-> You need to get a lot more sophisticated with your solar water
-> heater, Elvis.
I'd about figgered that out.  I get a LOT of heat gain, but don't get
to KEEP much of it.
-> I do believe that it'll be worth the effort, though.
I'm convinced of it.  I've just been too dang busy to 'tinker' with it
much.  Started work on the electronics of the Delta T sensor, but
immediately ran into resistance problems with my stock of thermistors.
 ^..^
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