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So I have radiant heat installed under my tile floor in a slab all in all working pretty nice. But for some reason I have a cold spot here and there . The returns on the manifold don't seem to be as hot as the feeds . I have access to a thermal imaging camera and will post the pics here I feel like if the water was circulating more or for a longer amount of time it would probably even out. There is a tekmar thermostat with floor sensor controlling this floor. In the last picture you can see the cold spot