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I think the heat transfer ratings are typically stated to be around 50 to 60% for 6' units and around 30% for 3' units. In terms of costs for DIY there are 3" copper transitions at each end to whatever the drains are now, plus piping the water to and from the drain. The payback is probably much longer, but the simple mechanical beauty and the expected long life of it adds a value beyond dollars. I have space for a 3'er and want to use one when I redo the drains for the bathroom.
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