Yeah there isn't much challenge getting hot water out of a black hose in summer.....
Once you put it behind some glass in an insulated box, you can just collect and keep more hot water from the hose when its cooler outside. One bad thing about winding the hose up is that you can't do a drainback with it, so it kinda becomes a fair weather collector, but 9 months of freeish hot water is better than none....