Hi everybody,
this is my first post at Permies.com. I live in Italy and I own a little farm where I would like to start permaculture. Few months ago I build my first prototype of RMH following videos and instructions I bought here. I'm very happy of it... but this will be a matter of my second post.

What I would like to tell you is my experience on a solar thermal collector which was designed by my father, a retired researcher. He called its idea ARETHA, which means Air Exchange Thermal Assembly. Everybody can build its own ARETHA using or better reusing, low cost materials. Moreover ARETHA is a light panel because it does not contains water but only air and a used (or a new if you prefer) radiator.
My father at the beginning thought ARETHA for the third world, for example hospitals or poor regions. But this panel can be used also in our world.
In these days four students of Milano University are writing the graduation (degree) thesis about ARETHA.

Below a video where is described the ARETHA building process in my farm.
Feel free to comment ask and discuss about this idea.
Regards and season greetings.
Roberto