HDG F20-50

With complete operation from the front and the largest filling opening of comparable boilers on the market, the HDG F20-50 offers maximum convenience.

Log wood
Wood chips
Power levels: 20 kW, 25 kW, 30 kW, 40 kW, 50 kW
  • Inside view of the boiler













    1 - HDG Control
    2 - Enormous filling opening
    3 - Large fuel chamber
    4 - Low filling edge
    5 - Primary and secondary air
    6 - Integrated ash pan
    7 - Modular combustion chamber
    8 - Solid cast burner nozzle
    9 - Edged panels
    10 - Cleaning system as standard
    11 - Flue gas damper
    12 - Lambda sensor
  • Technical data


    HDG F20

    HDG F25

    HDG F30

    HDG F40

    HDG F50

    Nominal thermal power (kW) 20 25 30 40 50
    Fuel chamber capacity (l) 155 155 155 205 205
    Fuel chamber depth (mm) 570 570 570 570 570
    Required auxiliary energy (W) 78 82 85 63 63
    Diameter of the flue gas pipe connection (mm)
    150 150 150 150 150
    Flue draught requirement (Pa) 10 10 10 10 10

    Dimensions and weight


    HDG F20

    HDG F25

    HDG F30

    HDG F40

    HDG F50

    Height of the boiler (mm) 1590 1590 1590 1650 1650
    Width of the boiler (mm) 660 660 660 760 760
    Depth without attachments (mm) 1050 1050 1050 1100 1100
    Total weight (kg) 670 670 670 830 830

    Energy label


    HDG F20

    HDG F25

    HDG F30

    HDG F40

    HDG F50

    Boiler energy efficiency class
    A+ A+ A+ A+ A+
    Boiler + controller energy efficiency class (class VI)
    A++ A++ A+ A++ A++
  • 3D view

Technology makes the difference

Convenience redefined

During the development of the HDG F20-50, the focus was on one thing above all: maximum convenience! For this reason, the filling opening, for example, is uncompromisingly large, making refuelling child's play. Or the flue gas flap, which not only eliminates the need for a heating door, but also ensures clean and odourless conditions in the boiler room.

These and many other clever details make the HDG F20-50 one of the most convenient log wood boilers on the market.

Sensor-controlled combustion

The flue gas temperature sensor and lambda sensor provide the reference variables for combustion. This means the required combustion air can be continuously regulated via the actuators for primary and secondary air. The result is the lowest possible emissions and low wood consumption.

Anti-cavity fire function

The edged panels in the combustion chamber ensure that the fuel slides evenly and thus reliably prevent fires in the cavity. This guarantees clean combustion without smoke.

New: Filling door with 110 degree opening angle for particularly easy and clean refuelling.

Constantly high efficiency

With the help of the integrated cleaning turbulators or the HDG automatic cleaning system (on request), the heat exchanger surface areas are permanently freed from dust and ash. The result is permanently high efficiency and low fuel consumption 

Experience greater convenience

Practical convenience highlights, such as the optional HDG automatic ignition system for automatic and on-demand ignition, the practical ash pan for convenient ash removal and easily accessible cleaning openings at the front, make the HDG F20-50 the king of convenience. 

Flexible and space-saving

Thanks to the exchangeable door hinge and particularly compact design, the HDG F20-50 fits in almost every boiler room. The separately supplied cladding can be fitted without tools.

Two sizes – one concept

Whether with 20, 25, 30 kW or in the larger expansion stage with 40 or 50 kW output: In every size, the HDG F offers everything you can expect from a contemporary log wood boiler in terms of convenience, efficiency and durability – and more!

Der HDG F20-50 im Video

Erfahren Sie, wie einfach das Heizen mit dem HDG ist und erleben Sie den Komfortablen unter den Scheitholzkessel im Einsatz bei unseren Kunden.

Please to watch this YouTube video.
Please to watch this YouTube video.

Absolute control

Perfectly regulated with the HDG Control

The new HDG Control is the intelligent control centre for your entire heating system. Whether on the large touchscreen on the boiler or via the app: With HDG Control, you always have absolute control over your heating system.

HDG Control Systemregler
  • Control of combustion and output
  • Control of external heat sources
  • Integration of solar thermal systems, accumulators, heating circuits, mains pumps
  • Domestic hot water preparation, etc.
  • Intelligent follow-up management: Refuel the right amount at the right time
  • Ignite from anywhere with HDG remote ignition via computer, tablet & smartphone
  • "The large filling opening – even compared to other boilers on the market – is what excited us about the HDG F."

    Hofbauer family