The core activity of Marra Haustechnik GmbH is the planning, installation, maintenance and repair of building technology systems, particularly in the areas of: Sanitary technology, Heating technology (including heat pumps, gas heating, oil heating, wood heating and ice storage), Ventilation technology (including comfort ventilation and exhaust systems), Alternative energies (including solar thermal energy), and Renovation and conversion of building technology installations. The company offers these services to both private households and large-scale properties.