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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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