The Household Heating Unit
The heating system enters each house via two lines--one for hot water coming in and one for waste water going out. This image shows the small, wall-mounted unit that controls the heat for each household. As the villagers, not to mention Gottingen academics, are proud to demonstrate, there is no need for large boilers and furnaces that dominate space in most basements (and burn oodles of imported and unsustainable fuels).
Image: Christian Muhlhausen