The water in the closed loop system has the anti freeze in it. It circulates out in the ground loop and back to the heating unit for as you say the "conversion". To make it work for an under floor system, you need a different heating unit to heat the water that would be in the tubes under the floor. A little different set up than say a forced air unit but the same principle. Most newer forced air units have a thing called a "de-superheater" in them. It sends warmed water to your hot water heater. This circuit takes the actual cold water from your home water system and circulates it through the geo unit to get it warmed and then sends it to your water heater. Basically how the in floor system works. One closed loop circuit takes the water out to the outside ground to pick up the ground heat and the other circuit takes the heated indoor water and circulates it under the floor. They never intermingle. If properly protected with anitfreeze the ground loops should never freeze. Same for the in floor loops. The circuit for the hot water heater does not contain antifreeze as this is the same water as you would use for your house. If that freezes, you will have a lot of other freeze points also.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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