Typically a system would use an anti-freeze solution in the solar panel loop - see "sun in" "sun out" loop in the diagram. There are also drain back systems that can use water. The water is drained from the outside panels and plumbing in cold temperatures and no sun. The panels will provide hot water in cold weather as long as there is sun.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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