> Besides which, getting the HOT water to come DOWN off the roof to the
 > storage tank is a major pain.  All my really HOT water goes back UP there.
You need to get a lot more sophisticated with your solar water heater, Elvis. 
Gonna need a pump and a valve or 2, thermstat, etc. Nothing real complicated, 
but more'n what you have now.
 
I do believe that it'll be worth the effort, though.
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