I had a look at it and they don't tell you any technical details. While the whole thing looks cool, wind turbines are usually not installed on the roof for a good reason, and the mast is very low.
I have my doubts that any water reaches the tank underneath, in a drizzle maybe but not a downpour. It seems that everything is photoshopped and that there is no funcitional protype.
What is done with the waste water? Which type of toilet is built in? Why
should it be any more enviro than a campervan with some
solar panels?