We are heating our rooms with a renewable energy source. We have a geothermal Probe.
A geothermal probe is large pipe which goes under the earth. We take the heat out of the inner of our earth.
How does it work?
We are putting cold water into the pipe, the water goes trough the whole pipe and gets heated up at the bottom of the pipe trough the geothermal. The Water circulates through this pipe and so we can heaten our house for free an unlimited.
I couldnt take a picture of our geothermal probe because it is hidden under the floor.