Inter Press Service: Whenever hot water from the kitchen tap or the bathroom shower goes down the plughole, a substantial amount of heat energy goes with it. In some German buildings this is being recovered and used to heat buildings in the winter and run air conditioning systems in the summer, representing a real energy-saver.
The energy, recovery of which allows reduction of fossil fuel consumption and greenhouse gas emissions, flows in the drains. That is precisely where the city government of Frth, in the southeastern...