Steve, it depends on how thick the screed is. I do not put tubing under it at all but if it is in a concrete slab of 3 or 4" the heat would migrate over regardless. If the screed is 1.5" (for example) on an over pour on a wood floor, there won't be as much bleeding of heat to affect the fridge.
Under a wood burner, I would expect some transfer as the temps are higher. It isn't enough to worry about.
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