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Wall mounted gas condensing combi boiler
CGB-2(K)

ComfortLine wall mounted gas condensing combi boiler
Model / Performance
  • CGB-2-14
  • CGB-2-20
  • CGB-2-24
  • CGB-2K-20
  • CGB-2K-24
  • KEY FACTS
  • Specification
  • Downloads
  • Wall mounted gas condensing boilers, sealed combustion chamber, for open flue or room sealed operation
  • High standard seasonal efficiency [to DIN] up to 110 % (net cv) / 99 % (gross cv) for the best possible energy efficiency
  • 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 < 0.23) and 3-way valve as standard
  • WOLF "ALUPro" coated heating water heat exchanger
  • Efficient combustion technology with gas-adaptive, self-calibrating combustion controller that adjusts automatically to the gas quality (such as biogas)
  • Automatic CO2 settings with self-calibrating combustion air controller for extremely clean combustion
  • No overflow valve, no return temperature raising facility – for maximum utilisation of the condensing effect
  • Convenient access to all components for quick installation and easy operation and maintenance
  • Heating water heat exchanger can be pivoted under system pressure for maintenance without having to drain the heating water
technical drawing
Please choose model
Wall mounted gas condensing combi boiler CGB-2(K)
Type CGB-2-14 CGB-2-20 CGB-2-24 CGB-2-K-20 CGB-2-K-24

Energy efficiency class

Energy efficiency class, central heating   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 1) 23.8/27.1 1) 18.9/22.2 1) 23.8/27.1 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 2) 3.8/6.8 2) 4.8/6.8 2) 3.8/6.8 2) 4.8/6.8 2)
at 50/30 °C kW 2.1/5.4 2) 4.4/7.4 2) 5.6/7.4 2) 4.4/7.4 2) 5.6/7.4 2)
Lowest heat input (modulating) kW 1.9/4.9 2) 3.9/6.9 2) 4.9/6.9 2) 3.9/6.9 2) 4.9/6.9 2)
Heating flow connection G ¾" (DN 20) ¾" (DN 20) ¾" (DN 20) ¾" (DN 20) ¾" (DN 20)
Heating return connection G ¾" (DN 20) ¾" (DN 20) ¾" (DN 20) ¾" (DN 20) ¾" (DN 20)
Cold water connection/DHW circulation G ¾" ¾" ¾" ¾" ¾"
Cold water connection G ¾" ¾" ¾" ¾" ¾"
Gas connection R ½" ½" ½" ½" ½"
Air/flue pipe 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
Air/flue gas routing 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 supply details

           
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 [to DIN] 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. overall 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 overall pressure, DHW bar - - - 10 10
DHW temperature range (adjustable) °C - - - 45-65 45-65
"Hot water capacity of the heating water heat exchanger" l 1,3 1,3 1,3 1,3 1,3
Expansion vessel, total capacity l 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
Flue gas mass flow rate at Qmax g/s 6,2 8.8/10.7 1) 10.9/13.0 1) 8.8/10.7 1) 10.9/13.0 1)
Flue gas mass flow rate at Qmin g/s 0,9 1,8 2,3 1,8 2,3

Available gas fan draught

           
at Qmax Pa 125 135 180 135 180
at Qmin Pa 10 14 17 14 17
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 1) 17-51/63 1) 17-62/88 1) 17-51/63 1) 17-62/88 1)
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
Total weight kg 33 33 33 35 35
Wall mounted gas condensing combi boiler CGB-2(K)