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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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