Eco-House in Vilafranca del Penedès

Today we visited an ecological house here in Vilafranca.
The owners of that house are used to live from natural resources, e.g. you can find some suncollectors on the roof. They totally heat the water and produce electricity. They drink rainwater and they take a shower with that water, they have a "dry toilet" (it works without water) and they recycle their excrements and use them in the garden to fertilize their fruits and vegetables.

They have 2 underground containers that collect all the water falling from the sky in their garden.
The walls are very thick and in consequence of that the heat isn't as intensive as it is outside in the heat of the sun.
So it was very interesting to get new knowledge about eco-houses and how they work.