In developed countries, many people take their habit of a daily shower for granted. But the energy that has to be used for this is considerable. A hot shower lasting eight minutes takes up about as much energy as would be needed to scale the Eiffel Tower in Paris 55 times! This is where the newly developed heat recovery system Joulia-inline comes into play. It uses the hot waste water that would have been wasted in the past to preheat the cold incoming water. This reduces the energy consumption that is needed for a hot shower by as much as 50%. To make it possible, a heat exchanger consisting of copper pipes just six centimetres wide is invisibly incorporated in the drainage channel of the shower. The practical advantages of the system come to expression both in the compact and sophisticated design, and in its being easy to access for cleaning purposes.