Correct. It's a closed system containing an anti freeze solution that runs through coils in one of the tanks. There's a second set of coils,seven meters long,that runs cold water in,hot water out the other end of it for the domestic hot water. The actual water in the tanks circulates through the boiler and the heating system in the house. There's a valve down toward the lower left of the schematic that Thoger says is kind of key to the whole thing. I guess it either sends the water through the boiler or through the radiators and in floor heating if the boiler isn't burning.
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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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