I thought this was pretty clever when I spotted it a while back passing a farm on the coast. They've put a row of solar water panels on an outbuilding roof. Nice south-facing roof too and low enough to make installation and maintenance a breeze. The only wonder is how the water is being piped from the outbuilding to the main house (if it even is). There's a fair loss in heat over even short distances which is why it is always recommended that solar panels are placed as close to the hot water tank as possible.
Still a great installation.