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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