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How about this new product?

<a href="http://www.us.kohler.com/us/catalog/productDetails.jsp?productNumber=1954">http://www.us.kohler.com/us/catalog/productDetails.jsp?productNumber=1954</a>

Click on the yellow movie icon.

I picked up a couple before they go viral.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab