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Old 08-04-20, 03:41 PM   #11
Lurking Renovator
Join Date: Jul 2020
Location: Virginia
Posts: 25
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I am absolutely interested. To be clear, I have no intention of running oil through the slab. I was going to use oil to go through the evacuated tube heater and into coils, inside the water tanks. My main concern was freezing at night, which is why I wanted oil not water. But pretty much everybody agrees this would be a bad idea, so I am leaning towards water and antifreeze.

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