Just received information that they now see the solar solution as problematic because the roof only has a 15° pitch. The collectors would have to be angled again, so they couldn’t be installed flush. They think it doesn’t look good visually, and last week they had a customer with a flat roof where such an installation was damaged by a storm. They then wanted to offer a tube solution, which would only be feasible with gravel. I said that won’t work because our roof needs roof tiles; it’s not a flat roof that gets covered with gravel. Now they are thinking it over and want to discuss alternatives. Maybe they still want to steer me toward a brine heat pump. I need to see if I can find pictures of solar systems with a 15° hipped roof. Before it becomes a technical or visual complete disaster, that would of course also be seriously considered.