Together with a project partner from the field of food technology, this project could be implemented. The waste heat from the cooling is generated at approx. 40°C and is stored in a stratified storage tank. A water-to-water heat pump - designed as a high-temperature heat pump - raises this temperature to a level of up to 70°C. The heat is then stored in a stratified storage tank. This heat is then stored in a 4,000 L stratified storage tank together with the heat generated by the heat recovery from the hot exhaust air of the ovens and consumed as required in the bakery. The heating network also includes a residential building with its own smaller stratified storage tank and an oil heating system as a backup or for any peak loads. In the past, the bakery needed 30,000 litres of heating oil and was able to reduce heating costs by approx. 80% through these measures.