Which diff thermostat model did you order?

"Gary" wrote in message
...
My differential controller has not arrived yet, so I was just
turning the pump
on when the sun got on the collector and off in late afternoon --
I'm sure the
controller will be better. I was also fooling around with things
all day, and
had the tank cover off part of the time. But, it went from about
80F up to 143F
the first sunny day. It lost about 5F overnight (something I need
to improve a
lot). The next day was also sunny, and it went up to 175F by the
end of that
day. The slope of the tank temperature plot looks like it would
have kept going
over 175F had the sun not gone away -- i.e. the max temperature
appears to be
somewhat greater than 175F. I plan to limit it to around 170F for
the sake of
the EPDM liner.
Gary

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"Build It Yourself" Solar Projects