On 09/01/2019 09:09, charles wrote:
In article ,
Brian Gaff wrote:
So how is this any different to the hot water heaters for roofs that many
already have. A friend of mine has one and it seems to save money, but of
course there is the capital outlay, the need to keep them clean and any
possible issues when they go wrong.

Brian

On some newish houses in this village, hot water creating panel were fitted
on the roofs. But they hadn'r been fitted properly. When it snowed all the
panels were completely clear - the snow melted off them!


Maybe that is what you want, once they are clear of snow they stand a
chance of picking up some solar heat. And presumably you don't want them
freezing. I wonder if a smart heat pump system would manage this
automatically?