Takes me back to my 1970s Friends of the Earth days, when, as well as collecting rainwater, we used bathwater to flush the toilet, and one of our number installed black painted radiators on his roof to provide slightly warm water out of a third tap installed in his kitchen sink! He also had a wind generator in his garden that charged car batteries that lit 12v bulbs dotted round the house, until the council said it was dangerous and banned it. It was a disappointment to us all when, in the end, renewable wind and solar ended up being provided by the same big utilities as we'd all been trying to get away from.
Peter Evans ● 333d