Particularly small and quiet condensate pump for combining with environmentally-friendly condensing heaters. Compact construction and quiet operation allow the condensate pump to be installed in narrow corners, installation cupboards or underneath an installed heating device, even in the living area. A specially developed docking system allows the pump to be attached to the wall in several positions, offering unique flexibility of installation. Through the most extensive avoidance of moving parts and the selection of electronic monitoring of the water level, this pump has reduced maintenance costs and provides a high degree of safety when running.