The core activity of U. Aerne, Sanitär Heizung, encompasses the planning, installation, maintenance, and repair of sanitary facilities, heating systems, industrial pipes, and solar systems. This includes, in particular: Sanitary installations in new buildings and renovations; Heating systems, including boiler replacements and system changes from oil heating to heat pumps; Bathroom renovations; Repair services for sanitary facilities and heating systems; Boiler descaling and pipe cleaning; Core drilling in concrete and flushing of piping systems; Installation and maintenance of solar systems and heat pumps; Energy consulting and optimization, including the use of thermal imaging cameras for leak detection and energy loss analysis.