Round surface makes sense. 118 degrees on a cloudy day at the tank. Not bad (plenty hot if a good size tank). As long as snow drips off it, probably good in the winter too.

Reason I asked about the roof was leaks and hurricanes for me. We get those and a hurricane would catch it. They can break a stop sign post. It is amazing the power they have.

Great project Shane. I will let you work out the bugs and bother you for getting one going for me later hahahaha.. We get nothing but hot here (10 month or more of the year and sun all the time).