The potting bench with an experimental solar hot water system. I'm playing around with it right now, using an old hose on the garage roof at the collector. I plan on adding more hose, hopefully black, if I can find it to increase the amount of water heated. It actually works pretty well, even in the filtered sun. The tap water is really cold, so any increase in temperature is really nice. I think that this summer the water will get really hot...hopefully.