For most of us in Germany, Auerbach’s cellar (Auerbachs Keller) is associated with Faust; a tragedy by Johann Wolfgang Goethe. Many people know the scene where the depressed Faust was brought into Auerbach’s Keller directly after he sold his soul to the Devil. When they reach the Devil shows some magic tricks and teased drunken students to make Faust free from his unsatisfaction. Uncountable further famous visitors like Bishop Tutu, Bill Clinton and Queen Silvia of Sweden visited Auerbachs Keller to be entertained, too. Since the opening of the pub these famous people plus 100 million guests made it to one of the 5 most famous in the world.

Only a few know of another regular at Auerbachs Keller. This regular is hidden in the plant room. In fact it is the DK heat recovery system!

Hardworking and tireless this system heats the potable water in an enamelled 750 litres storage tank with double walled heat exchangers. The heat recovery system was installed by The Friendly Ice Bear Company. Making use of the refrigeration equipment waste heat, is both effective and economic sense.

The busy staff gets through a large volume of warm water for dish washing and food preparation. For example 14.000 kg of red cabbage are handled in these 2 restaurants per year. The water consumption of the restaurants and the staff showers can fluctuate between 13 and 30 m³ each day.

The DK-Heat-Recovery uses the complete waste energy and provides 2 large horizontal tanks as a preheater to the main boiler, providing enormous efficiency

Each hour more than 400 litres of water can be preheated from 15 to 45°C using just 18 kW of free waste refrigeration energy. The daily amount of water heating is approximately 4,000 litres; and totalling at over 1.5 million litres per year. An enormous annual saving of 50,000 kWh is achieved for the client.

The long life time of the DK products is another advantage. In comparison to heat recoveries of DK that have worked more than 20 years the system at Auerbachs Keller has already worked tirelessly now for 9 years.

And in that time has notched up more than 14 million litres of hot water! Saved approximately 480.000 kWh respectively 52.000 m³ gas and has relieved the environment of 96.000 kg of harmful CO₂ emissions.

AND OF COURSE THE UNIT KEEPS RUNNING