5
5
5
Amount of condensate at 50/30°C
l/h
approx. 1.4
approx. 2.0
approx. 2.4
Condensate pH value
approx. 4.0
approx. 4.0
approx. 4.0
Power consumption on standby
W
3
3
3
Maximum power consumption
W
17-59/45
17-51/63
17-62/88
IP rating
IP
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
Weights
Total weight
kg
160 (35 + 125)
160 (35 + 125)
160 (35 + 125)
Installation weight (filled with water)
kg
583
583
583

Specifications

  • CSZ-2 14/300R

  • CSZ-2 20/300R

  • CSZ-2 24/300R

    Energy efficiency class
    Central heating energy efficiency class
    A
    A
    A
    Energy efficiency class, DHW heating
    A
    A
    A
    General data
    Rated heating output at 80/60°C (kW)
    13.5
    18.9/22.2
    23.8/27.1
    Rated heating output at 50/30°C (kW)
    15.2
    20.4
    25.8
    Rated heat input (kW)
    14
    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
    At 50/30°C (kW)
    2.1/5.4
    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
    Heating flow connection (Thread)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    Heating return connection (Thread)
    ¾“ (DN 20)
    ¾“ (DN 20)
    ¾“ (DN 20)
    Cold water connection / DHW circulation (Thread)
    ¾“
    ¾“
    ¾“
    Cold water connection (Thread)
    ¾“
    ¾“
    ¾“
    Gas connection (R)
    ½“
    ½“
    ½“
    Balanced flue connection (mm)
    60/100
    60/100
    60/100
    Dimensions
    Depth (mm)
    635
    635
    635
    Width (mm)
    600
    600
    600
    Height (mm)
    1792
    1792
    1792
    Total weight (kg)
    115 (35+80)
    115 (35+80)
    115 (35+80)
    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)
    Gas category
    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
    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
    LPG P (net cv = 12.8 kWh/m³ = 46.1 MJ/m³) (kg/h)
    1.07
    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)
    LPG (permissible min./max.) (mbar)
    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
    Standard seasonal efficiency at 75/60°C (net cv/gross cv) (%)
    107/96
    107/96
    107/96
    Efficiency
    At rated load at 80/60°C (net cv/gross cv) (%)
    98/88
    98/88
    98/88
    At 30% partial load and TR = 30°C (net cv/gross cv) (%)
    108/97
    108/97
    108/97
    Flow temperature, factory setting (°C)
    75
    75
    75
    Flow temperature up to approx. (°C)
    90
    90
    90
    Max. total pressure (bar)
    3
    3
    3
    Residual head for heating circuit: High efficiency pump (EEI < 0.23)
    600 l/h pump rate (14 kW at Δt = 20 K) (mbar)
    550
    550
    550
    860 l/h pump rate (20 kW at Δt = 20 K) (mbar)
    -
    430
    430
    1030 l/h pump rate (24 kW at Δt = 20 K) (mbar)
    -
    -
    280
    Max. permissible total pressure, DHW (bar)
    10
    10
    10
    DHW temperature range (adjustable) (°C)
    15-65
    15-65
    15-65
    DHW capacity of heating water heat exchanger (litres)
    1.3
    1.3
    1.3
    Nominal capacity of the cylinder with internal indirect coil / equivalent nominal capacity (litres)
    145
    145
    145
    Spec. water throughput “D” at ΔT = 30 K (l/min)
    19.7
    21.4
    21.7
    Continuous DHW output to DIN 4708 (l/h (kW))
    324 (13.6)
    555 (22.6)
    612 (25)
    Performance factor to DIN 4708 (NL)
    1.7
    2
    2.2
    DHW output (l/10 min)
    162
    176
    182
    Standby heat loss to EN 12897 (kWh/24 h)
    1.47
    1.47
    1.47
    Corrosion protection, DHW heat exchanger / cylinder
    Stainless steel / two-layer enamel coating to DIN 4753
    Stainless steel / two-layer enamel coating to DIN 4753
    Stainless steel / two-layer enamel coating to DIN 4753
    Expansion vessel, total capacity (Litre)
    10
    10
    10
    Expansion vessel, pre-charge pressure (bar)
    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
    Flue gas temperature 80/60-50/30 at Qmin (°C)
    30-25
    30-25
    33-27
    Flue gas mass flow
    at Qmax (g/s)
    6.2
    8.8/10.7
    10.9/13.0
    at Qmin (g/s)
    0.9
    1.8
    2.3
    Available gas fan draught
    at Qmax (Pa)
    90
    90
    90
    at Qmin (Pa)
    12
    12
    12
    Flue gas category
    G52
    G52
    G52
    NOx class
    5
    5
    5
    Amount of condensate at 50/30°C (l/h)
    approx. 1.4
    approx. 2.0
    approx. 2.4
    Condensate pH value
    approx. 4.0
    approx. 4.0
    approx. 4.0
    Power consumption on standby (W)
    3
    3
    3
    Maximum power consumption (W)
    17-59/45
    17-51/63
    17-62/88
    IP rating (IP)
    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
    Weights
    Total weight (kg)
    160 (35 + 125)
    160 (35 + 125)
    160 (35 + 125)
    Installation weight (filled with water) (kg)
    583
    583
    583
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