When we started to build the communal house we decided that it should be heated by geothermal heating. This vas the first house to be heated like that in the village, but instead of just making a system for that one house, we decided to make a much bigger system, thus enable more houses to join.
All 7 houses in the housing group are Bifrost are build to be heated exclusively by geothermal heating, and more and more houses get connected.
How Does It Work?
Geothermal heating has the advantage over for instance wood heating that it is practically maintenance free, and runs by itself. The disadvantage is that it uses electricity, about a quarter of what it produces. But if that electricity is co2 neutral, for instance from a windmill, it is in effect a sustainable source of heat.
In short it works by absorbing the heat from the ground via very long tubes dug down approximately 1 meter into the ground. These are filled with water and an anti freeze spirit. This relatively low heat is then boosted to 30- 40 degrees, this is what uses the electricity, and used for heating in floors and radiators, and hot tap water.