• That’s HDG

    40 years of innovation

    Think innovatively – act sustainably

    For more than 40 years, we have combined innovative thinking with sustainable action and have been committed to climate-friendly heat generation.

    We are committed to sustainability not only in our products, but we also take responsibility in all areas – people, society, economy, environment and climate.

    Today, more than 200 employees live this philosophy. As a Bavarian family business, we are proud to produce in the region and to therefore be able to offer our prospective customers flexible solutions that are "Made in Germany".

    This has made us the expert for wood heating systems from Germany.



    The HDG management trio (from left): Managing Director Martin Ecker, shareholder Eva Ackermann and Managing Director Harald Benkert.

    Our HDG philosophy in action

    For more than 40 years, we have been developing, producing and selling our (central-heating) boilers according to the five principles of our HDG corporate philosophy – because what HDG makes should have long-term value and durability. This applies not only to the products, but also to loyal employees, to research and development, and to fair cooperation with all partners.

    This inspires our customers and makes us more valuable.

    Gemeinwohl Ökonomie

    Economy for the common good - an economic model with a future.

    Value Tree

    From a family business
    to a modern family company

    The company's founder Karl Ackermann already knew how to manufacture heating systems that were popular due to their high quality and robustness. As a modern family company, we still rely on the values and ideals of the family business from which we are descended. 

    This is the basis for HDG's success – then and now.


    • 1922

      The history of HDG began in 1922 when Josef Ackermann and Stefan Laxhuber founded a company in Massing for locksmith and plumbing work, as well as the construction of wind wells.

    • 1936

      The company moves into its first workshop on the market square in Massing.

    • 1970

      (Central-heating) boilers for oil, gas and solid fuels are produced for the first time under the name ACKMATHERM.

    • 1977

      The unique patent for smokeless combustion marks the birth of the HDG (central-heating) boilers – the legendary "Bavaria" is developed to series maturity.

    • 1978

      HDG Kessel- und Apparatebau GmbH is founded. In order to be able to manufacture the climate-friendly wood heaters, a 2600 sqm production hall is built.

    • 1990

      Eva Ackermann, the youngest daughter of the company founders Karl and Therese Ackermann, joins the company. The business economist therefore lays the foundation for the continuous modernisation of the company.

    • 1995

      HDG founder Karl Ackermann receives the Federal Cross of Merit, 1st class, for his achievements and services to the skilled trades.

    • 1996

      The HDG Euro celebrates its premiere and is awarded the Federal Innovation Prize the very next year. To this day, the Euro stands for HDG values in particular, such as quality, robustness and durability.

    • 1998

      The "HDG Compact" is launched – a fully automatic heating system for the combustion of wood chips and shavings. Like the HDG Euro, the "Compact" is also awarded the Federal Innovation Prize shortly after its market launch.

    • 2002

      The "Pelletmaster" is the first pellet boiler from HDG and it receives the iF Design Award in 2004. At the same time, exports are becoming increasingly important: The distribution network now includes almost all surrounding states in Germany.

    • 2005

      The groundbreaking ceremony for the construction of the new customer and administration centre as well as a new production and logistics hall takes place.

    • 2005

      Unfortunately, Karl Ackermann will not live to see the completion of the new customer centre. The "senior boss" dies unexpectedly, shortly after his 75th birthday.

    • 2008

      HDG celebrates its 30th anniversary at a big summer party. Numerous representatives from politics and business do the honours and ensure a successful evening with moving speeches and emotional moments.

    • 2011

      The HDG K series (pictured right) replaces the "Pelletmaster". At the same time, the "HDG M300-400", a wood-chip and pellet boiler, is launched on the market, rounding off the output range.

    • 2014

      "Senior boss" Therese Ackermann dies unexpectedly. The HDG staff has to say goodbye to the company's co-founder.

    • 2014

      Construction of the new HDG logistics centre, with a footprint of around 1800 square metres, begins. With an investment volume of €1.6 million, the building is a real commitment to production in the region and to the Massing site.

    • 2015

      In the spring, the HDG Compact 25-80 and the HDG F log wood boiler are two products to receive the coveted iF Design Award. Both boilers are representatives of the new design line that HDG developed together with product designer Stefan Otzelberger.

    • 2015

      Also in 2015, the previous distribution partner in Austria, Ligno Heizsysteme, and HDG combine their expertise. The two specialists in the field of wood-fired central heating boilers therefore merge their competences in a final consistent step.

    • 2020

      The HDG log wood boilers are awarded the Plus-X Award. The product range around HDG Euro, HDG F and HDG FK Hybrid convinced the jury in the areas of "high quality", functionality and ease of use.

    • 2021

      Digitalisation is advancing with giant strides: In 2021, the new myHDG app is released. With it, users now have even easier access to their HDG wood heating system. The app is available for both Android and iOS devices.


    Competence leader and initiator

    Robustness, convenient operation, reliability and the integration of new technologies characterise all HDG products. That is our performance promise. For this reason, we have been driving the development of wood heating systems since the early days, always orienting ourselves to the needs of the market and customers.

    Furthermore, research and development at HDG also means daring to look beyond the end of one's nose – be it testing alternative biogenic fuels apart from wood or also the continuous optimisation of efficiency through innovative approaches in boiler technology.

    As a partner of numerous institutes, we rely on cooperation and a lived exchange of experience and ideas, because we are convinced: The turnaround from fossil fuels to a truly sustainable heat supply can only succeed if we work together.

    Technology and design –
    simply excellent!

    The expert for wood heating systems from Germany

    The result of our development work: The HDG (central-heating) boilers comply with the strictest emission limits and are characterised by particularly high efficiencies. For this reason, they are also specifically subsidised by the state and have already received many awards for technology and design.

    Awards in Germany: