Wall mounted gas condensing boiler

Benefit from the highest heating standards that condensing technology has to offer.

Highly efficient and advanced aptly describe the condensing technology offered by the CGB-2 from WOLF. This system makes optimum use of gas as an energy source; even the residual energy contained in the flue gas is reused through a heat recovery process. This is good for the environment, saves valuable energy and provides you with optimum heating convenience throughout the year.

The CGB-2 is ideal for detached houses and apartment blocks. It has a compact, space saving design and is mounted on the wall. The boiler is compatible with the control system from the WOLF product range and can be operated conveniently by smartphone.

  • Short Info
  • Specification

Energy efficient condensing technology for the highest level of heating convenience.

The CGB-2 wall mounted gas condensing boiler provides the most advanced heating technology to supply your home efficiently with heat. The CGB-2 is ideal for detached houses and apartment blocks; for new build or modernisation projects. You can operate and monitor the boiler with the WOLF control system or directly using your smartphone. By the way, if you need large quantities of hot water for yourself and your family, simply supplement the CGB-2 with a WOLF cylinder.

• Longer boiler service life and low fuel consumption thanks to a variable modulating output from as little as 1.8 kW

• Operates very efficiently with a standard seasonal efficiency [to DIN] of 110 %, i.e. not only is optimum use made of the fuel, but the residual energy contained in the flue gas is also reused

• Protects the environment due to extremely low emissions

• Simple and intuitive to operate via the BM-2 programming unit or Smartset app

• Easy to service: a straightforward and time saving service for the contractor reduces your maintenance costs

• Quiet operation thanks to special insulation inside the casing

Model / Performance
  • CGB-2-14
  • CGB-2-20
  • CGB-2-24
Please choose model
Wall mounted gas condensing boiler CGB-2
Model type CGB-2-14 CGB-2-20 CGB-2-24


max. 14kWmax.19kW max.24kW


Condensing x x x
Conventional - - -

Combination with

Heat pump - - -
Solar - - -
Mechanical ventilation- - -

DHW heating

Combi, integ. Instantaneous water heating - - -
integr. water cylinder - - -
ext. water cylinder x x x
DHW power output (l/Min) - - -
Memory size (equivalent) - - -

Modulation range 50/30°

2,1 - 15,24,4 - 20,4 5,6 - 25,8

Energy efficiency class

central heating A A A
DHW heating - - -

General info

Heating output (rated heat input)

Heating mode in (kW) 14 19 24
DHW heating in (kW) - 13,5kW 22,2kW

Efficiency (standard seasonal efficiency)

at 40/30° (Hi/Hs) in % 110/99 110/99 110/99
at 75/60° (Hi/Hs) in % 107/96 107/96 107/96

Dimensions / weight

Height (mm) 790 790 790
Width (mm) 440 440 440
Depth (mm) 378 378 378
Total weight (kg) 33 33/35 33/35

Noise level

max. dB47 48 49

Power consumption 

Standby (W) 3 3 3
max. heating/ DHW (W) 93 63 88

WOLF Smart SetReady

x x x

wiButler ready

x x x

Cosy Warmth
Whenever you need it

The CGB-2 wall mounted gas condensing boiler provides the most advanced heating technology for efficient heat generation.

WOLF wall mounted condensing boilers meet your individual requirements and supply you with cosy warmth throughout the year. Whilst you are relaxing at home for example, the CGB-2 is quietly working away, reliably and efficiently, thanks to advanced technology and good insulation. Furthermore, the boiler can be conveniently operated via our smartphone app.

Whether you're looking at heating, ventilation or cooling

Whether you're looking at heating, ventilation or cooling – at WOLF we are only satisfied when all these elements come together to provide you with an indoor environment where you can truly relax. We want technology to fit around you, not the other way round.
And because your requirements may change over time, we offer you full control of your heating system, DHW temperature and air change rates with our user friendly devices, intuitive apps, and SmartHome enabled programming units –so your living zone is also your comfort zone.


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When it comes to building services, if you invest in quality, you need to be confident that it's for the long term. Find out here how to get our 5 year system guarantee and what requirements need to be met.

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